Hello, there are actually no replies at all, which is why I *assumed* that the packets do not actually arrive at the wireguard code.
How does wireguard integrate into the kernel / netfilter flow? Or in other words, how is the expected behaviour of something like what I am trying to do? Best, Nico p.s.: I was also thinking about needing SNAT, but I don't see any replies generated at the moment. Ivan Labáth <labawi...@matrix-dream.net> writes: > Hello, > > have you checked the source port of replies, or whether > there are any replies? > > # tcpdump -nn > > Tcpdump should show pre-NAT addresses on incoming packets > and AFAIK post-NAT on outgoing packets, i.e. what goes on > the wire. > > You might need to apply SNAT on outgoing packets, which > might happen automatically with TCP connection tracking, > but I wouldn't really expect it on connection-less UDP. > > Regards, > Ivan > > On Thu, Nov 07, 2019 at 05:38:42PM +0100, Nico Schottelius wrote: >> >> Hello, >> >> I am experimenting with nft / netfilter redirects to support wireguard >> packets on *any* udp port. I tried using the following configuration for >> nftables: >> >> [17:34:14] vpn-2a0ae5c1:~# cat /etc/nftables.conf >> #!/usr/sbin/nft -f >> >> flush ruleset >> >> table ip nat { >> chain prerouting { >> type nat hook prerouting priority 0; >> >> # SSH works >> tcp dport != 22 redirect to 22 >> >> # wireguard doesn't >> udp dport != 51820 redirect to 51820 >> } >> >> chain postrouting { >> type nat hook postrouting priority 0; >> } >> } >> >> However as you can see in the comments, this does not work with >> wireguard, however it does work with SSH. >> >> I can see that wireguard is kernel space, and ssh user space, but does >> that cause the netfilter part to be skipped or am I doing some silly >> mistake here? >> >> Best regards, >> >> Nico >> >> >> -- >> Modern, affordable, Swiss Virtual Machines. Visit www.datacenterlight.ch >> _______________________________________________ >> WireGuard mailing list >> WireGuard@lists.zx2c4.com >> https://lists.zx2c4.com/mailman/listinfo/wireguard -- Modern, affordable, Swiss Virtual Machines. Visit www.datacenterlight.ch _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard