.TH ACCEL-PPP.CONF 5 "23 August 2011"
.SH NAME
.B accel-ppp.conf
- ACCEL-PPP VPN daemon configuration
.SH DESCRIPTION
.BR accel-pppd (8)
reads options from this file, usually
.IR /etc/accel-ppp.conf
.TP
Configuration file consists of sections in form:
.TP
[section1]
.br
name1=val1
.br
name2=val2
.br
name3
.TP
[section2]
.br
 ....
.br
.SH SECTIONS
.SH [modules]
contains list of modules to load
.TP
.BI log_file
This is logging target which logs messages to files. It support per-session/per-user features.
.TP
.BI log_syslog
This is logging target which logs messages to syslog.
.TP
.BI log_tcp
This is logging target which logs messages over TCP/IP.
.TP
.BI log_pgsql
This is logging target which logs messages to PostgreSQL.
.TP
.BI pptp
.br
PPTP controlling connection handling module.
.TP
.BI pppoe
.br
PPPoE discovery stage handling module.
.TP
.BI sstp
.br
SSTP controlling connection handling module.
.TP
.BI auth_pap
PAP authentication module.
.TP
.BI auth_chap_md5
CHAP (md5) authentication module.
.TP
.BI auth_mschap_v1
Microsoft CHAP (version 1) authentication module.
.TP
.BI auth_mschap_v2
Microsoft CHAP (version 2) authentication module.
.TP
.BI radius
.br
RADIUS interaction module.
.TP
.BI ippool
.br
IPv4 address assigning module.
.TP
.BI ipv6pool
.br
IPv6 address assigning module.
.TP
.BI sigchld
Helper module to manage child processes, required by pppd_compat
.TP
.BI pppd_compat
This module starts pppd compatible ip-up/ip-down scripts and ip-change to handle RADIUS CoA request.
.TP
.BI connlimit
This module limits connection rate from single source.
.SH [core]
Configuration of core module
.TP
.BI "log-error=" path
Path to file for core module error logging.
.TP
.BI "thread-count=" n
number of working threads, optimal - number of processors/cores
.SH [common]
Contains common params for all connection types
.TP
.BI "single-session=" replace|deny
Specifies whether accel-ppp should control sessions count.
.br
If this option is absent session count control is turned off.
.br
If this option is 
.B replace
then accel-ppp will terminate first session when second is authorized.
.br
If this option is 
.B deny
then accel-ppp will deny second session authorization.
.TP
.BI "single-session-ignore-case=" 0|1
Specifies whether accel-ppp should ignore the case when comparing username within single-session validation (default 0).
.TP
.BI "sid-case=" upper|lower
Specifies in which case generate session identifier (default lower).
.TP
.BI "sid-source=" urandom|seq
Specifies method assign session id (default urandom).
.br
.B urandom
Assign session id by random method
.br
.B seq
Assign session id by sequence method
.TP
.BI "seq-file=" path
Path to file for sessions sequence number. Start sequence number may be set there (default /var/lib/accel-ppp/seq).
.TP
.BI "max-sessions=" n
Specifies maximum concurrent sessions which server may processed (default 0, disabled)
.TP
.BI "max-starting=" n
Specifies maximum concurrent session attempts which server may processed (default 0, disabled)
.TP
.BI "check-ip=" 0|1
Specifies whether accel-ppp should check if IP already assigned to other client interface (default 0).
.TP
.BI "nl-snd-buffer=" n
Specifies netlink maximum send buffer size (SO_SNDBUF option) (default 32768).
.TP
.BI "nl-rcv-buffer=" n
Specifies netlink maximum receive buffer size (SO_RCVBUF option) (default 1048576).
.SH [ppp]
.br
PPP module configuration.
.TP
.BI "verbose=" n
If n is not zero ppp module will produce verbose logging.
.TP
.BI "min-mtu=" n
Minimum acceptable MTU. If client will try to negotiate less then specified MTU then it will be NAKed or disconnected if rejects greater MTU.
.TP
.BI "mtu=" n
MTU which will be negotiated if client's MRU will be not acceptable.
.TP
.BI "mru=" n
Prefered MRU.
.TP
.BI "accomp=" allow|deny|n
Address/Control compression negotiation.
.br
.B allow
- prefere in send and don't deny in receive directions
.br
.B deny
- disable in both directions, default behavior
.TP
.BI "pcomp=" allow|deny|n
Protocol field compression negotiation.
.br
.B allow
- prefere in send and don't deny in receive directions
.br
.B deny
- disable in both directions, default behavior
.TP
.BI "ccp=" n
Disable CCP negotiation if this parameter is zero.
.TP
.BI "mppe=" require|prefer|deny
Specifies mppe negotiation preference.
.br
.B require
- ask client for mppe, if it rejects drop connection
.br
.B prefer
- ask client for mppe, if it rejects don't fail.
.br
.B deny
- deny mppe.
