From owner-freebsd-net@FreeBSD.ORG Wed Dec 10 17:00:31 2003 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A8C8B16A4D2 for ; Wed, 10 Dec 2003 17:00:31 -0800 (PST) Received: from mail.sandvine.com (sandvine.com [199.243.201.138]) by mx1.FreeBSD.org (Postfix) with ESMTP id 515B743D2D for ; Wed, 10 Dec 2003 17:00:12 -0800 (PST) (envelope-from don@sandvine.com) Received: by mail.sandvine.com with Internet Mail Service (5.5.2657.72) id ; Wed, 10 Dec 2003 20:00:11 -0500 Message-ID: From: Don Bowman To: 'Andrea Venturoli' , freebsd-net@freebsd.org Date: Wed, 10 Dec 2003 20:00:10 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain; charset="iso-8859-1" Subject: RE: Two ISP connections X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Dec 2003 01:00:31 -0000 From: Andrea Venturoli [mailto:ml.ventu@flashnet.it] > ** Reply to note from Barney Wolff Wed, > 10 Dec 2003 11:39:00 -0500 > > > > I don't know of anything published that does this, but it's easy to > > write a perl or shell script that pings the router at the adsl isp > > and does the necessary things when it disappears and reappears. > > Mmh, only problem is one of the ISP is famous for blocking > ICMP as a whole, so no pings work. I haven't tried this > particular line yet, but I may need to use come other protocol. > > see the lft port (layer 4 traceroute) http://www.mainnerve.com/lft/ you can use this to get an ICMP response (albeit not echo) from your isp this way. [you can't really block icmp would fragment, it would break PMTU]. --don