TCP traffic in ipip tunnel inside wireguard connection

[Jörg Thalheim]

Like Jason said, multiple wireguard interfaces are the way to go here.
You can then set up your routing protocols on top.

On 2017-05-29 21:57, Ivan Leonardo wrote:
> Hello
>
> Recently i have been experimenting with wireguard, and in fact the performance in wg is better than the ipsec tunnels i have. In my ipsec implementation i'm using vti interfaces(SAs 0.0.0.0/0) and i can select the traffic flow with static/dynamic routing.
>
> Knowing that wg doesn't allow multiple tunnels with allowedip=0.0.0.0/0,  i tried to create a ipip tunnel using the wg endpoint tunnel ips. I don't have problems with UDP/ICMP traffic, but with TCP when a host(192.168.1.110) in lan1 tries to communicate with the ip of the ipip tunnel in server2, the returning tcp traffic has bad tcp checksum and the packets are discarded. If i try to send tcp packets with the source ip of the ipip tunnel of server2 to host(192.168.1.110) in lan1 , in tcpdump in server2 i see the tcp packets, but in the tcpdump in server1 i dont see the packets.
>
> Resuming, in this topology i only have problems with tcp traffic, udp and icmp works fine.
>
>
> I have search the web for this use case, but didn't find anyone using it, in this topic https://forum.freifunk.net/t/wireguard-0-0-20161230-linuxkernel-3-18-gluon-v2016-2-2/14122 , they managed to get a gre/gretap tunnel functioning with wg.
>
> Does anyone have any ideia if its possible to use this topology?
>
> Topology:
>
> 172.16.17.2/30                  172.16.17.1/30
>            wg0(172.16.17.0/30)
> Server2  <----------------------> Server1   <----> lan1 (192.168.1.0/24)
>             <--------------->
>           ipip0(172.18.0.0/30)(remote/local = wireguard tunnel endpoints)
> 172.18.0.2/30                 172.18.0.1/30
>
> Servers specs:
>
> Server1/2 Ubuntu 16.04.02 (Kernel 4.4.0-78-generic)
> WG version: 0.0.20170517-wg2~xenial
>
>
> Best regards.
>
>
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