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garberfc

join:2009-01-21
Burlington, CT

[DNS] Comcast slow/Timeout DNS lookup

I have the blast (50mb/s) and can see this throughput when downloading from newsgroups. But, my web browsing seems very slow.

I suspected DNS response time and I'm fairly certain that's the problem. Using ns_bench »SBC DSL FAQ »How do I test DNS lookup latency with ns_bench? to determine the response times from the comcast and OpenDNS servers, I consistently see timeouts with the comcast servers:

C:\temp\ns_bench\win32>ns_bench 75.75.75.75 75.75.76.76 208.67.222.222 208.67.220.220
Nameserver Response Time (ms)
min/avg/max/stdev/retries

75.75.75.75 15.00/15.50/16.00/0.35/3
75.75.76.76 53.00/53.00/53.00/0.00/3
208.67.222.222 41.00/41.00/41.00/0.00/0
208.67.220.220 41.00/42.40/46.00/1.85/0
Does this sound reasonable? When I change the DNS entries on computer to those of OpenDNS, it seems faster...