Setting ip address in Cisco 2511

[rythmstr]

I need to change the ip address for our modems in a router. I figured this wouldn't be too hard since I have some experience with the router - but I keep getting one of the two errors when attempting to make the change:


router(config)#interface Group-Async1
router(config-if)#ip address xx.xx.xx.x 255.255.255.192
xx.xx.xx.x overlaps with Ethernet0
router(config-if)#ip address xx.xx.xx.x 255.255.255.253
Bad mask 0xFFFFFFFD for address xx.xx.xx.x


The subnet mask for all of the machines on the network is 255.255.255.0.

Any ideas folks? Thanks in advance.
/R

 

[AdmanOK]

Without seeing the IP addresses that you are working with there is no way to tell if you addressing scheme is valid and it there trully is an overlap...

 

[chieftan999]

If it is correct and you are trying to supply a 255.255.255.253 subnet mask, then it will come back as invalid. The last legal subnet mask that can be used is 255.255.255.252 since you need at least 2 addresses for nodes. This is probably where the problem lies.

 

[rythmstr]

Thanks - I may have found another way around this....

Thanks for the input..
/R