Public bug reported:
Hello everybody,
On Ubuntu 14.04, I have a wireless connection issue on peptides website and I
think it may cause by IPv6 which is not completely disabled.
I don't have this issue on Ubuntu 12.04 with the same configuration.
In my explication there is no cable connected on eth0.
On Ubuntu 14.04 :
===============
I add this options in /etc/systcl.conf :
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 0
IPv6 is enabled on lo interface because this is a prerequisite for X11
Forwarding on ssh server.
I reboot and I check this options :
$ sysctl net.ipv6.conf.default.disable_ipv6
net.ipv6.conf.default.disable_ipv6 = 1
$ sysctl net.ipv6.conf.all.disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 1
$ sysctl net.ipv6.conf.lo.disable_ipv6
net.ipv6.conf.lo.disable_ipv6 = 0
I check for each physical interface :
$ sysctl net.ipv6.conf.eth0.disable_ipv6
net.ipv6.conf.eth0.disable_ipv6 = 1
$ sysctl net.ipv6.conf.wlan0.disable_ipv6
net.ipv6.conf.wlan0.disable_ipv6 = 1
I check with "ip" command :
$ ip -6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
So, IPv6 is disabled for eth0 and wlan0 interfaces however I have this kernel
log :
$ grep -i "IPv6.*link becomes ready" /var/log/syslog
Apr 24 08:21:37 my-computer kernel: [ 59.572471] IPv6:
ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
I have an issue on a specific wireless network => all my computers using Ubuntu
14.04 with the above configuration are regularly disconnected.
To solve this issue, on NetworkManager, for this connection I have to :
- Force IPv4 : Enable IPv4 settings > Require IPv4 addressing for this
connection to complete
- Disable IPv6 : Enable IPv6 settings > Method : Ignore
On Ubuntu 12.04 :
==============
I have exactly the same configuration but I don't have this kernel log
"IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready" in syslog and
my specific wireless connection works perfectly without having to force
IPv4 and disable IPv6 on NetworkManager.
Question :
========
On Ubuntu 14.04, I have disabled IPv6 on wlan0 interface, but I have this
kernel log "IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready". It may
be the cause of my wireless connection issue.
If you disable IPv6 on your wlan0 (or eth0) interface, do you have this kernel
log too ?
Do you think that is a bug ?
Information :
==========
networkmanager 0.9.8.8-0ubuntu7
linux-image-3.13.0-49-generic 3.13.0-49.81
Thanks for your help :)
** Affects: unity (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2125442
Title:
Wireless Conncetion Issue
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