How to Flush Your DNS

[Nomar]

Flush DNS is something I use a frequently while doing a website transfer. You can use the command ipconfig /flushdns to flush the DNS resolver cache. Open the command prompt and type the following:

ipconfig /flushdns

hit enter and:

Windows IP Configuration
Successfully flushed the DNS Resolver Cache.

[72666]

Ahh, good to know! better than waiting a few hours to see if it all cleared up!

[ironman]

I have tried this but why it is required , can anyone tell me .
Sorry for being a noob

[niks00789]

DNS resolves machine names to IP addresses.

When a DNS lookup is placed by a client ( to obtain the IP of a named target machine ), DNS returns the IP to the client. The client will then be able to connect to the target using the returned IP address.

To speed up further connections, the client also stores the result in cache, as a DNS query will check the cache before passing the query to a DNS server to resolve.

If a target changed it's IP after the clients initial DNS query, the cache would hold an incorrect reference ( the old IP obtained from it's DNS lookup ). The client would then be attempting to connect to an incorrect IP & therefore fail to hit the target.

Flushing DNS empties the cache. When the client then tries to lookup the target again, it has no references to the name in the empty cache, so; it has to resort to a query of the DNS server again.

Source :

http://uk.answers.yahoo.com/question/index?qid=20070607015618AAe3K2S

[sai_sidd]

Wow. Thanks a lot. At least now i dont have to wait for it to clear up.

[bashi]

Wow. Thanks a lot. At least now i dont have to wait for it to clear up.

same! very nice