Date: Wed, 22 Nov 1995 20:17:49 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: grog@lemis.de Cc: jmb@kryten.atinc.com, hackers@freebsd.org Subject: connectivity problems... Message-ID: <199511221917.UAA14961@labinfo.iet.unipi.it> In-Reply-To: <199511211255.NAA13591@allegro.lemis.de> from "Greg Lehey" at Nov 21, 95 01:54:46 pm
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> Jonathan M. Bresler writes: > > > > i have heard horror stories about non-us > > connectivity--several nets in one country reach each other by way of the > > usa. is this really teh case ?? > > 'fraid so. This is how I get to Joerg, who's only about 150 miles > down the road: ... traceroute output omitted > > if so regional majordomo's need to reflect the net topology more > > closely than a simple divison along political boundaries. > > There's also a question of net load. If you look at the figures > above, you'll notice that the time from me to ipgate2.win-ip.dfn.de > was under .5 second. From there to sax.sax.de (all inside Germany, in > the DFN), things rapidly go to hell. I'm told that this is a normal > state of affairs. same here. The nice thing is, you ping the remote side (the US in our case) and get up to 70% of packet losses, practically independent of the size of the packet, and often also of the sending rate (tried with ping -s xxx -f). For those packets which pass through the RTT has a surprisingly low variance (considering the loss rate), and the bandwidth is equally high (>100Kbit/s). I am wondering how big are the receive queues on these routers, and if they have configuration or software problems! Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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