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Help testing Cogent DNS on a Cogent line

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  #1  
Old 01-19-2007, 10:21 AM
eger eger is offline
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Location: Bay Area, CA
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Help testing Cogent DNS on a Cogent line


I am having a strange DNS issue on a Cogent circuit using Cogent DNS servers at 66.28.0.45 and 66.28.0.61. What is happening is that some domain requests will timeout the first try. Then subsequent tries will be quick with no timeouts.

I am having a very hard time getting through to Cogent that there might be an issue somewhere and I was wondering if anyone on a Cogent line using the same Cogent DNS servers could also do a test for me to and see if you can reproduce any timeouts.

How I am testing:
- Open nslookup (in linux use: nslookup -timeout=2, windows defaults to 2 seconds)
- Picking a random domain name (favorite cereal.com, movie title.com, brand name.com, random word.com)
- Repeating test for same domain if timeout occurs to see the next query resolve instantly

Here is an example of what Is happening for me:
Code:
[eger@womp ~]# nslookup -timeout=2
> superman.com
;; connection timed out; no servers could be reached
> superman.com
Server:         66.28.0.45
Address:        66.28.0.45#53

Non-authoritative answer:
Name:   superman.com
Address: 64.12.47.7
> napaautoparts.com
;; connection timed out; no servers could be reached
> napaautoparts.com
Server:         66.28.0.45
Address:        66.28.0.45#53

Non-authoritative answer:
Name:   napaautoparts.com
Address: 208.254.241.70
>
I picked 2 random domains (that were likely not cached at the name server) and they both timeout the first try. Anyone else able to replicate this?



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  #2  
Old 01-19-2007, 01:48 PM
paule123 paule123 is offline
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Join Date: Sep 2005
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I'm not on Cogent, but I got the same results you did (timeout on first try, then ok after that)

  #3  
Old 01-19-2007, 01:55 PM
Jeremy Jeremy is offline
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Location: North Hollywood, CA
Posts: 2,541
Overloaded DNS servers maybe? no idea really.

I use 4.2.2.2 or 4.2.2.1

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  #4  
Old 01-19-2007, 02:23 PM
eger eger is offline
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Join Date: Feb 2004
Location: Bay Area, CA
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Quote:
Originally Posted by Jeremy
Overloaded DNS servers maybe? no idea really.

I use 4.2.2.2 or 4.2.2.1
Strange thing is, I also tested 4.2.2.1 and 4.2.2.2 using Cogent and same problem happens. Get random timeouts on domains the first try.

  #5  
Old 01-19-2007, 03:50 PM
Jeremy Jeremy is offline
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Join Date: Feb 2003
Location: North Hollywood, CA
Posts: 2,541
hmm i dont have a problem against 4.2.2.2 / .1

Testing against cogent i get timeouts, network problem ??

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