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[Bug 1542883] [NEW] With IPv6 connection and RA the MTU value sometimes get reset to link default

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Public bug reported:

In the router the radvd.conf:

--- cut ---
interface eth0
{
        AdvSendAdvert on;
        

        # Disable Mobile IPv6 support
        AdvHomeAgentFlag off;
        AdvLinkMTU 1410;

        prefix 2001:470:212c::/64
        {
                AdvOnLink on;
                AdvAutonomous on;

                # Disable Mobile IPv6 support
                AdvRouterAddr off;
        };
};   
--- cut ---

So the advertised MTU is 1410. The interfaces configured to dual stack.
So there is an IPv4 link with MTU 1500.

If I read this in syslog:

--- cut ---
Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <warn>  (enp1s0): DHCPv6 request timed out.
Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <info>  (enp1s0): DHCPv6 state changed unknown -> timeout
Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <info>  (enp1s0): canceled DHCP transaction, DHCP client pid 26074
Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <info>  (enp1s0): DHCPv6 state changed timeout -> done
--- cut ---

The /proc/sys/net/ipv6/conf/enp1s0/mtu is: 1500 which is wrong.


After I read this in syslog:

--- cut ---
Feb  7 14:34:20 szimszon-kili dhclient: DHCPREQUEST of 192.168.55.70 on enp1s0 to 192.168.55.1 port 67 (xid=0x28751fdf)
Feb  7 14:34:20 szimszon-kili dhclient: DHCPACK of 192.168.55.70 from 192.168.55.1
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    address 192.168.55.70
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    plen 24 (255.255.255.0)
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    gateway 192.168.55.1
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    server identifier 192.168.55.1
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    lease time 600
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    nameserver '192.168.55.1'
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    domain name 'kopaszhegy'
Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>  (enp1s0): DHCPv4 state changed bound -> bound
Feb  7 14:34:20 szimszon-kili dbus[906]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Feb  7 14:34:20 szimszon-kili dhclient: bound to 192.168.55.70 -- renewal in 293 seconds.
Feb  7 14:34:20 szimszon-kili systemd[1]: Starting Network Manager Script Dispatcher Service...
Feb  7 14:34:20 szimszon-kili dbus[906]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Feb  7 14:34:20 szimszon-kili systemd[1]: Started Network Manager Script Dispatcher Service.
Feb  7 14:34:20 szimszon-kili nm-dispatcher: Dispatching action 'dhcp4-change' for enp1s0
--- cut ---
 The /proc/sys/net/ipv6/conf/enp1s0/mtu is: 1410 which is good.

Because the IPv6 connection can't handle packet size bigger than 1420 if
the interface has MTU 1500 than there are many connection problems.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: network-manager 1.0.4-0ubuntu5.2
ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
Uname: Linux 4.2.0-27-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Feb  7 17:25:09 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-11-10 (89 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
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/1542883

Title:
  With IPv6 connection and RA the MTU value sometimes get reset to link
  default

Status in network-manager package in Ubuntu:
  New

Bug description:
  In the router the radvd.conf:

  --- cut ---
  interface eth0
  {
          AdvSendAdvert on;
          

          # Disable Mobile IPv6 support
          AdvHomeAgentFlag off;
          AdvLinkMTU 1410;

          prefix 2001:470:212c::/64
          {
                  AdvOnLink on;
                  AdvAutonomous on;

                  # Disable Mobile IPv6 support
                  AdvRouterAddr off;
          };
  };   
  --- cut ---

  So the advertised MTU is 1410. The interfaces configured to dual
  stack. So there is an IPv4 link with MTU 1500.

  If I read this in syslog:

  --- cut ---
  Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <warn>  (enp1s0): DHCPv6 request timed out.
  Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <info>  (enp1s0): DHCPv6 state changed unknown -> timeout
  Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <info>  (enp1s0): canceled DHCP transaction, DHCP client pid 26074
  Feb  7 14:32:37 szimszon-kili NetworkManager[903]: <info>  (enp1s0): DHCPv6 state changed timeout -> done
  --- cut ---

  The /proc/sys/net/ipv6/conf/enp1s0/mtu is: 1500 which is wrong.

  
  After I read this in syslog:

  --- cut ---
  Feb  7 14:34:20 szimszon-kili dhclient: DHCPREQUEST of 192.168.55.70 on enp1s0 to 192.168.55.1 port 67 (xid=0x28751fdf)
  Feb  7 14:34:20 szimszon-kili dhclient: DHCPACK of 192.168.55.70 from 192.168.55.1
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    address 192.168.55.70
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    plen 24 (255.255.255.0)
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    gateway 192.168.55.1
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    server identifier 192.168.55.1
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    lease time 600
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    nameserver '192.168.55.1'
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>    domain name 'kopaszhegy'
  Feb  7 14:34:20 szimszon-kili NetworkManager[903]: <info>  (enp1s0): DHCPv4 state changed bound -> bound
  Feb  7 14:34:20 szimszon-kili dbus[906]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
  Feb  7 14:34:20 szimszon-kili dhclient: bound to 192.168.55.70 -- renewal in 293 seconds.
  Feb  7 14:34:20 szimszon-kili systemd[1]: Starting Network Manager Script Dispatcher Service...
  Feb  7 14:34:20 szimszon-kili dbus[906]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
  Feb  7 14:34:20 szimszon-kili systemd[1]: Started Network Manager Script Dispatcher Service.
  Feb  7 14:34:20 szimszon-kili nm-dispatcher: Dispatching action 'dhcp4-change' for enp1s0
  --- cut ---
   The /proc/sys/net/ipv6/conf/enp1s0/mtu is: 1410 which is good.

  Because the IPv6 connection can't handle packet size bigger than 1420
  if the interface has MTU 1500 than there are many connection problems.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: network-manager 1.0.4-0ubuntu5.2
  ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Feb  7 17:25:09 2016
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2015-11-10 (89 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  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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