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Date: Thu, 04 Dec 2008 09:40:14 +1100 From: grenville armitage <garmitage@swin.edu.au> To: "nanog@nanog.org" <nanog@nanog.org> In-Reply-To: <084962C061414240A0CDB4BE328A9B2D0BB10BAED8@GVW1100EXC.americas.hpqcorp.net> Errors-To: nanog-bounces@nanog.org Lee, Steven (NSG Malaysia) wrote: > Hi all, do you have any recommended tools that can measure latency/delay hop by hop basis? Preferable the tools can measure the running (live) traffic. > > Regards, > Steven Lee Not necessarily hop-by-hop, and measures RTT rather than one-way delay, but if you can packet-sniff at two points in your network our SPP (Synthetic Packet Pairs) tool for passive round trip time estimation might be of interest - http://caia.swin.edu.au/tools/spp/documentation.html Key benefits - you don't need tight clock synchronisation between measurement points, and you can measure RTT using existing traffic flowing across your network (no additional traffic needs to be injected). Key downside - its a research project, only tested under FreeBSD, and may be entirely unsuitable :) cheers, gja
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