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Subject: Re: weird ip sequence number
To: xinwenfu@cs.tamu.edu (Xinwen - Fu)
Date: Mon, 18 Feb 2002 20:42:36 +0000 (GMT)
Cc: root@chaos.analogic.com (Richard B. Johnson), linux-kernel@vger.kernel.org
In-Reply-To: <Pine.SOL.4.10.10202181413160.8734-100000@dogbert> from "Xinwen - Fu" at Feb 18, 2002 02:24:50 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Although there are few chances that our randomly chosen ip_id collides
> with the other packet's ip_id generated by kernel, I don't want this
> possibility to happen.

So pick one at random. However its a pretty strange way to abuse IP.

> So is there any method to get a true ip_id from the kernel? 
> I want this ip_id to do my own fragmentation on a packet.

Linux does not generate ip idents on DF frames. You can't fragment a DF
frame anyway so the problem does not arrive. Frames without DF get assigned
ip ids
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