Date: Wed, 14 Feb 2007 00:51:57 +0200 From: Alexander Motin <mav@alkar.net> To: Stephen.Clark@seclark.us Cc: freebsd-net@freebsd.org Subject: Re: pmtud problem Message-ID: <45D2410D.70509@alkar.net> In-Reply-To: <1171401795.00688172.1171391400@10.7.7.3> References: <1171398196.00688135.1171386001@10.7.7.3> <1171398210.00688151.1171387801@10.7.7.3> <1171401795.00688172.1171391400@10.7.7.3>
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Stephen Clark wrote: >>> if the pc sends a packet of 1460 bytes with the DF bit set shouldn't the >>> freebsd 4.9 system >>> send back an icmp dest unreachable - fragmentation needed and DF bit >>> set? >> >> Are you blocking icmp with a firewall filter? >> > Good question - but the answer is no. The other interesting fact is > when I drop the mtu on > the gre to 1412 I do see the icmp messages. Are you using any dummynet shapes? There is ancient bug in dummynet, which leads to not sending of ICMPs when shape used on outgoing interface. -- Alexander Motin mav@alkar.net Optima Telecom
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