Network manager not working with manual settings

NoOp glgxg at
Fri Oct 24 19:32:12 UTC 2008

On 10/24/2008 11:28 AM, Lorenzo Taylor wrote:
> This problem has survived several updates, so is either an unknown bug or I'm 
> doing something wrong, although I can't figure out what.
> I have a second Ethernet port on my system that I am trying to set manually via 
> the network manager so that I can connect a second computer via a crossover 
> cable. I want to give it the IP address and netmask 
> However, once I click OK it adds the gateway and changes the netmask to 
> 21, which of course is invalid and causes the port to remain nonfunctional. 
> Ifconfig shows no address information at all for this port other than the mac 
> address. Also, the command
> sudo ifconfig eth1 netmask
> works correctly and causes the port to become functional. Should I be entering 
> something differently in network manager or is this a known bug that hasn't been 
> fixed yet? Could it be an as yet unreported bug?
> Thanks for any help,
> Lorenzo

I think that previous versions would allow you to put the device MAC
into /etc/iftab, but Hardy now uses
You might google on that (Ubuntu +70-persistent-net.rules +dual
ethernet) and see what you come up with.

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