I have the same problem with knot 3 of edgy i386: it does not save the gateway address when using the Networking pane.
Workaround that seems to work for me: Close the Networking pane and don't open it anymore. Then add the following line to the corresponding interface in the file /etc/network/interfaces
[code]
gateway xxx.xxx.xxx.xxx
[/code]
Of course, xxx.xxx.xxx.xxx has to be the address of the gateway.
I have the same problem with knot 3 of edgy i386: it does not save the gateway address when using the Networking pane.
Workaround that seems to work for me: Close the Networking pane and don't open it anymore. Then add the following line to the corresponding interface in the file /etc/network/ interfaces
[code]
gateway xxx.xxx.xxx.xxx
[/code]
Of course, xxx.xxx.xxx.xxx has to be the address of the gateway.