How to extend my network by adding secondary IP to an Interface.

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Jun 27th, 2008
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Hi, Can anybody help me out with my problem explained below??

I have 2 separate networks being separated by a router ( and have used all available IP's on one network ( that is i want to add a secondary IP(that is to the same interface to expand the network.Now when i do that i cannot ping a device with an IP on the network but i can only ping the gateway which is I also i have access list on the router, therefore a machine on can only get into network by granting that IP access using cisco's access lists control.

Kindly help me as after adding the secondary IP which is to the same interface which has IP address there is no communication between and networks.

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Kevin Dorrell Fri, 06/27/2008 - 04:29
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Normally this should work. Could you post the configurations please? I suspect the problem is something to do with that access list, but I don't know for sure until I have seen the configs.

Try removing the access-group command temporarily to see if you get connectivity.

Kevin Dorrell


augustineampiah Fri, 06/27/2008 - 08:25
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Thanks Kevin, i will try removing the access lists as you suggested to see whether it will work since the link does down the first time i tried it,since it's a live network i can only do this very late in the night in other to reduce the down time for increased productivity. Thanks so much.


Augustine Ampiah,Aspiring CCNP and CCIE.


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