Seems likely the wrong source IP is being used for sending the ping. Use tcpdump on the initiating computer to make sure the source IP of the ping packet matches the allowed-ips of the other machine. -- Sent from my telephone. On Sep 20, 2017 17:11, "nicolas prochazka" wrote: Hello, can somebody tells me what I do wrong : I can ping from server 1 --> client 1 ( ping fd00:14::8b5:8aff:fe85:f3ee ) . but not from client 1 --> server1 ( ping fd00:14::8b5:8aff:fe85:f3ec ) we can notice RX packets:230 errors:1112 dropped:0 overruns:0 frame:1112 on server side seems strange wireguard : v0.0.20170918] kernel : 4.9.23 on client1 kernel : 4.4.0 on server 1 Regards, Nicolas Prochazka Server 1 : ifconfig neocoretech_rd neocoretech_rd Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet6 addr: fd00:14::8b5:8aff:fe85:f3ec/32 Scope:Global UP POINTOPOINT RUNNING NOARP MTU:1420 Metric:1 RX packets:230 errors:1112 dropped:0 overruns:0 frame:1112 TX packets:390 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:24672 (24.6 KB) TX bytes:39104 (39.1 KB) [52.209.226.5]~/resources/tunnelHelper>wg showconf neocoretech_rd [Interface] ListenPort = 6081 PrivateKey = mNHgDu3Nbusb3Xd8tI8imBkFgvnUSCjKGVP5qT8pi2Q= [Peer] PublicKey = 5zSx+CxgcjLKE2shpkTrLFgCHNOPM6r7TcuZ5cSx2AA= AllowedIPs = fd00:14::8b5:8aff:fe85:f3ee/128 Endpoint = 77.156.254.18:25813 wg show neocoretech_rd interface: neocoretech_rd public key: lrJtbn/Jfdb1NyIP78ls11uqAzjcWzDuD+x05RxFk20= private key: (hidden) listening port: 6081 peer: 5zSx+CxgcjLKE2shpkTrLFgCHNOPM6r7TcuZ5cSx2AA= endpoint: 77.156.254.18:25813 allowed ips: fd00:14::8b5:8aff:fe85:f3ee/128 latest handshake: 1 minute, 10 seconds ago transfer: 23.95 KiB received, 36.07 KiB sent Client 1 : ifconfig wg0 wg0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet6 addr: fd00:14::8b5:8aff:fe85:f3ee/8 Scope:Global UP POINTOPOINT RUNNING NOARP MTU:1420 Metric:1 RX packets:230 errors:0 dropped:0 overruns:0 frame:0 TX packets:1366 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:23632 (23.0 KiB) TX bytes:230352 (224.9 KiB) [optimizer] wg showconf wg0 [Interface] ListenPort = 6081 PrivateKey = IM0tv9xWcVBPhD7+Tny7LHnYu1YHBGCJbBr6fgCdZns= [Peer] PublicKey = lrJtbn/Jfdb1NyIP78ls11uqAzjcWzDuD+x05RxFk20= AllowedIPs = ::/0 Endpoint = 52.209.226.5:6081 PersistentKeepalive = 25 wg show wg0 interface: wg0 public key: 5zSx+CxgcjLKE2shpkTrLFgCHNOPM6r7TcuZ5cSx2AA= private key: (hidden) listening port: 6081 peer: lrJtbn/Jfdb1NyIP78ls11uqAzjcWzDuD+x05RxFk20= endpoint: 52.209.226.5:6081 allowed ips: ::/0 latest handshake: 37 seconds ago transfer: 22.99 KiB received, 215.96 KiB sent persistent keepalive: every 25 seconds _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard