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Problem with DNS server 75.75.75.75?

New Poster

Problem with DNS server 75.75.75.75?

If I do a ping to 75.75.75.75, I get timeout errors.  But if I ping OpenDNS or the Level3 DNS servers, all is OK.  I liked the Comcast DNS server because it is faster when it works but the timeout errors will cause my browsing to slow-down.  What is going on with the 75.75.75.75 DNS server?

Problem Solver

Re: Problem with DNS server 75.75.75.75?

How is 75.75.76.76 reacting for you?

Expert

Re: Problem with DNS server 75.75.75.75?

FWIW, the default Comcast DNS servers are deliberately configured to de-prioritize / rate limit ICMP packet based ping probes, so pinging them is not a good method to use to gauge their performance.



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New Poster

Re: Problem with DNS server 75.75.75.75?

For me, 75.75.76.76 was doing the same behavior as all-75's.

 

So, if ping is not a good measure, what is?

 

BTW, when I first setup my router maybe 1 yr ago, I did the same tests, and the 75's was consistantly the fastest, with no timeouts.

Expert

Re: Problem with DNS server 75.75.75.75?

DNS benchmark tools such as these that measure actual resolution times are;

 

http://code.google.com/p/namebench/

https://www.grc.com/dns/benchmark.htm



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I am a fellow customer, volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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Frequent Visitor

Re: Problem with DNS server 75.75.75.75?

It is 8/13 and the same problem persists...
Expert

Re: Problem with DNS server 75.75.75.75?

Marked solved thread closed.



I am not a Comcast Employee.
I am a fellow customer, volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Mark the post as best answer!