Date: Tue, 18 Jan 2011 09:58:57 -0800 From: Chuck Swiger <cswiger@mac.com> To: Axel Rau <Axel.Rau@Chaos1.DE> Cc: freebsd-net@freebsd.org Subject: Re: RESOLVED: Re: 8.1 Box does not react on ICMP "unreachable - need to frag" Message-ID: <0358F6C5-BCCD-4289-8522-B2945EDEC315@mac.com> In-Reply-To: <60CA2B35-71FF-4A7A-9C46-22B3F8C106D2@Chaos1.DE> References: <F9645DE3-E8DD-4631-B248-06CB53F016EE@Chaos1.DE> <71EEB2EA-3F48-4850-AB9C-92E47ED72D99@Chaos1.DE> <4D359841.50306@aws-net.org.ua> <60CA2B35-71FF-4A7A-9C46-22B3F8C106D2@Chaos1.DE>
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On Jan 18, 2011, at 6:14 AM, Axel Rau wrote: > Am 18.01.2011 um 14:40 schrieb Artyom Viklenko: >> Make sure DB2 got ICMP need-frag message and it not blocked. >> Also, check sysctl variable 'net.inet.tcp.path_mtu_discovery'. > > Yes to both. So this is a bug in 8.1? If DF is true and the packet exceeds the MTU, then it is dropped per RFC-791. This can be used by pMTU discovery, if enabled. Regards, -- -Chuck
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