The fix for this has landed in xenial-proposed; and should transition to
xenial-release shortly with the fix. Once that is done, we can SRU the
update to the Wily release.
** Changed in: network-manager (Ubuntu)
Status: Confirmed => Fix Committed
** Also affects: network-manager (Ubuntu Wily)
Importance: Undecided
Status: New
** Changed in: network-manager (Ubuntu Wily)
Status: New => Triaged
** Changed in: network-manager (Ubuntu Wily)
Importance: Undecided => High
** Changed in: network-manager (Ubuntu Wily)
Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)
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https://bugs.launchpad.net/bugs/1499827
Title:
[ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled
Status in NetworkManager:
Fix Released
Status in network-manager package in Ubuntu:
Fix Committed
Status in network-manager source package in Wily:
Triaged
Bug description:
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'.
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