Re: Last Call: <draft-ietf-intarea-ipv4-id-update-05.txt> (Updated Specification of the IPv4 ID Field) to Proposed Standard

Joe Touch <touch@isi.edu> Mon, 18 June 2012 18:51 UTC

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Date: Mon, 18 Jun 2012 11:49:35 -0700
From: Joe Touch <touch@isi.edu>
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To: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
Subject: Re: Last Call: <draft-ietf-intarea-ipv4-id-update-05.txt> (Updated Specification of the IPv4 ID Field) to Proposed Standard
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I will include a response to the rest of this in my summary of the last
call concerns. Regarding your last point:

On 6/18/2012 5:39 AM, Masataka Ohta wrote:
...
> PS
> 
> While your draft is rather harmful than useless, I'm fine
> if the following point of the draft:
> 
>     >>  Originating sources MAY set the IPv4 ID field of atomic
>     datagrams to any value.
> 
> is changed to:
> 
>     >>  Originating sources MUST set the IPv4 ID field of atomic
>     datagrams to values as unique as possible.
> 
> which is what the current BSD implementations do.

There are implementations that set DF=1 and ID=0 (cellphones).

BSD does not make IDs as unique as possible; it selects them according
to a pseudorandom algorithm that does not take into account the
datagram's source IP, destination IP, or protocol. I.e., BSD code
repeats the IDs more frequently than necessary when a host concurrently
sources datagrams with different (srcIP, dstIP, proto) tuples.

So it would already be in violation of your proposed wording, as would
most ID generation mechanisms.

Joe