![]() The web or real server sends the proxy server a correct response, which is forwarded to the client or end user via the circuit-level gateway. After receiving the request, the external server sees the IP address of the proxy server, but does not receive any internal user information. Firewalls use a variety of techniques to control traffic, such as dynamic packet filtering firewalls, application gateway, circuit-level gateway, and proxy. Then the proxy server forwards the request to the web server. ![]() the IP address, exchanged in order to receive proper feedback. In contrast to application gateways, circuit-level gateways monitor the TCP data packet handshake and the compliance with firewall rules and guidelines.Ī proxy server is a security barrier between internal and external computers, while a circuit-level gateway is a virtual connection between the proxy server and the internal client.įor example, when a user web page access request passes through the switching gateway, basic internal user information, such as: B. A circuit-level gateway is a firewall that ensures connection security between UDP (UDP = User Datagram Protocol) and TCP (TCP = TCP = Transmission Control Protocol) and between the transport and application layers of an Open Systems Interconnection (OSI) network model how the session shift works. Circuit proxy firewalls allow or prevent data streams they do not filter individual packets. ![]()
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