Paul on Tue, 22 Oct 2002 00:23:20 -0400


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Re: [PLUG] DNS Problem Now 

From my dial-up the traceroute is much shorter.

traceroute to 207.172.3.8 (207.172.3.8), 30 hops max, 38 byte packets
1 10.65.54.97 (10.65.54.97) 133.332 ms 129.674 ms 119.530 ms
2 ge6-0-0.gw1.atw.pa.rcn.net (209.122.64.33) 120.375 ms 120.181 ms 109.769 ms
3 ge0-0-0.core1.atw.pa.rcn.net (208.59.89.82) 119.095 ms 119.658 ms 109.757 ms
4 pos1-1.core1.phdl.pa.rcn.net (208.59.95.50) 119.748 ms 119.655 ms 109.761 ms
5 pos6-0.core2.nyw.ny.rcn.net (207.172.19.7) 119.750 ms 109.616 ms 119.692 ms
6 ge1-0-0.gw3.nyw.ny.rcn.net (207.172.15.87) 119.745 ms 119.658 ms 120.369 ms
7 watchmen.dns.rcn.net (207.172.11.72) 119.146 ms 120.292 ms 119.136 ms

But the last address is different.
21  corky.dns.rcn.net (207.172.3.141)  318.522 ms  338.460 ms  331.926 ms

This is a problem that comes up once in a while. When it happens name resolution doesn't happen. Level 2 tech support tried to blame it on "Client for Microsoft Networks" not being installed. They said that if I don't install it that connectivity would be unreliable. Yet, 99% of the time I don't have a problem connecting with Linux. Also, they support Macs, which, I doubt, have the same client software that Windows ships with. On top of that, when I have the DNS problem Windows also has the problem, even with the client loaded. So, I tend to believe that it's a network problem at their end.


William H. Magill wrote:

Bill's traceroute points out a problem that I see more and more frequently all around the net these days... INCREDIBLY HUGE hop-counts. Hop-counts have been steadily increasing around the net for years, so this kind of hop-count is actually pretty "normal" these days. But while hop-counts in and of themselves are not a significant issue, the fact is that they put that many more places for congestion to occur between you and your destination... and the current IP default is 30 hops! (It used to be 10.)

The roundtrip times indicate that significant congestion is probably occurring on the network involved. The Internet is surprisingly robust... but it does get overloaded frequently... especially the further away you get from the backbone carriers on to various sub-carriers. Topology is the name of the game. 


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