.br
Default behavior - don't ask client for mppe, but allow it if client wants.
Please note that RADIUS may override this option by MS-MPPE-Encryption-Policy attribute.
.TP
.BI "ipv4=" deny|allow|prefer|require
Specify IPv4 (IPCP) negotiation algorithm:
.br
.B deny
- don't negotiate IPv4.
.br
.B allow
- negotiate IPv4 only if client requests.
.br
.B prefer
- ask client for IPv4 negotiation, don't fail if he rejects.
.br
.B require
- require IPv4 negotiation.
.TP
.BI "ipv6=" deny|allow|prefer|require
Parameters are same as above.
.TP
.BI "ipv6-intf-id=" x:x:x:x|random
Specify fixed or random interface identifier for IPv6.
.TP
.BI "ipv6-peer-intf-id=" x:x:x:x|random|ipv4|calling-sid
Specify peer interface identifier for IPv6.
.br
.B ipv4
- calculate interface identifier from IPv4 address, for example 192:168:0:1.
.br
.B calling-sid
- calculate interface identifier from Calling-Station-Id.
.TP
.BI "ipv6-accept-peer-intf-id=" 0|1
Specify whether to accept peer's interface identifier.
.TP
.BI "lcp-echo-interval=" n
If this option is given and greater than 0 then lcp module will send echo-request every 
.B n
seconds.
.TP
.BI "lcp-echo-failure=" n
Specifies maximum number of echo-requests may be sent without valid echo-reply, if exceeds connection will be terminated.
.TP
.BI "lcp-echo-timeout=" sec
Specifies timeout in seconds to wait for any peer activity. If this option specified it turns on adaptive lcp echo functionality and "lcp-echo-failure" is not used.
.TP
.BI "unit-cache=" n
Specifies number of interfaces to keep in cache. It means that don't destroy interface after corresponding session is destroyed, instead place it to cache and use it later for new sessions repeatedly.
This should reduce kernel-level interface creation/deletion rate lack.
.TP
.BI "unit-preallocate=" 0|1
If set to 1 then allocate ppp unit (interface) before authorization, so Nas-Port and Nas-Port-Id would be defined in Access-Request phase.
.SH [ipoe]
.TP
.BI "verbose=" n
If n is not zero ipoe module will produce verbose logging.
.TP
.BI "username=" ifname|lua:function
Specifies how to determine username of user.
.br
If username=
.B ifname
then interface name from which packet was arrived will be used as username.
.br
If username=
.B lua:username
then lua function with name
.B username
will be called to construct username from dhcp packet fields.
.TP
.BI "password=" username|csid|empty|<string>
Specifies how to generate password.
.br
If password=
.B username
then password will be same as username.
.br
If password=
.B empty
then password will be empty string.
.br
If password=
.B csid
then password will be same as Calling-Station-Id.
.br
Or you can specify fixed password in
.B <string>.
.TP
.BI "session-timeout=" n
Specifies max sessions time in seconds. After this time session will be terminated. May redefine with radius attribute Session-Timeout
.TP
.BI "idle-timeout=" n
Specifies timeout in seconds to wait for any packets from client, after this time session will terminated if client don`t send any packet. Often used with mode=L3.
.TP
.BI "lease-time=" n
Specifies lease time in seconds to be sent to dhcp client.
.TP
.BI "renew-time=" n
Specifies lease renew time (option 58) in seconds to be sent to dhcp client.
.TP
.BI "rebind-time=" n
Specifies lease rebind time (option 59) in seconds to be sent to dhcp client.
.TP
.BI "max-lease-time=" n
Specifies max lease time in seconds, after this time session will be terminated if client won't renew it.
.TP
.BI "unit-cache=" n
Specifies number of interfaces to keep in cache. It means that don't destroy interface after corresponding session is destroyed, instead place it to cache and use it later for new sessions repeatedly.
This should reduce kernel-level interface creation/deletion rate lack.
.TP
.BI "l4-redirect-table=" n
Specifies number of table. If L4-Redirect radius attribute is received and it's value is not 0 or '0' then accel-ppp will add following rule: ip rule add from client_ip table
.B n
.TP
.BI "l4-redirect-ipset=" name
Specifies name of ipset list. If L4-Redirect radius attribute is received and it's value is not 0 or '0' then accel-ppp will add client's ip to that ipset name.
.TP
.BI "l4-redirect-on-reject=" n
If specified then if radius rejects access 'ip rule add from ip_addr table l4-redirect-table' rule will be created for time
.B n
seconds.
.TP
.BI "l4-redirect-ip-pool=" name
If specified then if radius rejects access and session is DHCP then ip will be allocated from specified pool name.
.TP
.BI "gw-ip-address="x.x.x.x/mask
Specifies address to be used as server ip address if radius can assign only client address. In such case if client address is matched network and mask then specified address and mask will be used. You can specify multiple such options.
