As the name indicates, A proxy is a to act like someone else.
To start with, following are the different types of proxies
Forward web proxy ( Also called, egress )
To better understand with an example : A forward proxy is used to provide internet access to number of users. The forward proxy can access the internet. This way only the proxy server is exposed to internet thus, securing the users by not connecting to the inter net directly.
Some products in this Arena :
- Microsoft Proxy Server 2.0
- Microsoft ISA Server
- Squid
- Netscape proxy Server
- Apache
egress : Requests(HTTP/FTP/HTTPS) that originates from inside the network and goes OUT to the internet.EX : You Sending an email to someone@gmail.com or someone@yahoo.com from your outlook.
- Reverse web proxy ( Called Ingress )
Products :
Microsoft ISA Server.
Apache
Sun iPlanet
CISCO CSS/CSM ( Hardware[ Hardware solution ]
ServerIron ( Foundry Networks [ Hardware solution ]
Requests(HTTP/FTP/HTTPS) that originates from outside of the network and comes into the intranet.
Example, e-mail messageis considered ingress traffic. eMail will originate somewhere outside of a enterprise’s LAN, pass over the Internet and enter the company’s LAN before it is delivered to the recipient.
Reverse Proxy
- Secure web proxy
This is a SSL Tunnel proxy. All the traffic gets transported using this TUNNEL.
The clients sends a CONNECT request.
Most of the products support the CONNECT Method.
Works at Layer 3 :
- SOCKS proxy
It is a TCP wrapping protocol that relays TCP traffic from client to server.
Socks : Operates at Layer 5 ( Session protocol )
- Reverse web proxy
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- Transparent proxy
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- Netwrok address translation
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