Reverse NAT/Intercepting Proxy Detection

This script is Copyright (C) 2008-2011 Tenable Network Security, Inc.

Synopsis :

The remote IP address seems to connect to different hosts
via reverse NAT, or an intercepting proxy is in the way.

Description :

Reverse NAT is a technology which lets multiple computers offer
public services on different ports via the same IP address.

Based on OS fingerprinting results, it seems that different
operating systems are listening on different remote ports.

Note that this behavior may also indicate the presence of a
intercepting proxy, a load balancer or a traffic shaper.

See also :

Solution :

Make sure that this setup is authorized by your security policy

Risk factor :


Family: Firewalls

Nessus Plugin ID: 31422 ()

Bugtraq ID:


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