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Date: Wed, 6 Feb 2008 20:49:35 -0600 (CST)
From: Mike Silbersack <silby@silby.com>
To: "Bruce M. Simpson" <bms@FreeBSD.org>
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Cc: cvs-src@FreeBSD.org, Mike Silbersack <silby@FreeBSD.org>,
	cvs-all@FreeBSD.org, src-committers@FreeBSD.org
Subject: Re: cvs commit: src/sys/netinet ip_id.c
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On Thu, 7 Feb 2008, Bruce M. Simpson wrote:

> Mike Silbersack wrote:
>>    Note that this commit does not yet enable random IP ID
>>   generation by default.  There are still some concerns
>>   that doing so will adversely affect performance.
>> 
>
> Random ip_id generation also breaks MANET multicast as it's currently 
> specified -- the ip_id field gets used for histogram based duplicate packet 
> detection. However, after my inveigling, Fred Templin at Boeing brought 
> encapsulation back into the proposal on the table.
>
> So some way to turn this stuff off on a per-interface basis is probably going 
> to be needed later on for mobile stuff...
>
> later
> BMS

Does MANET multicast require:

1) Sequentiality.
or
2) No repetition of an ID within a certain timeframe.

The distinction is quite important!

Mike "Silby" Silbersack