Very long DNS lookups inside my network

Posted by Nuno Cordeiro on Super User See other posts from Super User or by Nuno Cordeiro
Published on 2012-06-03T09:58:35Z Indexed on 2012/06/03 10:43 UTC
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Filed under:

windows-7

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dns

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dd-wrt

Ever since I installed DD-WRT (v24-sp2 08/07/10 std-usb-ftp) on my router (RT-N16), my browsing got substantially slower. Using FirePHP I figured out that it's being caused by VERY long DNS lookups (~30 seconds). When the domain name was very recently accessed then speed is very good.

I tried changing DNS on the computer and I tried messing around with the options on DD-WRT. I have tried to configure the router with Google DNS and/or OpenDNS. My current DNS output after using ipconfig -all is: 192.168.1.1 208.67.220.220 8.8.8.8 208.67.222.222

Can someone help me debug and solve this problem? I'd like to snoop the requests themselves. How can I know which DNS requests are being sent and which are failing/succeeding?

Note: I don't expect this to be relevant but my router is connected to the internet through an ONT.

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