From owner-freebsd-stable Wed Jun 20 13:43:19 2001 Delivered-To: freebsd-stable@freebsd.org Received: from femail4.sdc1.sfba.home.com (femail4.sdc1.sfba.home.com [24.0.95.84]) by hub.freebsd.org (Postfix) with ESMTP id 7315437B401 for ; Wed, 20 Jun 2001 13:43:16 -0700 (PDT) (envelope-from bmah@employees.org) Received: from intruder.bmah.org ([24.176.204.87]) by femail4.sdc1.sfba.home.com (InterMail vM.4.01.03.20 201-229-121-120-20010223) with ESMTP id <20010620204306.CHNQ27712.femail4.sdc1.sfba.home.com@intruder.bmah.org>; Wed, 20 Jun 2001 13:43:06 -0700 Received: (from bmah@localhost) by intruder.bmah.org (8.11.3/8.11.3) id f5KKh5e31524; Wed, 20 Jun 2001 13:43:05 -0700 (PDT) (envelope-from bmah) Message-Id: <200106202043.f5KKh5e31524@intruder.bmah.org> X-Mailer: exmh version 2.3.1 01/18/2001 with nmh-1.0.4 To: "Kevin Oberman" Cc: "David W. Chapman Jr." , "Sam C. Zamarripa" , freebsd-stable@FreeBSD.ORG Subject: Re: Weird Traceroute/Ping In-Reply-To: <200106201811.f5KIBZc11576@ptavv.es.net> References: <200106201811.f5KIBZc11576@ptavv.es.net> Comments: In-reply-to "Kevin Oberman" message dated "Wed, 20 Jun 2001 11:11:35 -0700." From: "Bruce A. Mah" Reply-To: bmah@FreeBSD.ORG X-Face: g~c`.{#4q0"(V*b#g[i~rXgm*w;:nMfz%_RZLma)UgGN&=j`5vXoU^@n5v4:OO)c["!w)nD/!!~e4Sj7LiT'6*wZ83454H""lb{CC%T37O!!'S$S&D}sem7I[A 2V%N&+ X-Image-Url: http://www.employees.org/~bmah/Images/bmah-cisco-small.gif X-Url: http://www.employees.org/~bmah/ Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_-335152755P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Wed, 20 Jun 2001 13:43:05 -0700 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG --==_Exmh_-335152755P Content-Type: text/plain; charset=us-ascii If memory serves me right, "Kevin Oberman" wrote: > To determine the effective bandwidth of a connection you need to know > the lowest bandwidth of any link between you and the other end. pchar > (in ports) is a pretty good way to look at this, although it can be > misleading in some conditions. (I'm pretty sure Kevin knows this, but for everyone else, I'm the guy who wrote pchar.) Yes, pchar has some problems trying to measure some types of links. The most recent version (1.4) tries to address some of these problems, but it's still hard to measure subnets several hops away with unknown L2 topologies. Happily, if I understand the current issue (sorry, came into the middle of the thread), you don't need anything as detailed as pchar. Another tool called pathrate does a nice job of measuring the capacity of a path between two hops; while it doesn't try to measure individual hops, it uses a different methodology that doesn't suffer some of the problems of pchar. It's home page is: http://www.cis.udel.edu/~dovrolis/bwmeter.html pathrate isn't in the ports collection; I was thinking of doing a skeleton for it once it settles down a bit; current version I have is 2.0.3. Cheers, Bruce. --==_Exmh_-335152755P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: Exmh version 2.3.1+ 05/14/2001 iD8DBQE7MQrZ2MoxcVugUsMRAnPbAKDIABEuTLGThBWytV+XRG2zECyAwwCfbegf aWq82VyvlfiuLliZIPrRFRE= =pFeH -----END PGP SIGNATURE----- --==_Exmh_-335152755P-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message