Circuit-Level Gateway
Encyclopedia
A circuit-level gateway is a type of 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. This is useful for hiding information about protected networks. Circuit level gateways are relatively inexpensive and have the advantage of hiding information about the private network they protect. On the other hand, they do not filter individual packets.
Circuit level gateways work at the session layer of the OSI model
OSI model
The Open Systems Interconnection model is a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a prescription of characterizing and standardizing the functions of a communications system in terms of abstraction layers. Similar...
, 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. This is useful for hiding information about protected networks. Circuit level gateways are relatively inexpensive and have the advantage of hiding information about the private network they protect. On the other hand, they do not filter individual packets.
External links
- http://netsecurity.about.com/cs/generalsecurity/g/def_circgw.htm
- 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