Well, I have an ISP router in which I have configured DNS Servers to use (Primary & Secondary) like Google DNS. It works just fine.

But now I have setup a computer with DNS server (Simple DNS Plus). I got it working by settings my internal DNS Server IP Address in computer. i.e.

So, instead of settings my internal DNS IP Address in every computer in my network, I want to setup DNS Server into my router. So on every DHCP request, computer get DNS Server to use.

So I configured it like this:

Primary DNS:
Secondry DNS: (left blank)

After applying and DNS Requests stop resolving. But strange part is DNS request does goes to DNS Server but maybe not returned back, because all DNS request were available in cache logs.

I don't know why this is not working, let me know if you have any solution or wordaround for this.


Update 1:


C:\Users\user>nslookup google.com
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
  • What OS is your internal server running? – DanBig Apr 6 '12 at 12:00
  • Its running Windows XP – Charandeep Singh Apr 6 '12 at 12:04
  • Setting a client machine to use its own IP as primary DNS is not going to work. If this is not an Active Directory configuration, your client machine should either use your ISPs DNS (if they provide DNS lookup, some dont) or use another, like Google ( or Level 3 ( – DanBig Apr 6 '12 at 12:08
  • Well, it is actually a Server installed with a DNS Server (Simple DNS Plus) and its works perfectly only if we setup DNS in every computer. But with using it with default gateway, it doesn't work. – Charandeep Singh Apr 6 '12 at 12:15

What's your Nslookup output? Have you setup your internal DNS server to forward requests it cant resolve to the router? Have you cleared your DNS resolver cache?


Login to the management interface of your modem/router and try to modify the Lan dhcp scope options for the dns server. if push comes to shove you can just connect your modem to your wireless router and control dhcp scope options (dns) from there. last case, manually assign your dns ip setting. this will work well for 1 or 2 pcs. anything over 5 will become a headache

  • I have updated question is nslookup result. Yes, I have set forwarding in DNS Server to Google DNS. Yes, I have cleared cache many times. – Charandeep Singh Apr 6 '12 at 10:31
  • Now if I go into my DNS Server, this DNS request is made and DNS Server was able to resolve it successfully. – Charandeep Singh Apr 6 '12 at 10:34
  • your client machine is using the gw instead of the DNS server. Change it manually to to confirm it indeed works. what kind of router are you working with? – RomeNYRR Apr 6 '12 at 10:40
  • To clear things its actually modem/router both provided by my ISP. Broadcom 96338L-2M-8M. One another thing, I think you're right about Gateway stuff, I tried same thing with a Wireless Router, again it doesn't work. But my wireless router have option to setup DNS with DHCP settings, with those it started working for wireless systems. – Charandeep Singh Apr 6 '12 at 10:54
  • Hello there, have you figured out something? I am thinking of settings up DHCP Server on my DNS Server system and disable router DHCP, so now I will be able to setup DNS correctly. simpledns.com/kb.aspx?kbid=1216 – Charandeep Singh Apr 6 '12 at 11:31

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