FR: interface ListenAddress (Aka:Multihomed server issue)

[Jan De Landtsheer]

basically this is what happens:
client connects to 134.56.78.5:443
wg show gives:
peer 111.22.33.25:443


 +----------------------+
                                                       |
   |
                                      +----------------+      client
   |
                                      |                |   81.82.222.111/18
(fixed IP)
                                  XXXX++XX             |
   |
                            XXXXXX        XXX
 +----------------------+
                          XX  X              XX
                          X     internet      X          client config:
                          X X                XX            [interface]
                               XX           XX             peer
134.56.78.5:443
               111.22.33.26/30  |XXX      XX
                default gateway |   XXXXXXX
                                |
                                |                        after connect:
                     UPLINK     |                        wg show
                                |                          peer
111.22.33.25:443
                                |
            +-------------------+-------------------+
            |    eth1:111.22.33.25/30               |
            |                                       |
            |       router  = wg server             |
            |                                       |
            |    eth0: 134.56.78.1/24 deft gw for 134.56.78.0/24
            |    eth0: 134.56.78.5/24 a free ip with open port for 443 (wg
destination)
            +----------------+----------------------+
                             |
                             |
                             |
                             |
                             |
+----------------------------+--------------------------------+ also
134.56.78.0/24

no nat at all in this setup only some firewall filtering

Jan

On Thu, Aug 10, 2017 at 8:40 PM Jason A. Donenfeld <Jason at zx2c4.com> wrote:

> Hi Jan,
>
> So it looks like this is happening to you:
>
>
> This should not be the behavior, and if it is, you've either found a bug
> in WireGuard or a bug in your own setup.
>
> 1) Are you running the latest snapshot of WireGuard? Which one?
> 2) "but I don’t know for sure… it seems to be a regression somewhere as I
> don’t recall to have that problem before…" Can you be more precise?
> 3) If you are running the latest version, does this patch fix it?
> http://ix.io/z3d
> 4) Can you confirm that there exists a route from the server back to the
> client?
>
> Thanks,
> Jason
> ​
>
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