.TP
.BI "shared=" 0|1
Specifies default value for per-interface
.B shared
parameter.
.TP
.BI "mode=" L2|L3
Specifies default value for per-interface
.B mode
parameter.
.TP
.BI "start=" dhcpv4|up|auto
Specifies default value for per-interface
.B start
parameter.
.TP
.BI "ifcfg=" 0|1
Specifies default value for per-interface
.B ifcfg
parameter.
.TP
.BI "relay=" ipv4_address
Specifies default value for per-interface
.B relay
parameter.
.TP
.BI "proxy-arp=" n
Specifies default value for per-interface
.B proxy-arp
parameter.
.TP
.BI "weight=" n
Specifies global weight of this server (used for load balancing)
.TP
.BI "ip-unnumbered=" 0|1
Specifies default value for per-interface
.B ip-unnumbered
parameter.
.br
If ip-unnumbered=1 accel-ppp will always assign /32 mask.
.br
Default value is 1.
.TP
.BI "interface=" [re:]name[,mode=L2|L3][,shared=0|1][,start=dhcpv4|up|auto]
.BI "" [,range=x.x.x.x/mask][,ifcfg=0|1]
.BI "" [,relay=x.x.x.x]
.BI "" [,giaddr=x.x.x.x]
.BI "" [,src=x.x.x.x]
.BI "" [,proxy-arp=0|1|2]
.BI "" [,username=ifname|lua:function]
.BI "" [,ipv6=0|1]
.BI "" [,mtu=N]
.BI "" [,weight=N]
.BI "" [,ip-unnumbered=0|1]
.br
Specifies interface to listen dhcp or unclassified packets. You may specify multiple
.B interface
options.
.br
If
.B name
is prefixed with
.B re:
then
.B name
is treated as regular expression.
.br
The
.B mode
parameter specifies client connectivity mode. If mode=
.B L2
then it means that clients are on same network where interface is.
.B L3
means that client are behind some router.
.br
The
.B shared
parameter specifies where interface is shared by multiple users or it is vlan-per-user.
.br
The
.B start
parameter specifies which way session starts (up - unclassified packet).
.br
auto - means automatically start session with username = interface name. Use it with conjunction vlan_mon.
.br
The
.B range
parameter specifies local range of ip address to give to dhcp clients. First IP in range is router IP.
.br
The
.B ifcfg
parameter specifies whether accel-ppp should add router IP address and route to client to interface or it is explicitly configured.
.br
The
.B relay
parameter specifies DHCPv4 relay IP address to pass requests to. If specified 
.B giaddr
is also needed.
.br
The
.B giaddr
parameter specifies relay agent IP address.
.br
The
.B src
parameter specifies ip address to use as source when adding route to client.
.br
The
.B proxy-arp
parameter specifies whether accel-ppp should reply to arp requests.
.TP
.BI "local-net=" x.x.x.x/mask
Specifies networks from which packets will be treated as unclassified. You may specify multiple local-net options.
.TP
.BI "proto=" n
Specifies number of protocol to be used for inserted routes.
.TP
.BI "offer-delay=" delay[,delay1:count1[,delay2:count2[,...]]]
Specifies delays (also in condition of connection count) to send DHCPOFFER (ms).
Last delay in list may be -1 which means don't accept new connections.
List must to be sorted by count key.
.TP
.BI "offer-timeout=" n
Specified timeout waiting DHCP-Request from client in seconds (default 10).
.TP
.BI "vlan-mon=" [re:]name[,filter]
Starts vlan monitor on specified interface (requires ipoe kernel module).
.br
The
.B filter
parameter specifies list of vlans or ranges of vlans to monitor for and may be in following form:
.br
vlan-mon=eth1,2,5,10,20-30
.TP
.BI "vlan-timeout=" n
Specifies time of vlan inactivity before it will be removed (seconds).
.TP
.BI "vlan-name=" pattern
Specifies pattern of vlan interface name. Pattern may contain following macros:
.br
.B %I
- name of pattern interface.
.br
.B %N
- number of vlan.
.br
.B %P
- number of vlan of parent interface.
.br
By default vlan-name=%I.%N.
.TP
.BI "soft-terminate=" 0|1
Turns on soft terminate mode. Soft terminate means that session won't be terminated immediately, but when next lease renewal request will be received.
.TP
.BI "check-mac-change=" 0|1
If enabled accel-ppp will terminate session when detects change of mac address of client (by default it is enabled).
.TP
.BI "calling-sid=" mac|ip
Specifies value of Calling-Station-Id attribute.
.SH [dns]
.TP
.BI "dns1=" x.x.x.x
Specifies primary DNS to be sent to peer.
.TP
.BI "dns2=" x.x.x.x
Specifies secondary DNS to be sent to peer.
.SH [wins]
.TP
.BI "wins1=" x.x.x.x
Specifies primary NBNS to be sent to peer.
