Hi all,

I have setup Wireguard on a Gentoo box, compiled it into the kernel
using instructions on the wireguard website. Got my mobile to connect
using 4G to this box fine, so I wanted to test further with a friend of
mine who has a DD-wrt installation on his router. Wireguard is
integrated into the DD-wrt build, we set it up, but the tunnel does not
come up. On the server I only see this:

Oct  9 16:45:34 omega kernel: [178809.449718] wireguard: wg0: Receiving
handshake initiation from peer 10 (x.169.86.x:22300)
Oct  9 16:45:34 omega kernel: [178809.449721] wireguard: wg0: Sending
handshake response to peer 10 (x.169.86.x:22300)
Oct  9 16:45:34 omega kernel: [178809.450130] wireguard: wg0: Keypair
32179 destroyed for peer 10
Oct  9 16:45:34 omega kernel: [178809.450131] wireguard: wg0: Keypair
32180 created for peer 10
Oct  9 16:45:39 omega kernel: [178814.519668] wireguard: wg0: Receiving
handshake initiation from peer 10 (x.169.86.x:22300)
Oct  9 16:45:39 omega kernel: [178814.519671] wireguard: wg0: Sending
handshake response to peer 10 (x.169.86.x:22300)
Oct  9 16:45:39 omega kernel: [178814.520062] wireguard: wg0: Keypair
32180 destroyed for peer 10
Oct  9 16:45:39 omega kernel: [178814.520063] wireguard: wg0: Keypair
32181 created for peer 10
Oct  9 16:45:44 omega kernel: [178819.579701] wireguard: wg0: Receiving
handshake initiation from peer 10 (x.169.86.x:22300)
Oct  9 16:45:44 omega kernel: [178819.579704] wireguard: wg0: Sending
handshake response to peer 10 (x.169.86.x:22300)
Oct  9 16:45:44 omega kernel: [178819.580094] wireguard: wg0: Keypair
32181 destroyed for peer 10
Oct  9 16:45:44 omega kernel: [178819.580095] wireguard: wg0: Keypair
32182 created for peer 10
Oct  9 16:45:50 omega kernel: [178824.910142] wireguard: wg0: Receiving
handshake initiation from peer 10 (x.169.86.x:22300)
Oct  9 16:45:50 omega kernel: [178824.910145] wireguard: wg0: Sending
handshake response to peer 10 (x.169.86.x:22300)
Oct  9 16:45:50 omega kernel: [178824.910535] wireguard: wg0: Keypair
32182 destroyed for peer 10
Oct  9 16:45:50 omega kernel: [178824.910536] wireguard: wg0: Keypair
32183 created for peer 10
Oct  9 16:45:55 omega kernel: [178829.950001] wireguard: wg0: Receiving
handshake initiation from peer 10 (x.169.86.x:22300)
Oct  9 16:45:55 omega kernel: [178829.950003] wireguard: wg0: Sending
handshake response to peer 10 (x.169.86.x:22300)
Oct  9 16:45:55 omega kernel: [178829.950406] wireguard: wg0: Keypair
32183 destroyed for peer 10
Oct  9 16:45:55 omega kernel: [178829.950407] wireguard: wg0: Keypair
32184 created for peer 10

Port on the server is open (since the 4G test works). We can reach the
22300 port on his side. Checked the pub/private keys as well.

wg show on server:

interface: wg0
  public key: <pubkey server>
  private key: (hidden)
  listening port: 51820

peer: <pubkey of mobile>
  endpoint: x.200.39.x:8971
  allowed ips: 0.0.0.0/0
  latest handshake: 8 hours, 1 minute, 43 seconds ago
  transfer: 384.24 KiB received, 2.74 MiB sent

peer: <pubkey of dd-wrt>
  endpoint: x.169.86.x:22300
  allowed ips: 192.168.1.0/24, 10.100.0.3/32
  transfer: 2.00 MiB received, 1.24 MiB sent

On DD-wrt router:

interface: oet1
  public key: <pubkey dd-wrt>
  private key: (hidden)
  listening port: 22300

peer: <pubkey of server>
  endpoint: x.197.199.x:51820
  allowed ips: 0.0.0.0/0
  transfer: 0 B received, 777.43 KiB sent
  persistent keepalive: every 25 seconds

We are trying to get logging to work on that DD-wrt box, that should
contain some more clues but maybe any of you have an idea?

Cheers,

Dennis