Checksumming Issues

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To: netfilter@xxxxxxxxxxxxxxxxxxx
Subject: Checksumming Issues
From: Leonid Veytser <veytser@xxxxxxxxx>
Date: Fri, 21 Nov 2003 15:15:30 -0500 (EST)
In-reply-to: <Pine.SOL.4.20.0311111752590.29271-100000@csa.bu.edu>
Sender: netfilter-admin@xxxxxxxxxxxxxxxxxxx

A general question about checksumming. If I change the destination address
in the IP header, then of course I need to recalculate the IP header
checksum. But do I have to recalculate the checksum of the next protocol
header (ie TCP, UDP, etc)?

Thanks.

Follow-Ups:
- Re: Checksumming Issues
  - From: Antony Stone

References:
- NF_QUEUE target and ip_queue.c
  - From: Leonid Veytser

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