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diff --git a/docs/services.rst b/docs/services.rst new file mode 100644 index 00000000..f66cc343 --- /dev/null +++ b/docs/services.rst @@ -0,0 +1,876 @@ +.. _services: + +Services +======== + +DHCP +---- + +Multiple DHCP Servers can be run from a single machine. Each DHCP service is +identified by a `shared-network-name`. + +DHCP Server Example +^^^^^^^^^^^^^^^^^^^ + +In this example, we are offering address space in the 172.16.17.0/24 network, +which is on eth1, and pppoe0 is our connection to the internet. We are using +the network name `dhcpexample`. + +Prerequisites +^^^^^^^^^^^^^ + +Configuring the PPPoE interface is assumed to be done already, and appears +on `pppoe0` + +Interface Configuration +^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: sh + + set interface eth1 address 172.16.17.1/24 + +Multiple ranges can be defined and can contain holes. + +.. code-block:: sh + + set service dhcp-server shared-network-name dhcpexample authoritative + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 default-router 172.16.17.1 + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 dns-server 172.16.17.1 + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 lease 86400 + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 range 0 start 172.16.17.100 + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 range 0 stop 172.16.17.199 + +Failover +^^^^^^^^ + +VyOS provides support for DHCP failover: + +.. code-block:: sh + + set service dhcp-server shared-network-name 'LAN' subnet '192.168.0.0/24' failover local-address '192.168.0.1' + set service dhcp-server shared-network-name 'LAN' subnet '192.168.0.0/24' failover name 'foo' + set service dhcp-server shared-network-name 'LAN' subnet '192.168.0.0/24' failover peer-address '192.168.0.2' + +.. note:: `name` must be identical on both sides! + +The primary and secondary statements determines whether the server is primary or secondary + +.. code-block:: sh + + set service dhcp-server shared-network-name 'LAN' subnet '192.168.0.0/24' failover status 'primary' + +or + +.. code-block:: sh + + set service dhcp-server shared-network-name 'LAN' subnet '192.168.0.0/24' failover status 'secondary' + +.. note:: In order for the primary and the secondary DHCP server to keep + their lease tables in sync, they must be able to reach each other on TCP + port 647. If you have firewall rules in effect, adjust them accordingly. + +Static mappings MAC/IP +^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: sh + + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 static-mapping static-mapping-01 ip-address 172.16.17.10 + set service dhcp-server shared-network-name dhcpexample subnet 172.16.17.0/24 static-mapping static-mapping-01 mac-address ff:ff:ff:ff:ff:ff + +Explanation +^^^^^^^^^^^ + +:code:`set service dhcp-server shared-network-name dhcpexample authoritative` +This says that this device is the only DHCP server for this network. If other +devices are trying to offer DHCP leases, this machine will send 'DHCPNAK' to +any device trying to request an IP address that is not valid for this network. + +:code:`set service dhcp-server shared-network-name dhcpexample subnet +172.16.17.0/24 default-router 172.16.17.1` This is a configuration parameter +for the subnet, saying that as part of the response, tell the client that I am +the default router for this network + +:code:`set service dhcp-server shared-network-name dhcpexample subnet +172.16.17.0/24 dns-server 172.16.17.1` This is a configuration parameter for +the subnet, saying that as part of the response, tell the client that I am the +DNS server for this network. If you do not want to run a DNS server, you could +also provide one of the public DNS servers, such as google's. You can add +multiple entries by repeating the line. + +:code:`set service dhcp-server shared-network-name dhcpexample subnet +172.16.17.0/24 lease 86400` Assign the IP address to this machine for 24 +hours. It is unlikely you'd need to shorten this period, unless you are running +a network with lots of devices appearing and disappearing. + +:code:`set service dhcp-server shared-network-name dhcpexample subnet +172.16.17.0/24 start 172.16.17.100 stop 172.16.17.199` Make the IP Addresses +between .100 and .199 available for clients. + +DHCPv6 server +------------- + +VyOS provides DHCPv6 server functionality which is described in this section. +In order to use the DHCPv6 server it has to be enabled first: + +.. code-block:: sh + + set service dhcpv6-server + +To restart the DHCPv6 server (operational mode): + +.. code-block:: sh + + restart dhcpv6 server + +To show the current status of the DHCPv6 server use: + +.. code-block:: sh + + show dhcpv6 server status + +Show statuses of all assigned leases: + +.. code-block:: sh + + show dhcpv6 server leases + +DHCPv6 server options +^^^^^^^^^^^^^^^^^^^^^ + +DHCPv6 server preference value +****************************** + +Clients receiving advertise messages from multiple servers choose the server +with the highest preference value. The range for this value is `0...255`. Set +a preference value for the DHCPv6 server: + +.. code-block:: sh + + set service dhcpv6-server preference <preference value> + +Delete a preference: + +.. code-block:: sh + + set service dhcpv6-server preference + +Show current preference: + +.. code-block:: sh + + show service dhcpv6-server preference + +Specify address lease time +************************** + +The default lease time for DHCPv6 leases is 24 hours. This can be changed by +supplying a `default-time`, `maximum-time` and `minimum-time` (all values in +seconds): + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> lease-time {default <default-time> | maximum <maximum-time> | minimum <minimum-time>} + +Reset the custom lease times: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> lease-time {default | maximum | minimum} + +Show the current configuration: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> lease-time {default | maximum | minimum} + +Specify NIS domain +****************** + +A Network Information (NIS) domain can be set to be used for DHCPv6 clients: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-domain <nis-domain-name> + +To Delete the NIS domain: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-domain <nis-domain-name> + +Show a configured NIS domain: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-domain <nis-domain-name> + +Specify NIS+ domain +******************* + +The procedure to specify a Network Information Service Plus (NIS+) domain is +similar to the NIS domain one: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-domain <nisplus-domain-name> + +To Delete the NIS+ domain: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-domain <nisplus-domain-name> + +Show a configured NIS domain: + + # show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-domain <nisplus-domain-name> + +Specify NIS server address +************************** + +To specify a NIS server address for DHCPv6 clients: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-server <IPv6 address> + +Delete a specified NIS server address: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-server <IPv6 address> + +Show specified NIS server addresses: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nis-server + +Specify NIS+ server address +*************************** + +To specify a NIS+ server address for DHCPv6 clients: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-server <IPv6 address> + +Delete a specified NIS+ server address: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-server <IPv6 address> + +Show specified NIS+ server addresses: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> nisplus-server + +Specify a SIP server address for DHCPv6 clients +*********************************************** + +By IPv6 address +############### + + +A Session Initiation Protocol (SIP) server address can be specified for DHCPv6 clients: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-address <IPv6 address> + +Delete a specified SIP server address: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-address <IPv6 address> + +Show specified SIP server addresses: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-address + +By FQDN +####### + +A name for SIP server can be specified: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-name <sip-server-name> + +Delete a specified SIP server name: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-name <sip-server-name> + +Show specified SIP server names: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> sip-server-name + +Simple Network Time Protocol (SNTP) server address for DHCPv6 clients +********************************************************************* + +A SNTP server address can be specified for DHCPv6 clients: + +.. code-block:: sh + + set service dhcpv6-server shared-network-name <name> subnet <ipv6net> sntp-server-address <IPv6 address> + +Delete a specified SNTP server address: + +.. code-block:: sh + + delete service dhcpv6-server shared-network-name <name> subnet <ipv6net> sntp-server-address <IPv6 address> + +Show specified SNTP server addresses: + +.. code-block:: sh + + show service dhcpv6-server shared-network-name <name> subnet <ipv6net> sntp-server-address + +DHCPv6 address pools +^^^^^^^^^^^^^^^^^^^^ + +DHCPv6 address pools must be configured for the system to act as a DHCPv6 +server. The following example describes a common scenario. + +Example 1: DHCPv6 address pool +****************************** + +A shared network named `NET1` serves subnet `2001:db8:100::/64` which is +connected to `eth1`, a DNS server at `2001:db8:111::111` is used for name +services. The range of the address pool shall