Router Advertisements

Supported interface types:

To enable or disable, use

set interfaces <interface> ipv6 router-advert send-advert <true or false>

To set the options described in "Router Advertisement Message Format", start from

set interfaces <interface> ipv6 router-advert

With sub-options:

RFC Field	VyOS Config Option
Cur Hop Limit	cur-hop-limit
"Managed address configuration" flag	managed-flag
"Other configuration" flag	other-config-flag
Router Lifetime	default-lifetime
Reachable Time	reachable-time
Retrans Timer	retrans-timer
MTU	link-mtu
Prefix Information	See below

Prefix Information

To set the fields described, start from

set interfaces <interface> ipv6 router-advert prefix <h:h:h:h:h:h:h:h/x>

With sub-options:

RFC Field	VyOS Config Option
Prefix Length	'x' in <h:h:h:h:h:h:h:h/x>
on-link flag	on-link-flag
autonomous address-configuration flag	autonomous-flag
Valid Lifetime	valid-lifetime
Preferred Lifetime	preferred-lifetime

Starting from

set interfaces <interface> ipv6 router-advert

There are the following additional options:

default-preference - set low, medium, or high default router preference per https://tools.ietf.org/html/rfc4191
min-internal/max-interval - min and max interval between unsolicited multicast RAs
name-server: advertise DNS server per https://tools.ietf.org/html/rfc6106

To receive and accept RAs on an interface, you need to enable it via sysctl with the following command (as root):

sysctl -w net.ipv6.conf.eth0.accept_ra=2

The change is not reboot-persistent, so it either needs to be redone every time or added to rc.d.