.TP
.BI "wins2=" x.x.x.x
Specifies secondary NBNS to be sent to peer.
.SH [ipv6-dns]
.TP
.BI "dns=" IPv6_address
Specifies IPv6 DNS to be sent to peer. You may specify up to 3 dns options.
.TP
.BI "dnssl=" name
Specify DNS Search List. You may specify multiple dns and dnssl options.
.SH [client-ip-range]
You have to explicitly specify range of ip address from which clients can connect to server in form:
.br
.B x.x.x.x/mask
(for example 10.0.0.0/8)
.br
.B x.x.x.x-y
(for example 10.0.0.1-254)
.SH [pptp]
.br
Configuration of PPTP module.
.TP
.BI "bind=" x.x.x.x
If this option is given then pptp server will bind to specified IP address.
.TP
.BI "port=" n
If this option is given then pptp server will bind to specified port.
.TP
.BI "verbose=" n
If this option is given and 
.B n
is greater of zero then pptp module will produce verbose logging.
.TP
.BI "echo-interval=" n
If this option is given and greater than zero then pptp module will send echo-request every 
.B n
seconds.
.TP
.BI "echo-failure=" n
Specifies maximum number of echo-requests may be sent without valid echo-reply, if exceeds connection will be terminated.
.TP
.BI "timeout=" n
Timeout waiting reply from client in seconds (default 5).
.TP
.BI "mppe=" deny|allow|prefer|require
.TP
.BI "ifname=" ifname
If this option is given ppp interface will be renamed using
.B ifname
as a template, i.e pptp%d => pptp0.
.TP
.BI "ppp-max-mtu=" n
Set the maximum MTU value that can be negotiated for PPP over PPTP
sessions. Default value is 1436.
.SH [pppoe]
.br
Configuration of PPPoE module.
.TP
.BI "interface=" [re:]ifname[,padi-limit=n]
Specifies interface name to listen/send discovery packets. You may specify multiple
.B interface
options. If
.B ifname
is prefixed with
.B re:
then ifname is considered as regular expression. Optional
.B padi-limit
parameter specifies limit of PADI packets to reply on this interface in 1 second period.
.TP
.BI "ac-name=" ac-name
Specifies AC-Name tag value. If absent tag will not be sent.
.TP
.BI "service-name=" service-name
Specifies Service-Name to respond. If absent any Service-Name is acceptable and client's Service-Name will be sent back.
.TP
.BI "accept-any-service=" n
If service-name specified still will answer with service names, but accepts any service name in PADR request. Useful 
for scenarios, where selection of PPPoE done by client, based on service names in PADO.
.TP
.BI "accept-blank-service=" n
Allow answering on blank Service-Name even if Service-Name configured.
Useful when needs to allow only Service-Names described in the config and also blank Service-Name.
.TP
.BI "pado-delay=" delay[,delay1:count1[,delay2:count2[,...]]]
Specifies delays (also in condition of connection count) to send PADO (ms).
Last delay in list may be -1 which means don't accept new connections.
List have to be sorted by count key.
.TP
.BI "mac-filter=" filename,type
Specifies mac-filter filename and type, type maybe 
.B allow
or
.B deny
.TP
.BI "called-sid=" ifname|mac|ifname:mac
Specifies how to represent Called-Station-ID.
.br
.B ifname 
- Called-Station-ID will contain name of interface accepted request.
.br
.B mac
- Called-Station-ID will contain mac address of interface accepted request.
.br
.B ifname:mac
- Called-Station-Id will contain both name and mac of interface.
.TP
.BI "verbose=" n
If this option is given and 
.B n
is greater of zero then pppoe module will produce verbose logging.
.TP
.BI "tr101=" 0|1
Specifies whether to handle TR101 tags.
.TP
.BI "padi-limit=" n
Specifies overall limit of PADI packets to reply in 1 second period (default 0 - unlimited). Rate of per-mac PADI packets is limited to no more than 1 packet per second.
.TP
.BI "mppe=" deny|allow|prefer|require
.TP
.BI "ifname=" ifname
If this option is given ppp interface will be renamed using
.B ifname
as a template, i.e pppoe%d => pppoe0.
.SH [l2tp]
.br
Configuration of L2TP module.
.TP
.BI "bind=" x.x.x.x
Specifies IP address to bind.
.TP
.BI "port=" n
Specifies port to bind.
.TP
.BI "host-name=" string
This name will be sent to clients in Host-Name attribute.
.TP
.BI "hello-interval=" n
Specifies interval (in seconds) to send Hello control message. Its used for keep alive connection. If peer will not respond to Hello connection will be terminated.
.TP
.BI "recv-window=" n
Set the size of the local receive window. Only received messages whose sequence
number is in the range [last-Nr + 1, last-Nr + recv-window] are accepted
(where last-Nr is the sequence number of the last acknowledged message).
Minimum value is 1, maximum is 32768, default is 16.