be `::100` through `::199`. The +lease time will be left at the default value which is 24 hours. + +.. code-block:: sh + + set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 address-range start 2001:db8:100::100 stop 2001:db8:100::199 + set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 name-server 2001:db8:111::111 + +Commit the changes and show the configuration: + +.. code-block:: sh + + commit + show service dhcpv6-server + shared-network-name NET1 { + subnet 2001:db8:100::/64 { + address-range { + start 2001:db8:100::100 { + stop 2001:db8:100::199 + } + } + name-server 2001:db8:111::111 + } + } + +Static mappings +^^^^^^^^^^^^^^^ + +In order to map specific IPv6 addresses to specific hosts static mappings can +be created. The following example explains the process. + +Example 1: Static IPv6 MAC-based mapping +**************************************** + +IPv6 address `2001:db8:100::101` shall be statically mapped to a device with +MAC address `00:15:c5:b7:5e:23`, this host-specific mapping shall be named +`client1`. + +.. note:: The MAC address identifier is defined by the last 4 byte of the + MAC address. + +.. code-block:: sh + + set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 static-mapping client1 ipv6-address 2001:db8:100::101 + set service dhcpv6-server shared-network-name NET1 subnet 2001:db8:100::/64 static-mapping client1 identifier c5b75e23 + +Commit the changes and show the configuration: + +.. code-block:: sh + + show service dhcp-server shared-network-name NET1 + shared-network-name NET1 { + subnet 2001:db8:100::/64 { + name-server 2001:db8:111::111 + address-range { + start 2001:db8:100::100 { + stop 2001:db8:100::199 { + } + } + static-mapping client1 { + ipv6-address 2001:db8:100::101 + identifier c5b75e23 + } + } + } + + +DHCP Relay +---------- + +If you want your router to forward DHCP requests to an external DHCP server +you can configure the system to act as a DHCP relay agent. The DHCP relay +agent works with IPv4 and IPv6 addresses. + +All interfaces used for the DHCP relay must be configured. See +https://wiki.vyos.net/wiki/Network_address_setup. + +DHCP relay example +^^^^^^^^^^^^^^^^^^ + +.. figure:: _static/images/service_dhcp-relay01.png + :scale: 80 % + :alt: DHCP relay example + + DHCP relay example + +In this example the interfaces used for the DHCP relay are eth1 and eth2. The +router receives DHCP client requests on eth1 and relays them through eth2 to +the DHCP server at 10.0.1.4. + +Configuration +^^^^^^^^^^^^^ + +Enable DHCP relay for eth1 and eth2: + +.. code-block:: sh + + set service dhcp-relay interface eth1 + set service dhcp-relay interface eth2 + +Set the IP address of the DHCP server: + +.. code-block:: sh + + set service dhcp-relay server 10.0.1.4 + +The router should discard DHCP packages already containing relay agent +information to ensure that only requests from DHCP clients are forwarded: + +.. code-block:: sh + + set service dhcp-relay relay-options relay-agents-packets discard + +Commit the changes and show the results: + +.. code-block:: sh + + commit + show service dhcp-relay + interface eth1 + interface eth2 + server 10.0.1.4 + relay-options { + relay-agents-packets discard + } + +The DHCP relay agent can be restarted with: + +.. code-block:: sh + + restart dhcp relay-agent + +DHCPv6 relay example +^^^^^^^^^^^^^^^^^^^^ + +.. figure:: _static/images/service_dhcpv6-relay01.png + :scale: 80 % + :alt: DHCPv6 relay example + + DHCPv6 relay example + +In this example DHCPv6 requests are received by the router on eth1 (`listening +interface`) and forwarded through eth2 (`upstream interface`) to the external +DHCPv6 server at 2001:db8:100::4. + +Configuration +************* + +Set eth1 to be the listening interface for the DHCPv6 relay: + +.. code-block:: sh + + set service dhcpv6-relay listen-interface eth1 + +Set eth2 to be the upstream interface and specify the IPv6 address of the DHCPv6 server: + +.. code-block:: sh + + set service dhcpv6-relay upstream-interface eth2 address 2001:db8:100::4 + +Commit the changes and show results: + +.. code-block:: sh + + commit + show service dhcpv6-relay + listen-interface eth1 { + } + upstream-interface eth2 { + address 2001:db8:100::4 + } + +Show the current status of the DHCPv6 relay agent: + +.. code-block:: sh + + show dhcpv6 relay-agent status + +The DHCPv6 relay agent can be restarted with: + +.. code-block:: sh + + restart dhcpv6 relay-agent + +Additional parameters +^^^^^^^^^^^^^^^^^^^^^ + +DHCP relay agent options +************************ + +Set the maximum hop count before packets are discarded. Range 0...255, +default 10. + +* :code:`set service dhcp-relay relay-options hop-count 'count'` + +Set maximum size of DHCP packets including relay agent information. If a +DHCP packet size surpasses this value it will be forwarded without appending +relay agent information. Range 