pfSense, IPv6, virtualized on dedicated server

Hi there,

Some notes, helping those that also suffers with IPv6 on OVH's setup, especially with pfSense

{NETBLOCK}: 2001:41d0:xxxx:xxxx::/64
{GATEWAY}: 2001:41d0:xxxx:xxff:ff:ff:ff:ff

1) Create a gateway, let's call it "OVH-ipv6"
At the bottom, after opening the Advanced settings, there is an advanced setting that you want to enable:
**Use non-local gateway** (The explanation should explain....)
2) WAN Interface configured with static IP in {NETBLOCK}, select the gateway "OVH-ipv6" for the IPv6 default gateway
3) FreeBSD/pfSense (at least 2.4.2 & 2.4.2_1) seems to ignore the {GATEWAY}'s ICMP6, neighbor solicitation, and neither does it seem to request/solicit those NDP messages :frowning:

The solution (thus far for me):
**ndp -s 2001:41d0:xxxx:xxff:ff:ff:ff:ff 00:ff:ff:ff:ff:fc**

However, it seems that the actual traffic for the NDP originates from 2001:41d0:xxxx:xxff:ff:ff:ff:fe or 2001:41d0:xxxx:xxff:ff:ff:ff:fd, which necessitates some extra routing and ndp entries ;(

ndp -s 2001:41d0:xxxx:xxff:ff:ff:ff:fe 00:ff:ff:ff:ff:fc
ndp -s 2001:41d0:xxxx:xxff:ff:ff:ff:fd 00:ff:ff:ff:ff:fd

route add -inet6 ndp -s 2001:41d0:xxxx:xxff:ff:ff:ff:fe -iface {WAN_INT}
route add -inet6 ndp -s 2001:41d0:xxxx:xxff:ff:ff:ff:fd -iface {WAN_INT}

Problems:
This is assumed the MAC addresses of the OVH routers stays the same/similar.

/me wishes for **routed** IPv6 options from OVH ;(