Circuit-level gateway: Difference between revisions

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{{Short description|Type of firewall in computing}}

A '''circuit-level gateway''' is a type of [[Firewall (networking)|firewall]].

Circuit -level gateways work at the [[session layer]] of the [[OSI model]], or as a "shim-layer" between the [[application layer]] and the [[transport layer]] of the [[TCP/IP]] stack. They monitor TCP handshaking between packets to determine whether a requested session is legitimate. Information passed to a remote computer through a circuit -level gateway appears to have originated from the gateway. ThisFirewall traffic is usefulcleaned forbased hidingon informationparticular aboutsession protectedrules networksand may be controlled to acknowledged computers only. Circuit-level firewalls conceal the details of the protected network from the external traffic, which is helpful for interdicting access to impostors. Circuit-level gateways are relatively inexpensive and have the advantage of hiding information about the private network they protect. On the other handHowever, they do not filter individual packets.

==See also==

* [[Application firewall]]

* [[Application-level gateway]] firewall

* [[Bastion host]]

* [[Dual-homed]]

==External links==

* http://netsecurity.about.com/cs/generalsecurity/g/def_circgw.htm {{Webarchive|url=https://web.archive.org/web/20050917201345/http://netsecurity.about.com/cs/generalsecurity/g/def_circgw.htm |date=2005-09-17 }}

* http://www.codepedia.com/1/Circuit-level+gateway

* http://www.softheap.com/internet/circuit-level-gateway.html

* http://www.pcstats.com/articleview.cfm?articleid=1450&page=5

* http://csrc.nist.gov/publications/nistpubs/800-10/node53.html

[[Category:Internet architecture]]

[[Category:Network socket]]

[[Category:Transmission Control Protocol]]