Date: Wed, 6 Feb 2008 20:49:35 -0600 (CST) From: Mike Silbersack <silby@silby.com> To: "Bruce M. Simpson" <bms@FreeBSD.org> 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 Message-ID: <20080206204812.J41033@odysseus.silby.com> In-Reply-To: <47AA5925.3000008@FreeBSD.org> References: <200802061540.m16FeXGD030782@repoman.freebsd.org> <47AA5925.3000008@FreeBSD.org>
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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
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