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How do I express this network list?

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.

1 REPLY
New Member

Re: How do I express this network list?

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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