Public bug reported: ### More info: http://serverfault.com/questions/820689/tcp-handshake-error-syn-and-syn-ack-packets-are-not-recognised/
### Kernel version ```bash # uname -a Linux docker-host 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ``` ### Step to reproduce: - I use proxmox hypervisor and create virtual machine with virtio nic - Take ubuntu-server 16.04.1 https://www.ubuntu.com/download/server/thank-you?version=16.04.1&architecture=amd64 - Install in minimal installation - Execute: ```bash # ip link add link ens18 name ens18.111 type vlan id 111 # ip addr add 192.168.111.80/24 dev ens18.111 # ip link set ens18.111 up # ping 192.168.111.1 PING 192.168.111.1 (192.168.111.1) 56(84) bytes of data. 64 bytes from 192.168.111.1: icmp_seq=1 ttl=64 time=17.9 ms 64 bytes from 192.168.111.1: icmp_seq=2 ttl=64 time=18.8 ms 64 bytes from 192.168.111.1: icmp_seq=3 ttl=64 time=18.5 ms ^C --- 192.168.111.1 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 17.932/18.455/18.841/0.414 m # nslookup > server 192.168.111.1 Default server: 192.168.111.1 Address: 192.168.111.1#53 > google.com Server: 192.168.111.1 Address: 192.168.111.1#53 Non-authoritative answer: Name: google.com Address: 173.194.222.139 Name: google.com Address: 173.194.222.113 Name: google.com Address: 173.194.222.100 Name: google.com Address: 173.194.222.102 Name: google.com Address: 173.194.222.138 Name: google.com Address: 173.194.222.101 > type cv Server: 192.168.111.1 Address: 192.168.111.1#53 ** server can't find type: NXDOMAIN > google.com ;; connection timed out; no servers could be reached ^C ``` I tested this issue on arch linux iso and it's work properly ```bash # uname -a Linux archiso 4.8.11-1-ARCH #1 SMP PREEMPT SUN Nov 27 09:26:14 CET 2016 x86_64 FNU/Linux ``` ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1652946 Title: Vlan on physical interface breaks TCP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1652946/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
