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Copyright © 2001 Cisco Systems, Inc. Page 2 of 11
Table of contents
Table of contents.............................................................................................................................2
Introduction......................................................................................................................................3
Issues with Firewalls and H.323......................................................................................................4
What is the Cisco Secure PIX Firewall?..........................................................................................4
What is NAT? ..................................................................................................................................5
Implementing NAT for uses with in-bound H.323 traffic...........................................................5
How to configure the Cisco Secure PIX Firewall to allow H.323 traffic ...........................................6
Breaking down the PIX configuration .......................................................................................8
Fixup protocol Command .........................................................................................................8
Static command .......................................................................................................................8
Access-list command ...............................................................................................................9
Access-group command ........................................................................................................10
Typical Ports used for H.323 traffic ........................................................................................11
Helpful Links...........................................................................................................................11