From owner-freebsd-net@FreeBSD.ORG Mon Jun 21 16:05:23 2010 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 945391065672 for ; Mon, 21 Jun 2010 16:05:23 +0000 (UTC) (envelope-from freebsd-net@m.gmane.org) Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by mx1.freebsd.org (Postfix) with ESMTP id 4FFB58FC08 for ; Mon, 21 Jun 2010 16:05:23 +0000 (UTC) Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1OQjUu-00049u-EO for freebsd-net@freebsd.org; Mon, 21 Jun 2010 18:05:20 +0200 Received: from firewall.andxor.it ([195.223.2.2]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 21 Jun 2010 18:05:20 +0200 Received: from lapo by firewall.andxor.it with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 21 Jun 2010 18:05:20 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-net@freebsd.org From: Lapo Luchini Date: Mon, 21 Jun 2010 18:05:12 +0200 Lines: 16 Message-ID: <4C1F8DB8.6080804@lapo.it> References: <4B98CF44.2080605@keff.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: firewall.andxor.it User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.1.8) Gecko/20100219 SeaMonkey/2.0.3 In-Reply-To: <4B98CF44.2080605@keff.org> X-Enigmail-Version: 1.0.1 OpenPGP: id=C8F252FB Subject: Re: 6to4/stf relay X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2010 16:05:23 -0000 Sebastian Hyrwall wrote: > stf0 in FreeBSD has a non-changeable mtu of 1280. If you're setting up a > 6to4-relay using FreeBSD doesn't this break stuff for other end-hosts > using your relay? Linux for example has a default MTU of 1480. A lower-than-strictly-necessary MTU might be less efficient, but for sure doesn't break anything. OTOH 20 bytes less than the underlying used IPv4 connection (which is known at the time of creation) should be a better default (?). -- Lapo Luchini - http://lapo.it/ “The Magic Words are Squeamish Ossifrage” (Ron Rivest, RSA-129 challenge, 1977)