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 Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1310335 Title: IPv6 renewal causes network-manager to disconnect & reconnect Status in The Linux Mint Distribution: New Status in “network-manager” package in Ubuntu: New Bug description: IPv6 renewal causes network manager to disconnect & reconnect Happens *roughly* every ten minutes. My network is running fully dual stack. The problematic option in the IPv6 part of the router's settings is "IP Address Assignment" - Use DHCP Server - Auto Config <---- Problem presents itself only when using this one I have a Netgear DGND3700v2 router, firmware version V1.1.00.15_1.00.15 (latest). There are 3 different PCs on WiFi and ethernet. Network manager settings are: one PC static IPv4, two DHCPv4 and all of them Automatic for IPv6. Linux Mint: kernel 3.2.0-60 x86 network-manager version 0.9.4.0-0ubuntu4.3 (MATE) kernel 3.5.0-48 x64 network-manager version 0.9.6.0-0ubuntu7 (Cinnamon) kernel 3.11.0-12 x64 network-manager version 0.9.8.0-0ubuntu22 (MATE) Wifi disconnection log (repeated, ethernet reconnects seem to leave no trace and seem to happen slightly less frequently): http://pastebin.com/GUdWgRUp To manage notifications about this bug go to: https://bugs.launchpad.net/linuxmint/+bug/1310335/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
