Wired ICS constantly reconnecting

[Mikal Meltvik]

I often find myself using my laptop to supply internet connection to my other computer which does not have a wireless interface.
When I use Ubuntu 11.10 for this it keeps disconnecting and reconnecting frantically and constantly.
The wired connection is set to "Shared to other computers". Have seen this issue on at least one other machine besides mine so far.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: network-manager 0.9.1.90-0ubuntu4
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory
Date: Tue Oct 25 09:46:27 2011
Gconf:

IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
IpRoute:
 default via 192.168.1.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.116 metric 2
Keyfiles: Error: [Errno 2] No such file or directory
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2011-10-22T12:09:24.370997

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael T (newgletter)]

I do have exactly the same problem on 2 different notebooks (32bit and 64bit)!
It seems like "Shared to other computers" doesn't work anymore (wifi and lan, so i think its a problem with ip handling and not a driver problem?)... my workaround was reinstalling Ubuntu 11.04, where everything works fine... ;-)

I might add, that the first time, after a reboot, the connection "shared with other computers" works for about 10 seconds, after that it disconnects and every consecutive trial to reconnect will by disconnected imediatly...

Also I think this is a huge bug, because it will probably affect many people and affects pretty basic funktions like sharing a mobile internet connection with other computers. Is there any other workaround then mine, yet?

Thanks for helping!

Best regards,
Michael

[Mikal Meltvik (mikke654)]

It is the only workaround I know of as well, using Backbox 2 (which is based on Ubuntu 11.04).
I would like to use Ubuntu 11.10 for this instead, since I only use Backbox at work (mostly).
For now however, I will use Backbox until the bug is fixed.

[Karl Maier (w-wall2001)]

Here is an example for wireless ad-hoc connections.

Steps to reproduce: In the network manager on the host computer, add a wireless connection, set an SSID, set mode to "ad-hoc" and "IP-v4 settings" to "shared".

Expected: Other users can connect to the wireless network of the host and use its internet connection continuously.

Actual: Clients may be able to connect and intermittently have internet access and the host keeps connecting and disconnecting every 2-3 seconds.

[Joe Alam (yothsoggoth)]

I just tried in the 12.04 beta and this appears to be fixed for me, so reverting back to 11.04 is not the only option!

[Mathieu Trudel-Lapierre (cyphermox)]

Using the steps above will actually lead to a broken ICS connection, probably; because ICS doesn't seem to work well with IPv6 (and either way, dnsmasq can't provide v6 addresses). As a further step, make sure you go to the IPv6 tab as well and set IPv6 method to "Ignore", I think this will resolve the issue in most cases on 11.10.

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]