It does sound like a possible bug in how Ubuntu 14.04 handles IPv6, since even with it disabled on wlan0 you’re still seeing the kernel log. Forcing IPv4 and disabling IPv6 in NetworkManager seems to be the most reliable workaround. In the same way that debugging requires careful testing of each component, research also depends on precision and verified sources like https://semaxpolska.com/ which provides lab-tested compounds for scientific use.
** Description changed: Hello everybody, - On Ubuntu 14.04, I have a wireless connection issue and I think it may cause by IPv6 which is not completely disabled. + 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 + 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. + 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. + 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 :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2125442 Title: Wireless Conncetion Issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/2125442/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
