If you can still reproduce this behaviour with your router, please try waiting a few minutes to see if nettool comes back.
** Changed in: gnome-nettool (Ubuntu) Status: Unconfirmed => Needs Info -- gnome-nettool hangs when hostname resolution fails https://launchpad.net/bugs/24241 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs