[LUGSB] Multiple IPs on one NIC + DNS problem

[Michael Hart]

Hello all,

I set up and used multiple IPs on several NICs on my lab successfully. 
The unintended consequence was that the machines were no longer accessible 
outside the lab (i.e. ping / ssh / etc. didn't work).  Why is this the 
case?  The DNS works after I shut down the interfaces.  Is the problem at 
the router or dns?  Any ideas or suggestions would be extremely helpful. 
We are using Bind9 in our laboratory.  The machines are assigned their IP 
address over DHCP based on their MAC address.  The command I used to add 
IP aliases is:

sudo ifconfig eth0:0 W.X.Y.Z up

thanks!
michael

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Michael Hart
PhD Computer Science Stonybrook Univ