.TP
.BI "timeout=" n
Specifies timeout (in seconds) to wait peer completes tunnel and session negotiation.
.TP
.BI "rtimeout=" n
Specifies timeout (in seconds) to wait message acknowledge, if elapsed message retransmition will be performed.
Timeout is multiplied by two after each retransmission. So if
.BR rtimeout " is set to 1, first retransmission will occur after one second,"
second retransmission two seconds later, third one four seconds later, and so
on, until a reply is received or the
.BR retransmit " value is reached. Default value is 1."
.TP
.BI "rtimeout-cap=" n
Set the maximum interval between retransmissions. The exponential backoff
.RB "interval used by " rtimeout " will never grow above " rtimeout-cap .
.BR rtimeout-cap " must be higher than " rtimeout " and, according to RFC 2661,
must be no less than 8 (though accel-ppp doesn't enforce this rule).
Default value is 16.
.TP
.BI "retransmit=" n
Specifies maximum number of message retransmission, if exceeds connection will be terminated.
.TP
.BI "verbose=" n
If this option is given and 
.B n
is greater of zero then l2tp module will produce verbose logging.
.TP
.BI "mppe=" deny|allow|prefer|require
.TP
.BI "secret=" string
Specifies secret to connect to server.
.TP
.BI "hide-avps=" n
If this option is given and
.B n
is greater than 0, then attributes sent in L2TP packets will be hidden (for
AVPs that support it).
.TP
.BI "dataseq=" deny|allow|prefer|require
Specify data sequencing negotiation algorithm:
.br
.B deny
- don't send data packets with sequence numbers
.br
.B allow
- send data packets with sequence numbers if peer have requested so only
.br
.B prefer
- send data packets with sequence numbers and enable same for peer
.br
.B require
- send data packets with sequence numbers and enforce same for peer
.TP
.BI "reorder-timeout=" ms
Specifies timeout (in milliseconds) to wait for out-of-order packets. If 0, don't try to reorder.
.TP
.BI "use-ephemeral-ports=" 0|1
Specifies if an arbitrary source port is used when replying to a tunnel
establishment request. When this option is deactivated, the destination
port of the incoming request (SCCRQ) is used as source port for the
reply (SCCRP). Default value is 0.
.TP
.BI "ppp-max-mtu=" n
Set the maximum MTU value that can be negotiated for PPP over L2TP
sessions. Default value is 1420.
.TP
.BI "ifname=" ifname
If this option is given ppp interface will be renamed using
.B ifname
as a template, i.e l2tp%d => l2tp0.
.SH [sstp]
.br
Configuration of SSTP module.
.TP
.BI "bind=" x.x.x.x|ipv6address|unix:pathname|unix:@abstract
If this option is given then sstp server will bind to specified IP address
or unix pathname/abstract socket.
.TP
.BI "port=" n
If this option is given then sstp server will bind to specified port.
Default is 443.
.TP
.BI "verbose=" n
If this option is given and 
.B n
is greater of zero then sstp module will produce verbose logging.
.TP
.BI "timeout=" n
Timeout waiting reply from client in seconds.
Default is 60.
.TP
.BI "hello-interval=" n
If this option is given and greater than zero then sstp will send echo-request every 
.B n
seconds and drop connection without a reply.
Default is 60.
.TP
.BI "accept=" ssl,proxy
Specifies incoming connection acceptance mode.
.br
.B ssl
- enable SSL/TLS support.
.br
.B proxy
- enable PROXY protocol 1 & 2 support.
.TP
.BI "ssl-protocol=" ssl2|ssl3|tls1|tls1.1|tls1.2|tls1.3
Specifies the enabled SSL/TLS protocols supported by OpenSSL library.
.TP
.BI "ssl-dhparam=" pemfile
Specifies a file with DH parameters for DHE ciphers.
.TP
.BI "ssl-ecdh-curve=" string
Specifies a curves for ECDHE ciphers. Value is specified in the format understood by the OpenSSL library.
.TP
.BI "ssl-ciphers=" string
Specifies the enabled ciphers. The ciphers are specified in the format understood by the OpenSSL library.
.TP
.BI "ssl-prefer-server-ciphers=" n
If this option is given and 
.B n
is greater of zero then server ciphers should be preferred over client ciphers.
Default is 0.
.TP
.BI "ssl-pemfile=" pemfile
Specifies a file with the certificate in the PEM format for sstp server.
Certificate is also used to compute initial SHA1 and SHA256 certificate hash.
.TP
.BI "ssl-keyfile=" keyfile
Specifies a file with the secret key in the PEM format for sstp server.
If not set, secret key will be loaded from the
.BI pemfile
certificate.
.TP
.BI "cert-hash-proto=" sha1,sha256
Specifies hashing methods that can be used to compute the Compound MAC in the Crypto Binding attribute.
Default is sha1 and sha256 both.
