Date: Sat, 5 Jan 2002 19:40:38 +0100 From: Jesper Skriver <jesper@FreeBSD.org> To: "Louis A. Mamakos" <louie@TransSys.COM> Cc: Guido van Rooij <guido@gvr.org>, Terry Lambert <tlambert2@mindspring.com>, William Carrel <william.carrel@infospace.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: path_mtu_discovery Message-ID: <20020105194037.G28939@FreeBSD.org> In-Reply-To: <200201042302.g04N2A789953@whizzo.transsys.com>; from louie@TransSys.COM on Fri, Jan 04, 2002 at 06:02:10PM -0500 References: <26E71536-013D-11D6-8ED3-003065D5E9A4@infospace.com> <3C36149B.B9C02DCF@mindspring.com> <20020104223235.GA64301@gvr.gvr.org> <200201042302.g04N2A789953@whizzo.transsys.com>
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On Fri, Jan 04, 2002 at 06:02:10PM -0500, Louis A. Mamakos wrote: > > One possibility is that the code in icmp_input() processing the > PMTU discovery-induced ICMP message could verify that the returned > header in fact is associated with a connection on the host and > maybe even has sane sequence numbers (for TCP segments). The code does that today src/sys/netinet/tcp_subr.c in tcp_ctlinput() added in rev 1.94 on february 26th 2001 when it was moved from src/sys/netinet/in_pcb.c in_pcbnotify() added in rev 1.70 on december 24th 2000 > This would make it more difficult to just spray these packets at host > and drop the MTU on routes. /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Work: Network manager @ AS3292 (Tele Danmark DataNetworks) Private: FreeBSD committer @ AS2109 (A much smaller network ;-) One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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