How do I express this network list?

Unanswered Question
Aug 21st, 2007
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On our Cisco Concentrator we have to add network lists for the VPN tunnels like this:


192.168.9.0/0.0.0.255

170.20.90.0/0.0.0.255


I need to add 170.20.88.0/255.255.254.0


How will I express this?


The description is this:


Enter the Networks and Wildcard masks using the following format: n.n.n.n/n.n.n.n (e.g. 10.10.0.0/0.0.255.255).

Note: Enter a wildcard mask, which is the reverse of a subnet mask. A wildcard mask has 1s in bit positions to ignore, 0s in bit positions to match. For example, 10.10.1.0/0.0.0.255 = all 10.10.1.nnn addresses.


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e-dennington Tue, 08/21/2007 - 07:50
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You just use the reverse mask on the concentrator. To do this just subtract each octet of your current mask from 255. so 255.255.254.0's reverse is 0.0.1.255.

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