.TP
.BI "cert-hash-sha1=" hexstring
Given hexadecimal value overrides SHA1 hash computed from the
.BI pemfile
certificate or used directly for non-ssl mode.
.TP
.BI "cert-hash-sha256=" hexstring
Given hexadecimal value overrides SHA256 hash computed from the
.BI pemfile
certificate or used directly for non-ssl mode.
.TP
.BI "host-name=" string
If this option is given, only sstp connection to specified host and with the same TLS SNI will be allowed.
.TP
.BI "http-error=" deny|allow|http[s]://host.tld[/path]
Specify http layer error behavior for non-sstp requests.
.br
.B deny
- reset connection without any error response.
.br
.B allow
- respond with http-specific status codes.
.br
.B http[s]://host.tld[/path]
- respond with http redirect to the specified location.
If
.B /path
is not specified, requested uri will be appended automatically
.br
Default value is allow.
.TP
.BI "ifname=" ifname
If this option is given ppp interface will be renamed using
.B ifname
as a template, i.e sstp%d => sstp0.
.TP
.BI "ppp-max-mtu=" n
Set the maximum MTU value that can be negotiated for PPP over SSTP sessions.
Default value is 1452, maximum is 4087.
.SH [radius]
.br
Configuration of RADIUS module.
.TP
.BI "nas-identifier=" identifier
Specifies value to send to RADIUS server in NAS-Identifier attribute and to be matched in DM/CoA requests.
.TP
.BI "nas-ip-address=" x.x.x.x
Specifies value to send to RADIUS server in NAS-IP-Address attribute and to be matched in DM/CoA requests.
Also DM/CoA server will bind to that address.
.TP
.BI "gw-ip-address=" x.x.x.x
Specifies address to use as local address of ppp interfaces if Framed-IP-Address received from RADIUS server.
.TP
.BI "auth-server=" x.x.x.x:port,secret
Specifies IP address, port and secret of authentication RADIUS server. (obsolete)
.TP
.BI "acct-server=" x.x.x.x:port,secret
Specifies IP address, port and secret of accounting RADIUS server. (obsolete)
.TP
.BI "server=" address,secret[,auth-port=1812][,acct-port=1813][,req-limit=0][,fail-timeout=0,max-fail=0,][,weight=1][,backup]
Specifies IP address, secret, ports of RADIUS server.
.br
.B req-limit
- number of simultaneous requests to server (0 - unlimited).
.br
.B fail-time
- if server doesn't responds mark it as unavailable for this time (sec).
.br
.B max-fail
- number of unreplied requests in a row after that mark server as unavailable.
.br
.B weight
- specifies weight of server for multi-server configuration.
.br
.B backup
- mark server as backup server f.e. use this server only when all other servers are failed.
.br
If you want to specify only authentication or accounting server then set auth-port/acct-port to zero.
You may specify multiple radius servers.
.TP
.BI "dae-server=" x.x.x.x:port,secret
Specifies IP address, port to bind and secret for Dynamic Authorization Extension server (DM/CoA).
.TP
.BI "dm_coa_secret=" secret (deprecated, use dae-server instead)
Specifies secret to use in DM/CoA communication.
.TP
.BI "acct-interim-interval=" n
Specifies interval in seconds to send accounting information (may be overriden by radius Acct-Interim-Interval attribute)
.TP
.BI "acct-interim-jitter=" n
Specifies absolute maximum jitter value in seconds to be applied to accounting information interval.
.TP
.BI "verbose=" n
If this option is given and 
.B n
is greater of zero then radius module will produce verbose logging.
.TP
.BI "interim-verbose=" n
If this option is given and 
.B n
is greater of zero then radius module will produce verbose logging of interim radius packets.
.TP
.BI "timeout=" n
Timeout to wait response from server (sec) 
.TP
.BI "max-try=" n
Specifies number of tries to send Access-Request/Accounting-Request queries.
.TP
.BI "acct-timeout=" n
Specifies timeout of accounting interim update.
.TP
.BI "acct-delay-time=" 0|1
Specifies whether radius client should include Acct-Delay-Time attribute to accounting requests (default 0).
.TP
.BI "acct-on=" 0|1
Specifies whether radius client should send Account-Request with Acct-Status-Type=Accounting-On on startup and Acct-Status-Type=Accounting-Off on shutdown.
.TP
.BI "attr-tunnel-type=" name
Specifies custom attribute name to be used to send tunnel type (as string).
.TP
.BI "default-realm=" realm
Appends specified realm to username if there was no realm already.
.TP
.BI "strip-realm=" 0|1
Strips realm from username, can be used along with
.B
default-realm
option for realm substitution.
.TP
.BI "sid-in-auth=0|1"
Specifies should accel-ppp generate and send Acct-Session-Id on Access-Request packet.
.SH [log]
.br
Configuration of log and log_file modules.
.TP
.BI "log-file=" file
Path to file to write general log.
