From owner-freebsd-hackers Fri Jan 4 2: 7:41 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from piggy.rz.tu-ilmenau.de (piggy.rz.tu-ilmenau.de [141.24.4.8]) by hub.freebsd.org (Postfix) with ESMTP id 2913E37B419 for ; Fri, 4 Jan 2002 02:07:39 -0800 (PST) Received: from gtw.hh59.local (pD9508B90.dip.t-dialin.net [217.80.139.144]) (authenticated (0 bits)) by piggy.rz.tu-ilmenau.de (8.11.1/8.11.1) with ESMTP id g04A7VH04324 (using TLSv1/SSLv3 with cipher EDH-RSA-DES-CBC3-SHA (168 bits) verified NO) for ; Fri, 4 Jan 2002 11:07:37 +0100 (MET) Received: from walnut.hh59.local (walnut.hh59.local [192.168.2.10]) by gtw.hh59.local (8.11.3/8.11.3) with ESMTP id g04AMK813235 (using TLSv1/SSLv3 with cipher EDH-RSA-DES-CBC3-SHA (168 bits) verified FAIL) for ; Fri, 4 Jan 2002 11:22:24 +0100 (CET) Received: (qmail 2436 invoked by uid 1000); 4 Jan 2002 10:08:06 -0000 Date: Fri, 4 Jan 2002 11:08:06 +0100 From: Martin Kaeske To: freebsd-hackers@freebsd.org Subject: path_mtu_discovery Message-ID: <20020104110806.A2138@walnut.hh59.local> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hello, I'm using FreeBSD-4.4-STABLE and have an OpenBSD-2.9 router to connect to the internet (via DSL). If i try to do a cvsup (cvsup.de.freebsd.org, cvsup2.de.freebsd.org, cvsup.freebsd.org) i'm getting a lot of "icmp: Destination unreachable, need to frag " messages and cvsup fails (timeout). The curious thing is if i disable net.inet.tcp.path_mtu_discovery or if i lower the MTU to 1488, everything is fine (of course). That's why i wanted to ask wether FreeBSD fails to lower the MTU (it should lower it due to the icmp messages, shouldn't it?) or is there any pppoe specific problem between me and the cvsup servers? Martin PS: AFAICS cvsup is the only problem ftp/http/nntp works fine -- The instructions said to use Windows 98 or better, so I installed FreeBSD. -- Jim Levie in comp.unix.bsd.freebsd.misc -- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message