> Old address: 10.0.0.10
> New Address: 10.0.1.10
>
> 1) set IP address for e0 to 10.10.1.10
>
> 2) set IP address for e0.1 to 10.0.0.10
>
> 3) set reported ip to 10.0.0.10
This should work. I've seen ISPs that do this successfully. In all
honesty, if you're running OSPF, you don't even need a subinterface. Just
renumber everything in your OSPF area at the same time, make the
appropriate changes, and let OSPF route your traffic to the appropriate
spot.
> Okay at this point the network the PM3 is on will be the new address --
> 10.0.1.0, but the PM3 will be reporting the old address. Will this make
> Pipelines, Netopias, and Netgears happy? Is step 3 necassary, or does the
> fact that the IP aliased to e0.1 by itself solve the problem? If 3 is
> needed, I'm still stuck with switching everyone over to the address all
> at one time, when I ditch the reported ip, right?
You must report the correct IP to the remote side. The PM will take the
"primary" address of ether0 and report it unless you specify something
else via RADIUS.
As I said, if OSPF is routing your traffic, you really don't need to have
the old IP in the config of the PM at all.
Chad Scott
Beta Engineer
Lucent Technologies
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