netdev - FW: gretap tunnel redirecting 2 different networks on destination host

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Message-ID: <"H000007100114876.1522730023.sx.f1-outsourcing.eu*"@MHS>
Date:   Tue, 3 Apr 2018 06:33:43 +0200
From:   "Marc Roos" <M.Roos@...outsourcing.eu>
To:     netdev <netdev@...r.kernel.org>
Subject: FW: gretap tunnel redirecting 2 different networks on destination host

I see you are quite busy with discussing the patches etc. If this is the 
incorrect place to ask for a little help please let me know. I just got 
this from some one on stack overflow who got some answers here.

-----Original Message-----
Subject: gretap tunnel redirecting 2 different networks on destination 
host

How can I get the 10.11.12.x traffic received on tun1 at server B to 
eth2, and 172.16.1.x to eth1? 

I have a server A that sends 172.16.1.x and 10.11.12.x traffic via a 
gretab tunnel 192.168.1.x to server B.

            +-------------+                             +------------+
 172.16.1.x |      B      |                             |      A     |
     -------|eth1         |         192.168.1.x GRETAP  |            |
            |         tun1|-----------------------------|tun1        |
 10.11.12.x |             |                             |            |
     -------|eth2         |                             |            |
            +-------------+                             +------------+

When I put the tun1 interface of server B in a bridge with eth1 I am 
able to ping several 172.16.1.x ip's from server A. And communication on 

this network seems to be ok

- I cannot put eth2 on the same bridge. 
- I thought of creating a 2nd gretab tunnel and use each tunnel for a 
network, but I think there is probably a better solution.