Application gateway

Application gateway

Application gateways, occasionally referred to as called application proxies, are applications located between the end user and the Internet. Application gateways are used in unified communications

Functioning mechanism

# The end user contacts directly the application gateway.
# The application gateway performs the requested function on behalf of the user.
# The application gateway acts also as a firewall by intercepting any IP packets from the Internet.
# The application gateway can enforce the security policy since the end user never talks directly to a system on the Internet.

Pros and Cons

* Security - The application gateway runs on a secured host. Since the proxy stands between the user and the target system, they are not transparent to the users. Users will need to install custom applications to contact application gateways. No user accounts are saved on this bastion host
* Simplicity - The only function of the host running the application gateway is to proxy requests from end users.

Application Gateway products

* Microsoft
* Cisco
* Nortel

Further reading

* Classical versus Transparent IP Proxies RFC 1919


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