I think this is the same bug that just caused my network connections to go haywire after a system update. Kubuntu 14.04 LTS, kernel 3.13.0-24.
In my case, both ethernet and WiFi were disconnecting and reconnecting about once a minute. I eventually discovered that if I edited the network configuration using KDE's plasma widget, and turned off the option "IPv6 is required for this connection", the network connections would stop cycling repeatedly -- but IPv6 would still work! Looking at syslog, it appears that NetworkManager is trying to use DHCP6 all the time, even when I've configured the IPv6 connection method to be "Automatic (Only addresses)" rather than "Automatic (DHCP)". Since I have a normal IPv6 network using stateless autoconfig with no need for DHCP6 and no DHCP6 server, this causes a DHCP6 timeout, and NetworkManager decides that's a good reason to kill the IPv4 connection as well. With "IPv6 is required" turned off, NetworkManager *still* tries to use DHCP6 and fails, but ignores the failure and then apparently succeeds in configuring IPv6 normally via stateless autoconfig. As in, I can ping6 IPv6 hosts. My last network-manager update was 2014-04-22, so I'm thinking some other change has tickled this new misbehavior. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1310335 Title: IPv6 renewal causes network-manager to disconnect & reconnect To manage notifications about this bug go to: https://bugs.launchpad.net/linuxmint/+bug/1310335/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
