ICS - Internet Connection Sharing

[Kristopher]

OS:
Ubuntu 11.10 beta 1

Brief Description:
11.04 worked well. With the 11.10 beta 1 release I encountered issues with ICS via lan eth0 when attempting to share my wifi connection to a desktop. Both use Ubuntu and the issue is only present in 11.10 beta 1. Everything seems to be configured correctly but I encounter the computer in which I share the connection, to be repeatedly connecting and dropping the connection in 5 sec intervals when attempting ICS with Lan from my wireless computer until I receive a bug notice when I attempt to try other settings. Everything else seems to work with Network connections except ICS. Sorry for the lack of info or logs. This was tested in the 64 bit version using Ubuntu 11.10 beta 1 - as said before the computers used were plug and play with 11.04.
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ApportVersion: 1.22.1-0ubuntu2
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory
DistroRelease: Ubuntu 11.10
Gconf:

IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
IpRoute:
 default via 192.168.1.254 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 192.168.1.64
Keyfiles: Error: [Errno 2] No such file or directory
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
Package: network-manager 0.9.0-0ubuntu3
PackageArchitecture: amd64
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.0.0-11.17-generic 3.0.4
Tags: oneiric running-unity
Uname: Linux 3.0.0-11-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2011-09-12T17:15:11.395570

[C de-Avillez (hggdh2)]

Resetting package to Network-Manager, this seems, so far, the best bet.

[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Kristopher (kristopher-j-sullivan)]

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[Mathieu Trudel-Lapierre (cyphermox)]

Are you using the same process on both systems?

Note the errors here:
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Executing: /sbin/iptables --table filter --insert FORWARD --destination 10.42.43.0/255.255.255.0 --out-interface eth0 --match state --state ESTABLISHED,RELATED --jump ACCEPT
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Executing: /sbin/iptables --table nat --insert POSTROUTING --source 10.42.43.0/255.255.255.0 --destination ! 10.42.43.0/255.255.255.0 --jump MASQUERADE
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Starting dnsmasq...
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> (eth0): device state change: ip-config -> activated (reason 'none') [70 100 0]
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Activation (eth0) successful, device activated.
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Activation (eth0) Stage 5 of 5 (IP Configure Commit) complete.
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Get) complete.
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <warn> dnsmasq exited with error: Network access problem (address in use; permissions; etc) (2)
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> (eth0): device state change: activated -> failed (reason 'sharing-start-failed') [100 120 18

The last two indicate dnsmasq has failed to start because the IP was already in use. This is likely because on the same link, another system is already configured to share the connection or there is an issue with the network's router configuration.

Please verify your settings or provide additional information as to how your network is configured, how many systems are connected to the wired network (including things behind a switch or router), and how the other systems are configured.

Note that ICS uses the 10.42.43.0 range to setup connection sharing. This is hard-coded.

[b3nn0 (agib)]

I'm also affected by this bug (and get the same log errors) on a fully updated (just installed from daily-live) Oneiric system.
I have only one Netbook which accesses Wifi and one Desktop connected via LAN. I want to share the Wifi-Internet connection to the desktop.
The desktop (kubuntu) is set to DHCP. But even with networking disabled at the desktop (by using the network-manager applet in kubuntu), the ICS connection is lost immediately after being established. So I guess there is not really a duplicate IP in the network.
The network behind the Wifi-device uses a completely different ip-range (192.168.1.*), so there is no way that the IP adress is already in use.

[Albert Pool (albertpool)]

The repeated dropping, connecting, dropping, connecting also happens at me, on Linux Mint 11 or 12 so Ubuntu 11.04 or 11.10. It even happens when the host computer is Linux and the client is Windows.

[Graeme Gregory (dp-xora)]

Have hit this bug as well.

Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <warn> dnsmasq exited with error: Network access problem (address in use; permissions; etc) (2)

Is because Network Manager does not kill dnsmasq when it drops the connection. There is no indication in the logs though why NM decides to keep dropping the connection for no reason.

[Launchpad Janitor (janitor)]

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