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Re: IP-ID field of ICMP echo request

To: Kohei OHTA <kohei@xxxxxxxxxx>
Subject: Re: IP-ID field of ICMP echo request
From: Maciej Soltysiak <solt@xxxxxxxxxxxxxxxxx>
Date: Mon, 7 Jul 2003 14:29:28 +0200 (CEST)
Cc: netdev@xxxxxxxxxxx
In-reply-to: <3F095B7B.5090203@xxxxxxxxxx>
References: <3F095B7B.5090203@xxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
> I found a strange packet, which is generated by ping of Linux.
> It is observed ID field of IP header in ping packet (Echo request) is always 
> 0.
>
> I confirmed this on kernel 2.4.18 and 2.4.21.
> My colleague also confirmed this is fixed in kernel 2.5.74.
>
> I hope this is fixed in next next 2.4.x release.
RFC 792 says:
...
Identifier

   If code = 0, an identifier to aid in matching echos and replies,
   may be zero.
...

I guess it is okay to have 0 as IPID.

Regards,
Maciej


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