64...1400, default 576. + +* :code:`set service dhcp-relay relay-options max-size 'size'` + +Set the port used to relay DHCP client messages. Range 1...65535, default 67. +After setting a different port, requests are still accepted on port 67 but +replies are forwarded to 255.255.255.255 port 0 instead of 68. + +* :code:`set service dhcp-relay relay-options port 'port'` + +Four policies for reforwarding DHCP packets exist: + +* **append:** The relay agent is allowed to append its own relay information + to a received DHCP packet, disregarding relay information already present in + the packet. + +* **discard:** Received packets which already contain relay information will + be discarded. + +* **forward:** All packets are forwarded, relay information already present + will be ignored. + +* **replace:** Relay information already present in a packet is stripped and + replaced with the router's own relay information set. + +* :code:`set service dhcp-relay relay-options relay-agents-packet 'policy'` + +DHCPv6 relay agent options +************************** + +Set listening port for DHCPv6 requests. Default: 547. + +* :code:`set service dhcpv6-relay listen-port 'port'` + +Set maximum hop count before packets are discarded. Default: 10. + +* :code:`set service dhcpv6-relay max-hop-count 'count'` + +If this is set the relay agent will insert the interface ID. This option is +set automatically if more than one listening interfaces are in use. + +* :code:`set service dhcpv6-relay use-interface-id-option` + +DNS Forwarding +-------------- + +Use DNS forwarding if you want your router to function as a DNS server for the +local network. There are several options, the easiest being 'forward all +traffic to the system DNS server(s)' (defined with set system name-server): + +.. code-block:: sh + + set service dns forwarding system + +Manually setting DNS servers for forwarding: + +.. code-block:: sh + + set service dns forwarding name-server 8.8.8.8 + set service dns forwarding name-server 8.8.4.4 + +Manually setting DNS servers with IPv6 connectivity: + +.. code-block:: sh + + set service dns forwarding name-server 2001:4860:4860::8888 + set service dns forwarding name-server 2001:4860:4860::8844 + +Setting a forwarding DNS server for a specific domain: + +.. code-block:: sh + + set service dns forwarding domain example.com server 192.0.2.1 + +Example 1 +^^^^^^^^^ + +Router with two interfaces eth0 (WAN link) and eth1 (LAN). A DNS server for the +local domain (example.com) is at 192.0.2.1, other DNS requests are forwarded +to Google's DNS servers. + +.. code-block:: sh + + set service dns forwarding domain example.com server 192.0.2.1 + set service dns forwarding name-server 8.8.8.8 + set service dns forwarding name-server 8.8.4.4 + set service dns forwarding listen-on 'eth1' + +Example 2 +^^^^^^^^^ + +Same as example 1 but with additional IPv6 addresses for Google's public DNS +servers: + +.. code-block:: sh + + set service dns forwarding domain example.com server 192.0.2.1 + set service dns forwarding name-server 8.8.8.8 + set service dns forwarding name-server 8.8.4.4 + set service dns forwarding name-server 2001:4860:4860::8888 + set service dns forwarding name-server 2001:4860:4860::8844 + set service dns forwarding listen-on 'eth1' + +Dynamic DNS +----------- + +VyOS is able to update a remote DNS record when an interface gets a new IP +address. In order to do so, VyOS includes ddclient_, a perl script written for +this exact purpose. + +ddclient_ uses two methods to update a DNS record. The first one will send +updates directly to the DNS daemon, in compliance with RFC2136_. The second +one involves a third party service, like DynDNS.com or any other similar +website. This method uses HTTP requests to transmit the new IP address. You +can configure both in VyOS. + +VyOS CLI and RFC2136 +^^^^^^^^^^^^^^^^^^^^ + +First, create an RFC2136_ config node : + +.. code-block:: sh + + edit service dns dynamic interface eth0 rfc2136 <confignodename> + +Present your RNDC key to ddclient : + +.. code-block:: sh + + set key /config/dyndns/mydnsserver.rndc.key + +Set the DNS server IP/FQDN : + +.. code-block:: sh + + set server dns.mydomain.com + +Set the NS zone to be updated : + +.. code-block:: sh + + set zone mydomain.com + +Set the records to be updated : + +.. code-block:: sh + + set record dyn + set record dyn2 + +You can optionally set a TTL (note : default value is 600 seconds) : + +.. code-block:: sh + + set ttl 600 + +This will generate the following ddclient config blocks: + +.. code-block:: sh + + server=dns.mydomain.com + protocol=nsupdate + password=/config/dyndns/mydnsserver.rndc.key + ttl=600 + zone=mydomain.com + dyn + server=dns.mydomain.com + protocol=nsupdate + password=/config/dyndns/mydnsserver.rndc.key + ttl=600 + zone=mydomain.com + dyn2 + +You can also keep a different dns zone updated. Just create a new