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New Visitor
AnthonyKozlowsk
Posts: 2
Registered: ‎05-15-2013
Accepted Solution

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?

Regular Problem Solver
johkal
Posts: 470
Registered: ‎10-28-2006

Re: Problem with DNS server 75.75.75.75?

How is 75.75.76.76 reacting for you?

Connection Expert
EG
Posts: 42,562
Registered: ‎12-24-2003

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.

New Visitor
AnthonyKozlowsk
Posts: 2
Registered: ‎05-15-2013

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.

Connection Expert
EG
Posts: 42,562
Registered: ‎12-24-2003

Re: Problem with DNS server 75.75.75.75?

[ Edited ]

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

Contributor
rjo72223
Posts: 7
Registered: ‎07-27-2010

Re: Problem with DNS server 75.75.75.75?

It is 8/13 and the same problem persists...
Connection Expert
EG
Posts: 42,562
Registered: ‎12-24-2003

Re: Problem with DNS server 75.75.75.75?

Marked solved thread closed.