dns not resolving automatically

we have windows 7 computers.  for some reasons I had to enter another dns to get webpages to come up.  We substituted the switch and could not find nothing wrong with the router.

I had to  put the dns in all the computers today.  I called the isp to check the dns server address he gave me.

Any suggestions
GeorgeidpAsked:
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Muhammad MullaSystems AdministratorCommented:
Is this in a business environment with AD DNS?

It is possible that your DNS forwarders are no longer valid.

In the DNS management console, right-click on your DNS server > properties and then check in the Forwarders tab. Verify that the DNS servers work and then repeat with other DNS servers in your network.
Aland CoonsSystems EngineerCommented:
Do you use DHCP on the LAN?
Do you have a server with DHCP and DNS or are you using DHCP on the router?
Is the DNS on the workstations directed to a WAN address, the router or an internal server?

Need a lot more information to begin assisting.
GeorgeidpAuthor Commented:
The dns is supplied from the router.  Primary and secondary dns.  These numbers were given to me by the isp.  All was working fine for years.  Just started last week.

I assigned 8.8.8.8 for the primary dns to get it working.
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David Johnson, CD, MVPOwnerCommented:
isp's dns servers are notoriously horrible google public dns is pretty good
run the dns benchmark https://www.grc.com/dns/benchmark.htm and see which is best for your location
Aland CoonsSystems EngineerCommented:
I agree with the comment that usually ISP DNS are "horrible" however if you use another non-geographic DNS (examples: Google, OpenDNS, Norton DNS) sometimes your browsing will end up "horrible" instead as the requests will not be load balanced.  Consider if you hit a major website that request could end up always going to a server in Ireland even though the server in India has almost no load on it right now.  DNS is often used to geographically load balance. This part (but not nearly all) of the reason anatomizing Tor browsers run so slowly.
My suggestion is to contact your ISP and find what DNS addresses you should be using as forwarders for external DNS lookup.  If the ones you have are not working let them know as it is their responsibility to provide as a part of their service contract.
GeorgeidpAuthor Commented:
they gave me a primary and secondary dns address
Aland CoonsSystems EngineerCommented:
Were they different from the ones you were using?  When you used those DNS IP addresses are you able to resolve web addresses correctly and browse the Internet?
GeorgeidpAuthor Commented:
They are the same as the old dns servers.  They said they work.  I tracert them and they were ok to rcn.

did not get a chance to get into our router yet.  Too many users on.
Aland CoonsSystems EngineerCommented:
You can test the DNS servers without changing your router by
nslookup - DNS_Server

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For example:
C:\>nslookup - 8.8.8.8
Default Server:  google-public-dns-a.google.com
Address:  8.8.8.8

> google.com
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Non-authoritative answer:
Name:    google.com
Addresses:  2607:f8b0:4004:808::1007
          70.186.28.24
          70.186.28.22
          70.186.28.26
          70.186.28.21
          70.186.28.20
          70.186.28.25
          70.186.28.27
          70.186.28.23

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GeorgeidpAuthor Commented:
here is the nslookup.

thanks
net-lookup-1.png
Aland CoonsSystems EngineerCommented:
You need to replace the word "DNS_Server" with your DNS Server IP address.
NOTE: In my example I used 8.8.8.8

The command lets you test a DNS server without changing your DNS/IP settings.
I suggested you use this since you can't change your router settings right now.

TraceRt is a step up from Ping for troubleshooting but NSLookup actually performs a DNS call to the server.

nslookup - Replace_with_DNS_server_IP_address

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GeorgeidpAuthor Commented:
Thanks, When I can get ot the router in the AM, I will put the two ip addresses of RCN back in for primary and secondary dns.  Those are the ones that did not work.

I will let  you know once I do this.
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