How do I express this network list?

[whiteford]

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.

[e-dennington]

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.