.TP
.BI "log-emerg=" file
Path to file to write emergency messages.
.TP
.BI "log-fail-file=" file
Path to file to write authentication failed session log.
.TP
.BI "log-tcp=" x.x.x.x:port
Send logs to specified host.
.TP
.BI "syslog=" ident[,facility]
Send logs to system logger.
Facility may be: daemon, local0-local7 or numeric value.
.TP
.BI "copy=" n
If this options is given and greater than zero logging engine will duplicate session log in general log.
(Useful when per-session/per-user logs are not used)
.TP
.BI "per-session-dir=" dir
Directory for session logs. If specified each session will be logged separately to file which name is unique session identifier.
.TP
.BI "per-user-dir=" dir
Directory for user logs. If specified all sessions of same user will be logged to file which name is user name.
.TP
.BI "per-session=" n
If specified and n is greater than zero each session of same user will be logger separately to directory specified by "per-user-dir" 
and subdirectory which name is user name and to file which name os unique session identifier.
.TP
.BI "level=" n
Specifies log level which values are:
.br
.B 0
turn off all logging
.br
.B 1
log only error messages
.br
.B 2
log error and warning messages
.br
.B 3
log error, warning and minimum information messages (use this level in conjunction with verbose option of other modules if you need verbose logging)
.br
.B 4
log error, warning and full information messages (use this level in conjunction with verbose option of other modules if you need verbose logging)
.br
.B 5
log all messages including debug messages
.SH [log-pgsql]
.br
Configuration of log_pgsql module.
.TP
.BI "conninfo=" conninfo
Conninfo to connect to PostgreSQL server.
.TP
.BI "log-table=" table
Table to send log messages. Table must contain following field:
.br
.B timestamp
timestamp
.br
.B username
text
.br
.B sessionid
text
.br
.B msg
text
.SH [pppd_compat]
.br
Configuration of pppd_compat module.
.TP
.BI "ip-pre-up=" file
Path to ip-pre-up script which is executed before ppp interface comes up, useful to setup firewall rules before any traffic can pass through the interface.
.TP
.BI "ip-up=" file
Path to ip-up script which is executed when ppp interfaces is completely configured and started.
.TP
.BI "ip-down=" file
Path to ip-down script which is executed when session is about to terminate.
.TP
.BI "ip-change=" file
Path to ip-change script which is executed for RADIUS CoA handling.
.TP
.BI "radattr-prefix=" prefix
Prefix of radattr files (for example /var/run/radattr, resulting files will be /var/run/radattr.pppX)
.TP
.BI "verbose=" n
If specified and greater than zero pppd_module will produce verbose logging.
.SH [chap-secrets]
.br
Configuration of chap-secrets module.
.TP
.BI "gw-ip-address=" x.x.x.x[/mask]
Specifies address to use as local address of ppp interfaces if chap-secrets is used for IP address assignment. Mask is used for IPoE.
.TP
.BI "chap-secrets=" file
Specifies alternate chap-secrets file location (default is /etc/ppp/chap-secrets).
.TP
.BI "encrypted=" 0|1
Specifies either chap-secrets is encrypted (read README).
.TP
.BI "username-hash=" hash1[,hash2]
Specifies hash chain to calculate username hash.
.br
.BR hash1 , \ hash2
are openssl known digest names (md5, sha1, etc).
.SH [ip-pool]
.br
Configuration of ippool module.
.TP
.BI "gw-ip-address=" x.x.x.x
Specifies single IP address to be used as local address of ppp interfaces.
.TP
.BI "shuffle=" 1|0
Specifies whether to shuffle initial address list.
.TP
.BI "gw=" range
Specifies range of local address of ppp interfaces if form:
.br
.B x.x.x.x/mask[,name=pool_name][,next=next_pool_name]
(for example 10.0.0.0/8)
.br
.B x.x.x.x-y[,name=pool_name][,next=next_pool_name]
(for example 10.0.0.1-254)
.TP
.BI "tunnel=" range
Specifies range of remote address of ppp interfaces if form:
.br
.B x.x.x.x/mask[,name=pool_name][,next=next_pool_name]
.br
.B x.x.x.x-y[,name=pool_name][,next=next_pool_name]
.TP
.BI "x.x.x.x/mask[,name=pool_name][,next=next_pool_name] or x.x.x.x-y[,name=pool_name][,next=next_pool_name]"
Also specifies range of remote address of ppp interfaces.
.TP
.BI "attr=" attribute
Specifies which Radius attribute contains pool name.
.TP
.BI "vendor=" vendor
If attribute is vendor-specific then specify vendor name in this option.
.SH [ipv6-pool]
.br
Configuration of ipv6pool module.
.TP
.BI ipv6prefix/mask,prefix_len[,name=pool_name][,next=next_pool_name]
.br
.B fc00:0:1::/48,64 - specifies pool of address by dividing prefix fc00:0:1::/48 to networks with 64 prefix len, e.g:
.br
fc00:0:1:0::/64
.br
fc00:0:1:1::/64
.br
 ...
