The issue is between host and vmware boxes....not guest to guest. There is a wireshark attached and you can see the boxes are sending packets much larger than the interfaces MTU (15914 bytes)
See ipv6-filtered.pcap -- TCP uses wrong MTU/MSS size for IPv6 https://bugs.launchpad.net/bugs/254622 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs