[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Launchpad Bug Tracker]

This bug was fixed in the package network-manager - 1.0.4-0ubuntu5.2

---
network-manager (1.0.4-0ubuntu5.2) wily; urgency=medium

  * debian/patches/lp1499827_device_avoid_undefined_mtu_c44069c1.patch
Cherry-pick commit c44069c1 from upstream: avoid changing the MTU if it's
undefined in NM code. (LP: #1499827)
  * debian/patches/lp1499827_dont_change_unset_mtu_a92d8b0c.patch:
Cherry pick upstream commit a92d8b0c: don't change the MTU if we have a
value of 0 for it; it means "default", not "0 size packets". (LP: #1499827)

 -- Mathieu Trudel-Lapierre   Fri, 27 Nov 2015
14:03:32 -0500

** Changed in: network-manager (Ubuntu Wily)
   Status: Fix Committed => Fix Released

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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 Released
Status in network-manager source package in Wily:
  Fix Released

Bug description:
  [Impact]
  Users with IPv6-supporting networks will see the messages below in the bug 
description appear repeatedly as NM mistakes a 0 value for MTU in internal NM 
code with 0-size packets instead of meaning "use default MTU".

  [Test case]
  - Run network-manager on a network supporting IPv6.
  - Check /var/log/syslog for  messages from NetworkManager.

  [Regression Potential]
  This changes behavior for handling the MTU value for IPv6, which should be no 
higher than the device MTU. Since 0 is an invalid value for MTU anyway, this 
should not otherwise affect MTU handling for devices.
  Possible regressions from the change might include invalid (too high) set MTU 
for a device due to the failure to recognize cases where the MTU needs to be 
adjusted, leading to packet loss on IPv6.

  --

  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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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[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Pedro Morales]

The package in proposed is working for me.
I no longer need to set MTU by hand for the wireless to connect

-- 
You received this bug notification because you are a member of Desktop
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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 Released
Status in network-manager source package in Wily:
  Fix Committed

Bug description:
  [Impact]
  Users with IPv6-supporting networks will see the messages below in the bug 
description appear repeatedly as NM mistakes a 0 value for MTU in internal NM 
code with 0-size packets instead of meaning "use default MTU".

  [Test case]
  - Run network-manager on a network supporting IPv6.
  - Check /var/log/syslog for  messages from NetworkManager.

  [Regression Potential]
  This changes behavior for handling the MTU value for IPv6, which should be no 
higher than the device MTU. Since 0 is an invalid value for MTU anyway, this 
should not otherwise affect MTU handling for devices.
  Possible regressions from the change might include invalid (too high) set MTU 
for a device due to the failure to recognize cases where the MTU needs to be 
adjusted, leading to packet loss on IPv6.

  --

  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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'.

To manage notifications about this bug go to:
https://bugs.launchpad.net/network-manager/+bug/1499827/+subscriptions

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[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Bryan Quigley]

** Tags removed: verification-needed
** Tags added: verification-done

-- 
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/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 Released
Status in network-manager source package in Wily:
  Fix Committed

Bug description:
  [Impact]
  Users with IPv6-supporting networks will see the messages below in the bug 
description appear repeatedly as NM mistakes a 0 value for MTU in internal NM 
code with 0-size packets instead of meaning "use default MTU".

  [Test case]
  - Run network-manager on a network supporting IPv6.
  - Check /var/log/syslog for  messages from NetworkManager.

  [Regression Potential]
  This changes behavior for handling the MTU value for IPv6, which should be no 
higher than the device MTU. Since 0 is an invalid value for MTU anyway, this 
should not otherwise affect MTU handling for devices.
  Possible regressions from the change might include invalid (too high) set MTU 
for a device due to the failure to recognize cases where the MTU needs to be 
adjusted, leading to packet loss on IPv6.

  --

  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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'.

To manage notifications about this bug go to:
https://bugs.launchpad.net/network-manager/+bug/1499827/+subscriptions

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[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Chris J Arges]

Hello Bryan, or anyone else affected,

Accepted network-manager into wily-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/network-
manager/1.0.4-0ubuntu5.2 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: network-manager (Ubuntu Wily)
   Status: Triaged => Fix Committed

** Tags added: verification-needed

-- 
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/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 Released
Status in network-manager source package in Wily:
  Fix Committed

Bug description:
  [Impact]
  Users with IPv6-supporting networks will see the messages below in the bug 
description appear repeatedly as NM mistakes a 0 value for MTU in internal NM 
code with 0-size packets instead of meaning "use default MTU".

  [Test case]
  - Run network-manager on a network supporting IPv6.
  - Check /var/log/syslog for  messages from NetworkManager.

  [Regression Potential]
  This changes behavior for handling the MTU value for IPv6, which should be no 
higher than the device MTU. Since 0 is an invalid value for MTU anyway, this 
should not otherwise affect MTU handling for devices.
  Possible regressions from the change might include invalid (too high) set MTU 
for a device due to the failure to recognize cases where the MTU needs to be 
adjusted, leading to packet loss on IPv6.

  --

  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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'.

To manage notifications about this bug go to:
https://bugs.launchpad.net/network-manager/+bug/1499827/+subscriptions

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[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Launchpad Bug Tracker]

This bug was fixed in the package network-manager - 1.0.4-0ubuntu7

---
network-manager (1.0.4-0ubuntu7) xenial; urgency=medium

  * debian/patches/lp1499827_device_avoid_undefined_mtu_c44069c1.patch
Cherry-pick commit c44069c1 from upstream: avoid changing the MTU if it's
undefined in NM code. (LP: #1499827)
  * debian/patches/lp1499827_dont_change_unset_mtu_a92d8b0c.patch:
Cherry pick upstream commit a92d8b0c: don't change the MTU if we have a
value of 0 for it; it means "default", not "0 size packets". (LP: #1499827)

 -- Mathieu Trudel-Lapierre   Tue, 24 Nov 2015
16:13:37 -0500

** Changed in: network-manager (Ubuntu)
   Status: Fix Committed => Fix Released

-- 
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/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 Released
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]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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'.

To manage notifications about this bug go to:
https://bugs.launchpad.net/network-manager/+bug/1499827/+subscriptions

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[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Mathieu Trudel-Lapierre]

Uploaded network-manager 1.0.4-0ubuntu5.2 to wily-proposed for review
and approval by the SRU team.

** Description changed:

+ [Impact]
+ Users with IPv6-supporting networks will see the messages below in the bug 
description appear repeatedly as NM mistakes a 0 value for MTU in internal NM 
code with 0-size packets instead of meaning "use default MTU".
+ 
+ [Test case]
+ - Run network-manager on a network supporting IPv6.
+ - Check /var/log/syslog for  messages from NetworkManager.
+ 
+ [Regression Potential]
+ This changes behavior for handling the MTU value for IPv6, which should be no 
higher than the device MTU. Since 0 is an invalid value for MTU anyway, this 
should not otherwise affect MTU handling for devices.
+ Possible regressions from the change might include invalid (too high) set MTU 
for a device due to the failure to recognize cases where the MTU needs to be 
adjusted, leading to packet loss on IPv6.
+ 
+ --
+ 
  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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
+ 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
+  # 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
+  [main]
+  NetworkingEnabled=true
+  WirelessEnabled=true
+  WWANEnabled=true
+  WimaxEnabled=true
  RfKill:
-  0: phy0: Wireless LAN
-   Soft blocked: no
-   Hard blocked: no
+  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'.

-- 
You received this bug notification because you are a member of Desktop
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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 Released
Status in network-manager source package in Wily:
  Triaged

Bug description:
  [Impact]
  Users with IPv6-supporting networks will see the messages below in the bug 
description appear repeatedly as NM mistakes a 0 value for MTU in internal NM 
code with 0-size packets instead of meaning "use default MTU".

  [Test case]
  - Run network-manager on a network supporting IPv6.
  - Check /var/log/syslog for  messages from NetworkManager.

  [Regression Potential]
  This changes behavior for handling the MTU value for IPv6, which should be no 
higher than the device MTU. Since 0 is an invalid value for MTU anyway, this 
should not otherwise affect MTU handling for devices.
  Possible regressions from the change might include invalid (too high) set MTU 
for a device due to the failure to recognize cases where the MTU needs to be 
adjusted, leading to packet loss on IPv6.

  --

  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match 

[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[Mathieu Trudel-Lapierre]

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]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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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[Desktop-packages] [Bug 1499827] Re: [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

[nemith]

** Summary changed:

- [ipv6] Network manager spews logs of Lowering IPv6 MTU (1480) to match device 
MTU (1280)
+ [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

-- 
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/1499827

Title:
  [ipv6] Network manager incorrectly lowers MTU when IPv6 is enabled

Status in NetworkManager:
  Fix Released
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Network manager is sending out a lot of warnings about changing the MTU:
  Sep 25 14:13:03 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (1280)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Lowering IPv6 
MTU (1480) to match device MTU (0)
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): IPv6 MTU (0) 
smaller than 1280, adjusting
  Sep 25 14:13:21 desktop NetworkManager[703]:   (wlan0): Raising device 
MTU (0) to match IPv6 MTU (1280)
  Sep 25 14:13:29 desktop NetworkManager[703]:   (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'.

To manage notifications about this bug go to:
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