From owner-freebsd-stable Sat Feb 2 4:14:31 2002 Delivered-To: freebsd-stable@freebsd.org Received: from smtp1.alkar.net (pandora.alkar.net [195.248.191.68]) by hub.freebsd.org (Postfix) with ESMTP id 1A5C837B404; Sat, 2 Feb 2002 04:14:26 -0800 (PST) Received: by smtp1.alkar.net (Postfix, from userid 1000) id 86000F88D; Sat, 2 Feb 2002 14:14:20 +0200 (EET) Date: Sat, 2 Feb 2002 14:14:20 +0200 From: Alexey Luckyanchikov To: cjclark@alum.mit.edu Cc: freebsd-stable@FreeBSD.ORG, freebsd-net@FreeBSD.ORG Subject: Re: Weird path MTU autodiscovery problem in 4.5-RELEASE Message-ID: <20020202121420.GA30077@alkar.net> References: <20020201125326.GA3036@alkar.net> <20020201094702.P152@gohan.cjclark.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020201094702.P152@gohan.cjclark.org> Organization: ISP Alkar Teleport Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 01 Feb 2002, Crist J. Clark wrote: CJC> On Fri, Feb 01, 2002 at 02:53:26PM +0200, Alexey Luckyanchikov wrote: CJC> > Hello, CJC> > CJC> > I have such network topology: CJC> > CJC> > +--------+ +--------+ +--------+ CJC> > | Server |<---- MTU 1500 ---->| Router |<---- MTU 1476 ---->| Client | CJC> > +--------+ +--------+ +--------+ CJC> CJC> [snip] CJC> CJC> > 14:06:48.682558 router > server: icmp: client unreachable - need to frag (mtu 1476) for server.7 > client.1371: [|tcp] (DF) (ttl 61, id 25428, len 1500) (ttl 253, id 2491, len 56) CJC> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ CJC> > Router say to server that he must to decrease packet size CJC> CJC> Is "router" the same IP address that "server" has as the route to CJC> "client?" That is, there aren't any aliases on "router's" interface CJC> with "server" making problems? "router" have not any aliases on it's interfaces. Seems like problem is in FreeBSD 4.5-RELESE. "Server" with installed 4.4-RELEASE worked without any problems. -- Sincerely, e-mail: alexl@alkar.net Alexey Luckyanchikov To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message