GNOME Bugzilla – Bug 485683
Static network settings while in livecd do not take effect without complete restart of network setting tool and re-assertion of the device checkbox
Last modified: 2008-01-24 19:24:21 UTC
The bug has been opened on https://bugs.launchpad.net/ubuntu/+source/gnome-system-tools/+bug/148606 "While testing the 7.10 beta desktop CD on a variety of i386 and amd64 systems, we detected a problem in the behavior of the manual network configuration tool. If in a liveCD session, one selects System->Administration->Network or NetworkManagerIcon->ManualConfiguration (they appear equivalent) and sets up a network interface as having a static IP, the interface does not activate until one closes the network tool, restarts it, unchecks the network device's checkbox and then re-checks it again. From that point on the network interface behaves normally. ... I can reproduce this problem with 7.10 installed on my notebook. eth0 (in my case) just doesn't come up. a simple $ sudo ifup eth0 is enough to make it work with a static ip." That seems to happen only when network-manager is running, network-admin manages to configure the interface after the steps described so network-manager is probably not stopping it
gnome-system-tools just modifies the interface configuration file(s) and runs ifup immediately on it in this case. I faced myself this problem a few times some time ago when testing gnome-system-tools/NetworkManager cooperation code, I found out I could reproduce it through command line too, and that everything worked as expected if NM wasn't active. My conclusion was that NM is not releasing properly the interface, so I'm moving this bug there.
*** This bug has been marked as a duplicate of 359600 ***