Ethereal-users: [Ethereal-users] packet intercept tool?

Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.

From: Rakesh Arora <rake_arora@xxxxxxxxx>
Date: Wed, 7 Jul 2004 18:23:18 -0700 (PDT)
Hi,
 
Ethereal, as I understand, is a great packet capture tool. However, what I am looking for is a tool that will intercept the packets so that I can change some information in the IP header and then forward it on.
 
I don't think Ethereal provides such functionality (correct me if I am wrong). Can someone please suggest some tools that may be able to intercept packets.
 
Thanks in advance.