Hello, I have problem, i have bridge between ethernet interface and tuntap interface application <-> tap0 Bridge0 eth0 <-> Network everythings seem to be OK, bridge is bridging correctly, but when application do connect to some destination first Syn paket i see on tap0 if, and i see it on eth0 if, it goes to destination. The return Syn/Ack paket from destination i see on eth0, but not goes through bridge0 if to the tap0 interface. Application connect times out (3 seconnds ) and send second Syn packet and receive Syn/ack , handshake complete and everything goes correctly. But for every connection initiated by application is situation same. tcpdump on eth0: 11:02:18.941680 IP 10.1.2.2.38894 > 195.28.64.118.25: S 1905693472:1905693472 (0) win 5840 <mss 1460,sackOK,timestamp 605391412 0,nop,wscale 2> 11:02:19.043882 IP 195.28.64.118.25 > 10.1.2.2.38894: S 3816891714:3816891714 (0) ack 1905693473 win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 2989341090 605391412,sackOK,eol> 11:02:21.938529 IP 10.1.2.2.38894 > 195.28.64.118.25: S 1905693472:1905693472 (0) win 5840 <mss 1460,sackOK,timestamp 605392162 0,nop,wscale 2> 11:02:22.030111 IP 195.28.64.118.25 > 10.1.2.2.38894: S 3816891714:3816891714 (0) ack 1905693473 win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 2989344076 605392162,sackOK,eol> 11:02:22.030204 IP 10.1.2.2.38894 > 195.28.64.118.25: . ack 1 win 1460 <nop,nop,timestamp 605392184 2989344076> 11:02:22.410047 IP 195.28.64.118.25 > 10.1.2.2.38894: P 1:41(40) ack 1 win 33304 <nop,nop,timestamp 2989344445 605392184> tcpdump on tap0: 11:02:18.941468 IP 10.1.2.2.38894 > 195.28.64.118.25: S 1905693472:1905693472 (0) win 5840 <mss 1460,sackOK,timestamp 605391412 0,nop,wscale 2> 11:02:21.938516 IP 10.1.2.2.38894 > 195.28.64.118.25: S 1905693472:1905693472 (0) win 5840 <mss 1460,sackOK,timestamp 605392162 0,nop,wscale 2> 11:02:22.030119 IP 195.28.64.118.25 > 10.1.2.2.38894: S 3816891714:3816891714 (0) ack 1905693473 win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 2989344076 605392162,sackOK,eol> 11:02:22.030198 IP 10.1.2.2.38894 > 195.28.64.118.25: . ack 1 win 1460 <nop,nop,timestamp 605392184 2989344076> 11:02:22.410055 IP 195.28.64.118.25 > 10.1.2.2.38894: P 1:41(40) ack 1 win 33304 <nop,nop,timestamp 2989344445 605392184> 11:02:22.410490 IP 10.1.2.2.38894 > 195.28.64.118.25: . ack 41 win 1460 <nop,nop,timestamp 605392279 2989344445> 11:02:40.269133 IP 10.1.2.2.38894 > 195.28.64.118.25: F 1:1(0) ack 41 win 1460 <nop,nop,timestamp 605396743 2989344445> tcpdump on bridge0: 11:02:18.941588 IP 10.1.2.2.38894 > 195.28.64.118.25: S 1905693472:1905693472 (0) win 5840 <mss 1460,sackOK,timestamp 605391412 0,nop,wscale 2> 11:02:21.938516 IP 10.1.2.2.38894 > 195.28.64.118.25: S 1905693472:1905693472 (0) win 5840 <mss 1460,sackOK,timestamp 605392162 0,nop,wscale 2> 11:02:22.030111 IP 195.28.64.118.25 > 10.1.2.2.38894: S 3816891714:3816891714 (0) ack 1905693473 win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 2989344076 605392162,sackOK,eol> 11:02:22.030198 IP 10.1.2.2.38894 > 195.28.64.118.25: . ack 1 win 1460 <nop,nop,timestamp 605392184 2989344076> 11:02:22.410047 IP 195.28.64.118.25 > 10.1.2.2.38894: P 1:41(40) ack 1 win 33304 <nop,nop,timestamp 2989344445 605392184> 11:02:22.410490 IP 10.1.2.2.38894 > 195.28.64.118.25: . ack 41 win 1460 <nop,nop,timestamp 605392279 2989344445> Thanks for any help/guidance! Barto