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
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