From owner-freebsd-current@FreeBSD.ORG Mon Apr 18 21:30:30 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4B34416A4CE for ; Mon, 18 Apr 2005 21:30:30 +0000 (GMT) Received: from mail.sorbs.net (mail.sorbs.net [203.15.51.62]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5E30E43D3F for ; Mon, 18 Apr 2005 21:30:29 +0000 (GMT) (envelope-from matthew@uq.edu.au) Received: from [10.200.254.98] by nemesis.sorbs.net (iPlanet Messaging Server 5.2 HotFix 1.21 (built Sep 8 2003)) with ESMTPSA id <0IF500G0QVRH6S@nemesis.sorbs.net> for freebsd-current@freebsd.org; Tue, 19 Apr 2005 07:30:54 +1000 (EST) Date: Tue, 19 Apr 2005 07:29:18 +1000 From: Matthew Sullivan To: freebsd-current@freebsd.org Message-id: <426426AE.2060406@uq.edu.au> MIME-version: 1.0 Content-type: multipart/signed; boundary=------------ms050808020208060303070103; micalg=sha1; protocol="application/x-pkcs7-signature" X-Accept-Language: en User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041231 Subject: DF (Don't frag) issues X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Apr 2005 21:30:30 -0000 This is a cryptographically signed message in MIME format. --------------ms050808020208060303070103 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Any reason why FreeBSD 5.2.1+ and 5.3-p9 set DF on all packets? I'm getting some real problems with VPNs, setting the interface MTU to 1024 fixes them, but it really is less than ideal. example with dominator [203.15.51.36] MTU at 1500, vpn server is at 203.15.51.36 (all interfaces are MTU 1500 except gif0 which is 1280), other end of the VPN has interfaces at MTU 1500 which serices the 10.200.254.0 network (wireless).... root@dominator:~# tcpdump -n | grep 10.200.254.98 tcpdump: listening on bge0 23:36:22.638202 10.200.254.98.33118 > 203.15.51.36.24: SWE 742813284:742813284(0) win 5840 (DF) 23:36:22.638259 203.15.51.36.24 > 10.200.254.98.33118: S 2275901409:2275901409(0) ack 742813285 win 65535 (DF) 23:36:22.680880 10.200.254.98.33118 > 203.15.51.36.24: . ack 1 win 5840 (DF) 23:36:22.683004 203.15.51.36.24 > 10.200.254.98.33118: P 1:43(42) ack 1 win 33304 (DF) 23:36:22.728581 10.200.254.98.33118 > 203.15.51.36.24: . ack 43 win 5840 (DF) . . . 23:36:23.474807 203.15.51.36.24 > 10.200.254.98.33118: P 2075:2171(96) ack 2425 win 33304 (DF) 23:36:23.475751 10.200.254.98.33118 > 203.15.51.36.24: P 2425:2537(112) ack 2075 win 10496 (DF) [tos 0x10] 23:36:23.510998 203.15.51.36.24 > 10.200.254.98.33118: P 2171:2219(48) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.511752 203.15.51.36.24 > 10.200.254.98.33118: P 2219:2315(96) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.514316 203.15.51.36.24 > 10.200.254.98.33118: P 2315:3643(1328) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.515060 203.15.51.61 > 203.15.51.36: icmp: 10.200.254.98 unreachable - need to frag (DF) 23:36:23.516599 203.15.51.36.24 > 10.200.254.98.33118: P 3643:3723(80) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.517255 203.15.51.36.24 > 10.200.254.98.33118: P 3723:3771(48) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.517337 203.15.51.36.24 > 10.200.254.98.33118: P 3771:3995(224) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.527961 203.15.51.36.24 > 10.200.254.98.33118: P 3995:4059(64) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.552652 10.200.254.98.33118 > 203.15.51.36.24: . ack 2171 win 10496 (DF) [tos 0x10] 23:36:23.561291 10.200.254.98.33118 > 203.15.51.36.24: . ack 2219 win 10496 (DF) [tos 0x10] 23:36:23.565812 10.200.254.98.33118 > 203.15.51.36.24: . ack 2315 win 10496 (DF) [tos 0x10] 23:36:23.570650 10.200.254.98.33118 > 203.15.51.36.24: . ack 2315 win 10496 (DF) [tos 0x10] 23:36:23.577811 10.200.254.98.33118 > 203.15.51.36.24: . ack 2315 win 10496 (DF) [tos 0x10] 23:36:23.577829 10.200.254.98.33118 > 203.15.51.36.24: . ack 2315 win 10496 (DF) [tos 0x10] 23:36:23.577880 203.15.51.36.24 > 10.200.254.98.33118: . 2315:3763(1448) ack 2537 win 33304 (DF) [tos 0x10] 23:36:23.578406 203.15.51.61 > 203.15.51.36: icmp: 10.200.254.98 unreachable - need to frag (DF) 23:36:23.582784 10.200.254.98.33118 > 203.15.51.36.24: . ack 2315 win -- Matthew Sullivan Specialist Systems Programmer Information Technology Services The University of Queensland --------------ms050808020208060303070103 Content-Type: application/x-pkcs7-signature; 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