.br
fc00:0:1:ffff::/64
.TP
.BI "delegate=" ipv6prefix/mask,prefix_len[,name=pool_name][,next=next_pool_name]
Specifies range of prefixes to delegate to clients through DHCPv6 prefix delegation (rfc3633).
Format is same as described above.
.TP
.BI "gw-ip6-address=" ipv6address
Specifies gateway address (used only for /128 prefixes)
.TP
.BI "attr-prefix=" attribute
Specifies which Radius attribute contains delegated prefix pool name.
.TP
.BI "attr-address=" attribute
Specifies which Radius attribute contains stateful address pool name.
.TP
.BI "vendor=" vendor
If attribute is vendor-specific then specify vendor name in this option.
.SH [connlimit]
.br
This module limits connection rate from single source.
.TP
.BI "limit=" count/time
Specifies acceptable rate of connections, for example limit=1/s or limit=10/m.
.TP
.BI "burst=" count
.TP
.BI "timeout=" n
Specifies timeout in seconds after which module doesn't check rate until burst number of connections will be arrived.
.SH [shaper]
.br
This module controls shaper.
.TP
.BI "attr=" name
Specifies which radius attribute contains rate information. Default - Filter-ID.
.TP
.BI "attr-up=" name
.TP
.BI "attr-down=" name
Specifies which radius attributes contains rate information for upstream and downstream respectively.
.TP
.BI "burst-factor=" n
Burst will be calculated as rate multyply burst-factor.
.TP
.BI "up-burst-factor=" n
.TP
.BI "down-burst-factor=" n
Specifies burst factor for upstream and downstream respectively.
.TP
.BI "latency=" n
Specifies latency (in milliseconds) parameter of tbf qdisc.
.TP
.BI "mpu=" n
Specifies mpu parameter of tbf qdisc and policer.
.TP
.BI "r2q=" n
Specifies r2q parameter of root htb qdisc.
.TP
.BI "quantum=" n
Specifies quantum parameter of htb classes.
.TP
.BI "moderate-quantum=" 1|0
If fixed quantum is not specified and this option is specified then shaper module will check for quantum value is valid (in range 1000-200000).
.TP
.BI "fwmark=" n
Specifies the fwmark for traffic that won't be passed through shaper.
.TP
.BI "up-limiter=" police|htb
Specifes upstream rate limiting method.
.TP
.BI "down-limiter=" tbf|htb
Specifies downstream rate limiting method.
.TP
.BI "leaf-qdisc=" "qdisc parameters"
In case if htb is used as up-limiter or down-limiter specified leaf qdisc can be attached automatically.
At present sfq and fq_codel qdiscs are implemented. Parameters are same as for tc:
.br
sfq [ limit NUMBER ] [ perturn SECS ] [ quantum BYTES ]
.br
fq_codel [ limit PACKETS ] [flows NUMBER ] [ target TIME ] [ interval TIME ] [quantum BYTES ] [ [no]ecn ]
.TP
.BI "rate-multiplier=" n
Due to accel-ppp operates with rates in kilobit basis if you send rates in different basis then you can use this option to bring your values to kilobits.
.TP
.BI "rate-limit=" download_speed/upload_speed
Specifies, should accel-ppp set default rate-limit for clients. Clients rate-limit will be overwritten by RADIUS filter attributes or chap-secrets rate-limit params.
.SH [cli]
.br
Configuration of the command line interface.
.TP
.BI "verbose=" n
If \fIn\fR = 1 then cli module will log IP address of each connection.
.br
If \fIn\fR = 2 then cli module will also log passed commands.
.TP
.BI "tcp=" host:port
Defines on which IP address and port the TCP module will listen for incoming
connections. When \fIhost\fR is empty, the TCP module listens on all local
interfaces. It isn't loaded if this option isn't defined.
.TP
.BI "telnet=" host:port
Defines on which IP address and port the Telnet module will listen for incoming
connections. When \fIhost\fR is empty, the Telnet module listens on all local
interfaces. It isn't loaded if this option isn't defined.
.TP
.BI "password=" passwd
Defines the password to be used by the TCP and Telnet modules for
authenticating clients. No authentication is performed if this option
isn't defined.
.TP
.BI "prompt=" prompt
Defines the prompt string used by the Telnet module (defaults
to \fIaccel-ppp\fR).
.TP
.BI "history-file=" filename
Defines the file used by the Telnet module for loading and storing its
command history (defaults to \fI/var/lib/accel-ppp/history\fR).
.TP
.BI "sessions-columns=" column_list
Defines the default set of columns to be displayed by the "show sessions"
command (defaults to
\fIifname,username,calling-sid,ip,rate-limit,type,comp,state,uptime\fR).
Invalid column names are silently discarded.