Date: Fri, 7 Mar 2008 09:18:51 +0500 From: "Sergey" <_lion_2000@mail.ru> To: <freebsd-net@freebsd.org> Subject: RE: Path MTU Problem Message-ID: <001101c8800a$596d4220$37c9010a@Net.ARDS.Corp> In-Reply-To: <20080306161818.GD15130@verio.net> References: <000001c87f43$c8075800$37c9010a@Net.ARDS.Corp> <20080306161818.GD15130@verio.net>
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> Is it possible that you have PF or IPFW filter rules in place > that drop ICMP? Just because tcpdump shows you the frame > arrived at your system, does not mean that it was "seen" by > the kernel. No, it's virgin clean install, without any packet filtering enabled > > here comes icmp frag packets. strange what sometimes > tcpdump complains > > about tcp header in icmp packet and sometimes not > > The reason for this complaint is that frag_needed packets > return a portion of the original IP frame back to the sender, > but the number of bytes is not sufficient to see the entire > TCP header. However, there is enough to see the src/dest > IP's and src/dest port numbers, as tcpdump shows you. But > tcpdump cannot decode past the end of the returned frame, so > it shows an error. I c
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