Public bug reported: Network manager is sending out a lot of warnings about changing the MTU: Sep 25 14:13:03 desktop NetworkManager[703]: <warn> (wlan0): Lowering IPv6 MTU (1480) to match device MTU (1280) Sep 25 14:13:21 desktop NetworkManager[703]: <warn> (wlan0): Lowering IPv6 MTU (1480) to match device MTU (0) Sep 25 14:13:21 desktop NetworkManager[703]: <warn> (wlan0): IPv6 MTU (0) smaller than 1280, adjusting Sep 25 14:13:21 desktop NetworkManager[703]: <warn> (wlan0): Raising device MTU (0) to match IPv6 MTU (1280) Sep 25 14:13:29 desktop NetworkManager[703]: <warn> (wlan0): Lowering IPv6 MTU (1480) to match device MTU (1280)
Lowering IPv6 MTU (1480) to match device MTU (1280) repeats about 16 times between the other messages (about 2 mins round). This doesn't appear to be Ubuntu specific - https://bbs.archlinux.org/viewtopic.php?pid=1552751 ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: network-manager 1.0.4-0ubuntu3 ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1 Uname: Linux 4.2.0-11-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.19-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Fri Sep 25 14:09:20 2015 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2015-01-08 (259 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150108) NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: network-manager UpgradeStatus: Upgraded to wily on 2015-08-12 (43 days ago) nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'. ** Affects: network-manager (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug wily -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1499827 Title: [ipv6] Network manager spews logs of Lowering IPv6 MTU (1480) to match device MTU (1280) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1499827/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
