subnetting a class c on a cisco 3825

Posted by Adeodatus on Server Fault See other posts from Server Fault or by Adeodatus
Published on 2010-12-27T05:26:17Z Indexed on 2010/12/27 5:55 UTC
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Filed under:

networking

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cisco

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subnet

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cidr

I have a class C that I want to better understand before I implement a change.

Right now,

ip address 192.168.0.1 255.255.255.192
ip address 192.168.0.65 255.255.255.240 secondary

So, where is the 192.168.0.64 address in that mix? 192.168.0.63 should be the broadcast for the first one, and 192.168.0.65 should be the cisco secondary ip.

And ...

How then do I add a /28 (255.255.255.240) right before this segment:

ip address 192.168.0.249 255.255.255.248 secondary

In fact, I'll probably want to add it as a subinterface

Can anyone help me to better understand whats going on and then how to do it?

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