There are several books on the topics and I maintain a list of on-line
resources at http://www.itprc.com/security.htm

Irwin

-----Original Message-----
From: Ronnie Toolte [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 12, 2000 1:26 PM
To: [EMAIL PROTECTED]
Subject: access-list ?


Does anyone know of a good resource that explains extended access-list?
I'm having problems understanding how to take a range of networks and
reduce them in number by summarizing them. For example, if  I want to
filter out all networks from 24.1.0.0 to 24.20.0.0, how would I
determine what inverse mask to use?

access-list 101 deny ip 24.1.0.0 ?.?.?.? any

I know if I want to filter just 24.1.0.0, I would do
access-list 101 deny ip 24.1.0.0 0.0.255.255 any

thanks in advance....

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