config node: + +.. code-block:: sh + + edit service dns dynamic interface eth0 rfc2136 <confignode2> + +VyOS CLI and HTTP dynamic DNS services +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +VyOS is also able to use any service relying on protocols supported by ddclient. + +To use such a service, you must define a login, a password, one or multiple +hostnames, a protocol and a server. + +.. code-block:: sh + + edit service dns dynamic interface eth0 service HeNet + set login my-login # set password my-password + set host-name my-tunnel-id + set protocol dyndns2 + set server ipv4.tunnelbroker.net + +VyOS is also shipped with a list of known services. You don't need to set the +protocol and server value as VyOS has defaults provided for those. These are +the services VyOS knows about: + +* afraid +* changeip +* dnspark +* dslreports +* dyndns +* easydns +* namecheap +* noip +* zoneedit + +To use DynDNS for example: + +.. code-block:: sh + + edit service dns dynamic interface eth0 service dyndns + set login my-login + set password my-password + set host-name my-dyndns-hostname + +It's possible to use multiple services : + +.. code-block:: sh + + edit service dns dynamic interface eth0 service dyndns + set login my-login + set password my-password + set host-name my-dyndns-hostname + edit service dns dynamic interface eth0 service HeNet + set login my-login + set password my-password + set host-name my-tunnel-id + set protocol dyndns2 + set server ipv4.tunnelbroker.net + +ddclient behind NAT +^^^^^^^^^^^^^^^^^^^ + +By default, ddclient will update a dynamic dns record using the IP address +directly attached to the interface. If your VyOS instance is behind NAT, your +record will be updated to point to your internal IP. + +ddclient_ has another way to determine the WAN IP address. This is controlled +by these two options: + +.. code-block:: sh + + set service dns dynamic interface eth0 use-web url + set service dns dynamic interface eth0 use-web skip + +ddclient_ will load the webpage at `[url]` and will try to extract an IP +address for the response. ddclient_ will skip any address located before the +string set in `[skip]`. + +mDNS Repeater +------------- + +Starting with VyOS 1.2 a `Multicast DNS`_ (mDNS) repeater functionality is +provided. + +Multicast DNS uses the 224.0.0.51 address, which is "administratively scoped" +and does not leave the subnet. It re-broadcast mDNS packets from one interface +to other interfaces. This enables support for e.g. Apple Airplay devices across +multiple VLANs. + +To enable mDNS repeater you need to configure at least two interfaces. To re- +broadcast all mDNS packets from `eth0` to `eth1` and vice versa run: + +.. code-block:: sh + + set service mdns repeater interface eth0 + set service mdns repeater interface eth1 + +mDNS repeater can be temporarily disabled without deleting the service using + +.. code-block:: sh + + set service mdns repeater disable + +.. note:: You can not run this in a VRRP setup, if multiple mDNS repeaters + are launched in a subnet you will experience the mDNS packet storm death! + +UDP broadcast relay +------------------- + +Certain vendors use broadcasts to identify their equipemnt within one ethernet +segment. Unfortunately if you split your network with multiple VLANs you loose +the ability of identifying your equiment. + +This is where "UDP broadcast relay" comes into play! It will forward received +broadcasts to other configured networks. + +Every UDP port which will be forward requires one unique ID. Currently we +support 99 IDs! + +To Forward broadcasts on port 1900 for eth3, eth4 and eth5 configure the service +as follows: + +.. code-block:: sh + + set service broadcast-relay id 1 description 'SONOS' + set service broadcast-relay id 1 interface 'eth3' + set service broadcast-relay id 1 interface 'eth4' + set service broadcast-relay id 1 interface 'eth5' + set service broadcast-relay id 1 port '1900' + +Forward broadcasts on port 6969 for eth3, eth4 + +.. code-block:: sh + + set service broadcast-relay id 2 description 'SONOS MGMT' + set service broadcast-relay id 2 interface 'eth3' + set service broadcast-relay id 2 interface 'eth4' + set service broadcast-relay id 2 port '6969' + +Each broadcast relay instance can be individually disabled without deleting the +configured node by: + +.. code-block:: sh + + set service broadcast-relay id <n> disable + +In addition you can also disable the whole service without removing the +configuration by: + +.. code-block:: sh + + set service broadcast-relay disable + +.. note:: You can run the UDP broadcast relay service on multiple routers + connected to a subnet. There is **NO** UDP broadcast relay packet storm! + +.. _ddclient: http://sourceforge.net/p/ddclient/wiki/Home/ +.. _RFC2136: https://www.ietf.org/rfc/rfc2136.txt +.. _`Multicast DNS`: https://en.wikipedia.org/wiki/Multicast_DNS |