Date: Sat, 3 Sep 2011 19:32:37 +0200 From: ian ivy <sidetripping@gmail.com> To: freebsd-security@freebsd.org Subject: Which algorithm is used for IP fragmentation ID? Message-ID: <CAASvXNtmEuiOz_KD-isb6dhkRhjkWaarEvOQ_wa%2BptNe8=WsNA@mail.gmail.com>
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Hello everyone. It is my first post on this mailinglist. As we know in FreeBSD there is the pseudo random number generator (PRNG) for random IP fragmentation ID. It is available when "net.inet.ip.random_id" sysctl variable is set to 1 (default 0). I would like to know, which algorithm (X2, X3 or A0 or another one) is used in FreeBSD 8.1-RELEASE or better in 8 branch? Which algorithm is used in FreeBSD for packet filtering (IP packet normalization, or e.g. scrub on $ext_if ... random-id for the PF ruleset), pfsync interface protocol and (if the kernel flag "net.inet.ip.random_id" is set to 1) for "regular" IP traffic (with TCP/UDP), IP multicast routing... etc? Best regards!
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