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Under Ubuntu 12.04 LTS, I would, whenever I wanted to connect a different computer to the Internet, unplug the Ethernet cable and plug it into the other computer. When I wanted to use Ubuntu again, I would plug the cable back into the Ubuntu machine. The network applet would easily negotiate a new connection, even after several days of being disconnected.

I upgraded to Ubuntu 13.10 because some kind of malware infected 12.04, don't know how. In any case, if I unplug it for more than 5 minutes or so, I can no longer switch the Ethernet cable between computers without losing the Ethernet connection on the 13.10 machine.

When the connection is working, the Networking applet (top toolbar) shows:

[dimmed] Ethernet Network 
         Ethernet Connection 1
         Disconnect
         VPN Connections
[checked] Enable Networking 
         Connection Information
         Edit Connections...

If I unplug the cable, after a few minutes several of the above entries disappear or get dimmed out:

[dimmed] Ethernet Network 
[dimmed] Disconnect
         Enable Networking 
[dimmed] Connection Information
         Edit Connections...

If I click Enable Networking it has no effect: Can't get a connection. If I click Edit Connections, then delete/add Ethernet Connection on eth0, it still doesn't work. I tried ifup and ifdown to no effect. The only way to get back online is to re-boot.

Surely there is a better way. Any help would be appreciated.

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Try this solution and this one . Second solution should work fine for you. –  floppy Mar 18 at 19:47
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