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Slow DNS response

Posted on 1997-12-30
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Last Modified: 2013-12-23
The speed on my ISP is acceptable, however when contacting a site for the first time during a connection, it is incredibly slow.  It takes 17 seconds for the DNS lookup.  Once it gets the IP for a site, it moves quite fast.  It is also fast if I put in an IP address for a site rather than the name.  I've tried several settings:

1 -- Let the DNS server be decided by the server.
2 -- Setting the Primary DNS to the one my ISP gave me.
3 -- Setting the Primary DNS to an IP address that I use at school and the response seemed fast on.

However, each time, the lookup takes that 17 seconds... any ideas on how to cut down the lookup time?  I'd say it was the connection, but once the IP has been determined, it's the connection speed I'd expect.


Thanks... Ryan
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Question by:laze
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lyon earned 200 total points
ID: 1551223
If you are getting faster results when using a DNS address from school it is very possible that the DNS server that your ISP is using for name resolution is the culprit. If there are alot of users logged into the system and they are all requesting DNS lookups from the server at your ISP then the response time will be slow. Once the lookup is completed the information for that named address will be cached into memory so further hits to that site will be quicker since the system looks in memory instead of reuesting a DNS lookup. If your school's DNS server is producing faster results then you might want to think about using it as your DNS server on a regular basis. There is, however, nothing you can do from your system to speed up the process of name resolution other than what you are already doing. Here's a list of things to consider doing:
1) Contact your ISP and ask if they intend to beef up their servers and/or connections to speed up their DNS processes
2) Setup you machine at home to utilize the DNS server that gives you the best response to you requests
3) When possible, use the numeric addresses for the sites you are connecting to (This will eliminate DNS lookups)

Best of Luck,
Lyon
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Author Comment

by:laze
ID: 1551224
It was baffling me because from the computer in another room (my parents') everything was moving just fine... so I found another setting that was different... it turns on I had DHCP turned on for WINS resolution, which is what I use for the network when I'm at school... unfortunately, for some reason, it changed that TCP/IP setting that was bound to the dial-up adapter as well.  So I switched it and now I'm good to go.

Thanks for your time!... Ryan

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