Re: ipv6 gateway on different subnet

[Christof Meerwald <cmeerw%cmeerw.org@localhost>]

On Wed, Jan 22, 2025 at 07:37:24PM -0600, Peter Miller wrote:
> On Wed, Jan 22, 2025 at 3:23 PM Christof Meerwald <cmeerw%cmeerw.org@localhost> wrote:
> 
> > Want to try the attached patch to make NetBSD send a neighbor
> > advertisement that's similar to the one Linux sends to see if that
> > makes it work? (the patch seems to work on my VPS - although it
> > doesn't really make a difference there)
> >
> > BTW, my wild guess would be that your VPS provider is too aggressively
> > filtering neighbor advertisements (so only allow those that Linux
> > would send).
> 
> Woot! That appears to have worked. I've waited a while to see if
> anything breaks, but it's all working great.

Great!

It might be worth asking your VPS provider about that. I guess what
they are trying to do is to filter any neighbor advertisements for
IPv6 addresses that are not assigned to your VPS (but also filter
neighbor advertisements with a link-local source address - instead of
just looking at the target address of the neighbor advertisement).

It might also be worth raising a NetBSD PR for this - maybe the change
is worth applying in any case (at least it simplifies the code - I am
not sure there could be any cases where you wouldn't want to do it
that way). Not sure what other BSDs do here.


Christof

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