Method of processing data traffic at a firewall

Details Method of processing data traffic at a firewall Method of processing data traffic at a firewall

2005-08-17

2008-12-30

Revak, Christopher A (Department: 2131)

Information security

Access control or authentication

Network

C709S237000

Reexamination Certificate

active

07472414

ABSTRACT:
A method of processing data traffic at a firewall has been developed. The method prevents unauthorized access to a computer system by first receiving a SYN request for access to a destination in the system at a firewall. Upon receipt of a SYN request, the firewall sends a reply with an SYN/ACK message with changed packet information within the SYN/ACK message. The firewall receives an ACK message in reply to the SYN/ACK message. After the ACK message is authenticated by the firewall, the SYN request is recreated and forwarded to the destination in the system.

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“Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide”, 2004, Release 2.2, Chapter 1, p. 1-12.

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