Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network access regulating
Patent
1997-09-12
2000-11-28
Maung, Zarni
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network access regulating
709221, 713200, G06F 15177, G06F 15173, G06F 1214
Patent
active
061547751
ABSTRACT:
The invention provides improved computer network firewalls which include one or more features for increased processing efficiency. A firewall in accordance with the invention can support multiple security policies, multiple users or both, by applying any one of several distinct sets of access rules. The firewall can also be configured to utilize "stateful" packet filtering which involves caching rule processing results for one or more packets, and then utilizing the cached results to bypass rule processing for subsequent similar packets. To facilitate passage to a user, by a firewall, of a separate later transmission which is properly in response to an original transmission, a dependency mask can be set based on session data items such as source host address, destination host address, and type of service. The mask can be used to query a cache of active sessions being processed by the firewall, such that a rule can be selected based on the number of sessions that satisfy the query. Dynamic rules may be used in addition to pre-loaded access rules in order to simplify rule processing. To unburden the firewall of application proxies, the firewall can be enabled to redirect a network session to a separate server for processing.
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Coss Michael John
Majette David L.
Sharp Ronald L.
Cardone Jason D.
Lucent Technologies - Inc.
Maung Zarni
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