Date: Wed, 7 Jan 2004 17:56:12 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Andre Oppermann <andre@FreeBSD.ORG> Cc: freebsd-net@FreeBSD.ORG Subject: Re: kern/60889 - zero IP id change issues in 5.2RC2 Message-ID: <200401072256.i07MuCnH066940@khavrinen.lcs.mit.edu> In-Reply-To: <3FFC8CBE.13B527A3@freebsd.org> References: <200401072023.UAA18922@starburst.demon.co.uk> <3FFC8CBE.13B527A3@freebsd.org>
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<<On Wed, 07 Jan 2004 23:48:30 +0100, Andre Oppermann <andre@FreeBSD.ORG> said: > 1. Do you think it is neccessary to do a htons() on the randomized > ip_id too? I'd say yes if there is a case where it has to > monotonically increase afterwards. Does it? IP IDs are nonces. The only requirement is that they not be reused for a packet to the same destination IP address before reassembly has timed out. In practice, this is impossible to guarantee, so the usual practice is to try to ensure a complete cycle (of 16-bit numbers). The order doesn't matter. I prefer not byte-swapping the address, but with a modern processor that overhead can probably be pipelined out anyway. -GAWollman
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