From owner-freebsd-net Wed Aug 8 11:27: 0 2001 Delivered-To: freebsd-net@freebsd.org Received: from chrobd01.vailsys.com (chrobd01.vailsys.com [63.210.102.138]) by hub.freebsd.org (Postfix) with ESMTP id 8BED537B40E for ; Wed, 8 Aug 2001 11:26:58 -0700 (PDT) (envelope-from hal@vailsys.com) Received: from area51.vail (area51.vail [192.168.129.30]) by chrobd01.vailsys.com (Postfix) with ESMTP id 2E9A94974 for ; Wed, 8 Aug 2001 13:26:58 -0500 (CDT) Received: from ghidra.vail (ghidra.vail [192.168.129.44]) by area51.vail (8.9.3/8.9.3) with ESMTP id NAA06682 for ; Wed, 8 Aug 2001 13:26:58 -0500 (CDT) (envelope-from hal@vailsys.com) Received: by ghidra.vail (Postfix, from userid 1000) id 95D4F66ABB; Wed, 8 Aug 2001 13:26:57 -0500 (CDT) To: freebsd-net@freebsd.org Subject: Re: gif MTU of 1280 ? References: <5.1.0.14.0.20010808101139.0277e010@marble.sentex.ca> <5.1.0.14.0.20010808101139.0277e010@marble.sentex.ca> <5.1.0.14.0.20010808121005.04473600@marble.sentex.ca> From: Hal Snyder Date: 08 Aug 2001 13:26:57 -0500 In-Reply-To: <5.1.0.14.0.20010808121005.04473600@marble.sentex.ca> Message-ID: <87wv4etnke.fsf@ghidra.vail> Lines: 10 User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Canyonlands) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Mike Tancsa writes: > When using 1280 in a strict tunnel mode, I have problems with large > packets from certain sites. Broken PMTU somewhere ? Not sure, but > setting the MTU to 1500 seemed to fix it. See rfc2923, if you haven't already. (I have seen problems if a router caches a path with shorter MTU - say 1280 - than what the interface is configured with - say 1500 - but that was on netbsd - posted on tech-net early this month). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message