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Computer Evidence: Collection and Preservation, Second Edition by Christopher L. T. Brown

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Packet Filtering on Cisco Routers

Cisco routers implement packet filters as access control lists (ACLs), not to be confused with Windows NT ACLs. Basically, you create sets of ACLs and then apply them to the desired router interface as access groups.

A sample configuration follows. The first set of ACLs describes the connections allowed into the network from the outside if applied as an inbound rule to the proper interface.

List 101

 access-list 101 deny ip 192.168.100.0 0.0.0.255 any # Anti Spoofing—This statement won't allow connections from IP addresses within the internal network number. access-list 101 permit tcp any any established #Allow any TCP connections to ports that were established from the inside. access-list 101 permit tcp 192.168.200.0 ...

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