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.. _router-advert:
#####################
Router Advertisements
#####################
:abbr:`RAs (Router advertisements)` are described in :rfc:`4861#section-4.6.2`.
They are part of what is known as :abbr:`SLAAC (Stateless Address
Autoconfiguration)`.
Supported interface types:
* bonding
* bridge
* ethernet
* geneve
* l2tpv3
* openvpn
* pseudo-ethernet
* tunnel
* vxlan
* wireguard
* wireless
* wwan
*************
Configuration
*************
.. cfgcmd:: set service router-advert interface <interface> ...
.. stop_vyoslinter
.. csv-table::
:header: "Field", "VyOS Option", "Description"
:widths: 10, 10, 20
"Cur Hop Limit", "hop-limit", "Hop count field of the outgoing RA packets"
"""Managed address configuration"" flag", "managed-flag", "Tell hosts to use the administered stateful protocol (i.e. DHCP) for autoconfiguration"
"""Other configuration"" flag", "other-config-flag", "Tell hosts to use the administered (stateful) protocol (i.e. DHCP) for autoconfiguration of other (non-address) information"
"MTU","link-mtu","Link MTU value placed in RAs, excluded in RAs if unset"
"Router Lifetime","default-lifetime","Lifetime associated with the default router in units of seconds"
"Reachable Time","reachable-time","Time, in milliseconds, that a node assumes a neighbor is reachable after having received a reachability confirmation"
"Retransmit Timer","retrans-timer","Time in milliseconds between retransmitted Neighbor Solicitation messages"
"Default Router Preference","default-preference","Preference associated with the default router"
"Interval", "interval", "Min and max intervals between unsolicited multicast RAs"
"DNSSL", "dnssl", "DNS search list to advertise"
"Name Server", "name-server", "Advertise DNS server per https://tools.ietf.org/html/rfc6106"
"Auto Ignore Prefix", "auto-ignore", "Exclude a prefix from being advertised when the wildcard ::/64 prefix is used"
.. start_vyoslinter
Advertising a Prefix
--------------------
.. cfgcmd:: set service router-advert interface <interface> prefix <prefix/mask>
.. note:: You can also opt for using `::/64` as prefix for your :abbr:`RAs (Router
Advertisements)`. This is a special wildcard prefix that will emit :abbr:`RAs (Router Advertisements)` for every prefix assigned to the interface.
This comes in handy when using dynamically obtained prefixes from DHCPv6-PD.
.. stop_vyoslinter
.. csv-table::
:header: "VyOS Field", "Description"
:widths: 10,30
"decrement-lifetime", "Lifetime is decremented by the number of seconds since the last RA - use in conjunction with a DHCPv6-PD prefix"
"deprecate-prefix", "Upon shutdown, this option will deprecate the prefix by announcing it in the shutdown RA"
"no-autonomous-flag","Prefix can not be used for stateless address auto-configuration"
"no-on-link-flag","Prefix can not be used for on-link determination"
"preferred-lifetime","Time in seconds that the prefix will remain preferred (default 4 hours)"
"valid-lifetime","Time in seconds that the prefix will remain valid (default: 30 days)"
.. start_vyoslinter
Advertising a NAT64 Prefix
--------------------------
.. cfgcmd:: set service router-advert interface <interface> nat64prefix <prefix/mask>
Enable PREF64 option as outlined in :rfc:`8781`.
NAT64 prefix mask must be one of: /32, /40, /48, /56, /64 or 96.
.. note:: The well known NAT64 prefix is ``64:ff9b::/96``
.. stop_vyoslinter
.. csv-table::
:header: "VyOS Field", "Description"
:widths: 10,30
"valid-lifetime","Time in seconds that the prefix will remain valid (default: 65528 seconds)"
.. start_vyoslinter
Disabling Advertisements
------------------------
To disable advertisements without deleting the configuration:
.. cfgcmd:: set service router-advert interface <interface> no-send-advert
If set, the router will no longer send periodic router advertisements and
will not respond to router solicitations.
.. cfgcmd:: set service router-advert interface <interface> no-send-interval
Advertisement Interval Option (specified by Mobile IPv6) is always included in
Router Advertisements unless this option is set.
*******
Example
*******
Your LAN connected on eth0 uses prefix ``2001:db8:beef:2::/64`` with the router
beeing ``2001:db8:beef:2::1``
.. code-block:: none
set interfaces ethernet eth0 address 2001:db8:beef:2::1/64
set service router-advert interface eth0 default-preference 'high'
set service router-advert interface eth0 name-server '2001:db8::1'
set service router-advert interface eth0 name-server '2001:db8::2'
set service router-advert interface eth0 other-config-flag
set service router-advert interface eth0 prefix 2001:db8:beef:2::/64
|
