On a Linux 3.2 kernel: Linux 3.2.0-4-686-pae #1 SMP Debian 3.2.46-1+deb7u1 i686 GNU/Linux on VmWare, i get checksum errors on ipv6 tcp packets.
So I can ping6, but not connect by ipv6 to ssh, smtp, html etc.
I believe, according to http://www.tunnelbroker.net/forums/index.php?topic=2826.0 I have to disable checksum offloading.
I'm supposed to do use this, but it doesn't work.
host:~# ethtool --offload eth0 rx off tx off Cannot change rx-checksumming Cannot change tx-checksumming Could not change any device features host:~# ethtool -K eth0 gso off Could not change any device features
Hosts with 2.6 kernel does not have this problem; server was ok until upgraded to a 3.2 kernel.