IPv6: VyOS: Router Advertisement
Revision as of 08:26, 21 January 2019 by Onnowpurbo (talk | contribs) (Created page with "= Router Advertisements = Router advertisements are described in https://tools.ietf.org/html/rfc4861#section-4.2 .<br> Supported interface types: * bonding * bridge * etherne...")
Router Advertisements
Router advertisements are described in https://tools.ietf.org/html/rfc4861#section-4.2 .
Supported interface types:
- bonding
- bridge
- ethernet
- l2tpv3
- openvpn
- psuedo-ethernet
- tunnel
- vxlan
- wireless
- wirelessmodem
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
Prefix information is described in https://tools.ietf.org/html/rfc4861#section-4.6.2
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 |
Miscellaneous Options
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
Receiving Router Advertisements
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.