GRE carrying both V4 and V6 routed addresses?

jantypas

Not sure if this is routing, but there's no nice category for this :-)
Assume I have an ISP that is using a GRE tunnel to my pfSense box. They will be sending BOTH IPv4 addresses AND IPv6 addresses down the tunnel.

I know I can set up a GRE tunnel, but it appears that the assigned interface must be EITHER V4 OR V6. How can I convince it to accept BOTH V4 and V6 and have the resulting interface handle both.

jimp

Not currently possible: https://redmine.pfsense.org/issues/10392

jantypas

I thought not. Much as I'd like the ISP to set up two tunnels, they're not thrilled. Guess I'm getting a Mikrotik because that's what's on their end. It can do it.

XRM

You could try setting it up manually, like so:

ifconfig gre0 inet6 <LocalV6> <RemoteV6> prefixlen 128

I did that for my dual stack tunnel and it seems to work well so far.

… that is, until pfSense removes the v6-address again.