[UkOpenBSDUsers] Using 6to4 tunnels with 6.8 and newer

Stuart Henderson stu at spacehopper.org
Fri Feb 19 14:01:41 GMT 2021


On 2021/02/18 23:51, Sevan Janiyan wrote:
> Hello,
> It seems with the 6.8 release there was a change regarding IPv6,
> changelog lists
> "Set IPv6 source address selection to prefer the address with the
> highest preferred lifetime in case of a tie."
> 
> With this, if you have a 6to4 gif tunnel and the same host has a routed
> v6 address assigned to a "physical" interface (in my case it was a
> virtio vio(4) interface), that address will not be reachable. If you
> previously had a pltime value of 0 applied to the tunnel endpoint
> address on your gif interface that will also break outbound v6
> connectivity from the host it is configured on.
> 
> As a work around, you can move the routed address you had configured on
> the "physical" interface previously to the gif interface as an alias.
> Applying the pltime option to the endpoint address works fine then.
> 
> Needed this because online.net native v6 is terrible and needed the
> pltime option working so that the origin of my outbound mail matched the
> relevant DNS records.
> 
> 2021: thought about switching back to v4only on a machine.

I'm wondering if this is actually due to pltime changes or something
else. What version were you running on it before?

https://marc.info/?l=openbsd-tech&m=157580561114203




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