Date: Fri, 3 May 2002 14:33:35 +0200 From: Ruben van Staveren <ruben@verweg.com> To: Korey Pelton <peltkore@hotmail.com> Cc: freebsd-stable@freebsd.org Subject: path MTU Re: I cannot access some websites Message-ID: <20020503123334.GA17463@erg.verweg.com> In-Reply-To: <LAW2-F14333HFnwpGR80000a34b@hotmail.com> References: <LAW2-F14333HFnwpGR80000a34b@hotmail.com>
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On Thu, May 02, 2002 at 06:23:23PM -0600, Korey Pelton wrote: > Hello, > > I apologize for cross-posting this, but I haven't recieved a reply from > -questions yet, and I need to get this fixed for my job or I will have to > switch to Windows. Not an exucse, because you are likely to have the same problem. It sounds like a MTU issue, consult your network administrator and ask them about path MTU and analyze your traffic with tcpdump/ethereal. You are sending ip traffic with a smaller MTU than the receiving host. These hosts respond to your traffic but sets the 'DF' bit (Don't Fragment) when sending a reply. That reply is discarded when it arrives at the network host (router or endpoint) which has a smaller MTU. Normally this would generate an IP fragment but is wasted due to the DF bit. The network host responds to you with an ICMP NeedFragment to notify you it went wrong. Kind regards, Ruben -- ,-_ .----------------------------------------------------------------. /() ) | Ruben van Staveren http://ruben.is.verweg.com/ |_o (__ ( |Men are from Mars. Women are from Venus. Computers are from hell| #> =/ () `----------------------------------------------------------------' 4 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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