After further investigation ;) and testing the problem seems a little bit more clear.
We've installed windows 2012r2 on the same server to be sure not having a potential hardware problem - !! On windows the same problem exists !! Than we changed the switch. At first, there was a netgear 8port unmanaged switch to a netgear 8+2port managed switch. No problem on windows neither a problem on linux with the managed switch (Release Notes Intel Driver - potential problem with unamanaged switches). No plug/unplug problem, no lost packets and not a wrong packet counter anymore. So all fine ? ... allmost The wrong packet counter and some of the misbehaviour on plug/unplug and also lost packets seems to come FROM THE SAME NETWORK ON BOTH INTERFACES !! Problem configuration 1: eth0 192.168.86.11/24 eth0:0 172.22.1.81/24 dhcp: eth1 172.22.1. 243/24 ping test to 172.22.1.81 and 172.22.1. 243 ------------------------------------------------------------------ Problem configuration 2: eth0 172.22.1.81/24 dhcp: eth1 172.22.1. 243/24 ping test to 172.22.1.81 and 172.22.1. 243 ------------------------------------------------------------------ Working configuration: eth0 192.168.86.11/24 dhcp: eth1 172.22.1. 243/24 ping test to 192.168.86.11 and 172.22.1. 243 ... so there seems to be a general bug left in network stack/logic of the kernel ... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1370018 Title: igb driver does not initialize network cards - no link intel I210 rev03 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1370018/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
