desktop-packages team mailing list archive

[Bryan Quigley <bryan.quigley@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1499827

Title:
  [ipv6] Network manager spews logs of Lowering IPv6 MTU (1480) to match
  device MTU (1280)

Status in network-manager package in Ubuntu:
  New

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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