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FIREWALL TECHNOLOGIES (Packet Filtering (basic method for protecting the…
FIREWALL TECHNOLOGIES
Packet Filtering
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Filter data, based on: service type, port number, interface number, source address, and destination address, among other criteria.
example, a packet filter can permit or deny service advertisements on an interface.
Can use incoming and outgoing filters to dictate (order) what information passes into or out of our intranet.
Circuit-Level Gateways
Works at the session layer in the OSI model, which means that more information is required before packets are allowed or denied.
It monitor TCP handshaking between packets to determine whether a requested session is legitimate (genuine/legal).
Access is determined based on: address, DNS domain name, or DNS username.
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Circuit-level gateways can bridge different network protocols, for example, IPX to IP.
Our username is checked and granted (decided/approved) access before the connection to the router is established.
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PROXY
Proxy Server (application gateway or forwarder) is a application between traffic and two network segment.
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With a proxy as a connector, source and destination cannot directly connected.
IP address of Proxy server is hide from user to prevent from outside user know the architecture of network.
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