none
DNS slow -- HELP HELP

    Question

  • Hello Everyone,

    I need help on speed up our DNS server.

    Currently, our network had 2 DNS server 192.xxx.xxx.65 and 192.xxx.xxx.66 which run on Win2012R2.

    On .65 server, I had DNS setup as below:

    • Primary:  192.xxx.xxx.65
    • Secondary:  8.8.8.8

    On .66 server, I had DNS setup as below:

    • Primary:  192.xxx.xxx.66
    • Secondary:  8.8.8.8

    When user browse the internet, it take a while to get to the site.  Sometime, they got page error but after refresh then they access access the site.

    Is there anything wrong on our setup or what I need to look for to improve the speed.

    (FYI, our network speed is 50MB for up/down)

    Thanks

    Key

    Wednesday, January 18, 2017 12:26 AM

Answers

  • Hi key,

    >>Is there anything wrong on our setup or what I need to look for to improve the speed?

    Based on my experience, if you have two DNS servers, I would like to set them failover for each others.

    For example: server 65's dns lists could be: 192.*.*.65 & 192.*.*.66 and forwarder could contains 8.8.8.8

    server 66's dns lists could be: 192.*.*.66 & 192.*.*.65 and forwarder could contains 8.8.8.8.

    Also, using the root hints and static ip address for these two dns servers.

    Besides, " Sometime, they got page error but after refresh then they access access the site.", for this issue: please flush the dns caches on both client and server.

    In addition, other troubleshooting ways could be: nslookup & dns log and netmonitor and restart related services.

    Best regards,

    Andy


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by key50001 Wednesday, January 18, 2017 6:23 PM
    Wednesday, January 18, 2017 5:48 AM
    Moderator
  • Hi,

    Pl. set the DNS IPs as below:

    On .65 server-

    • Primary:  192.xxx.xxx.65
    • Secondary:  192.xxx.xxx.66

    On .66 server-

    • Primary:  192.xxx.xxx.66
    • Secondary: 192.xxx.xxx.65

    Also check the Root Hints/Forwarder what you have configure to resolve the external host.

    If require then you can add DNS IP address of your Service Provider/Global DNS IP in Forwarder as below:

    • Proposed as answer by Hello_2018Moderator Wednesday, January 18, 2017 7:12 AM
    • Marked as answer by key50001 Wednesday, January 18, 2017 6:22 PM
    Wednesday, January 18, 2017 6:02 AM

All replies

  • Wednesday, January 18, 2017 5:43 AM
  • Hi key,

    >>Is there anything wrong on our setup or what I need to look for to improve the speed?

    Based on my experience, if you have two DNS servers, I would like to set them failover for each others.

    For example: server 65's dns lists could be: 192.*.*.65 & 192.*.*.66 and forwarder could contains 8.8.8.8

    server 66's dns lists could be: 192.*.*.66 & 192.*.*.65 and forwarder could contains 8.8.8.8.

    Also, using the root hints and static ip address for these two dns servers.

    Besides, " Sometime, they got page error but after refresh then they access access the site.", for this issue: please flush the dns caches on both client and server.

    In addition, other troubleshooting ways could be: nslookup & dns log and netmonitor and restart related services.

    Best regards,

    Andy


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by key50001 Wednesday, January 18, 2017 6:23 PM
    Wednesday, January 18, 2017 5:48 AM
    Moderator
  • Hi,

    Pl. set the DNS IPs as below:

    On .65 server-

    • Primary:  192.xxx.xxx.65
    • Secondary:  192.xxx.xxx.66

    On .66 server-

    • Primary:  192.xxx.xxx.66
    • Secondary: 192.xxx.xxx.65

    Also check the Root Hints/Forwarder what you have configure to resolve the external host.

    If require then you can add DNS IP address of your Service Provider/Global DNS IP in Forwarder as below:

    • Proposed as answer by Hello_2018Moderator Wednesday, January 18, 2017 7:12 AM
    • Marked as answer by key50001 Wednesday, January 18, 2017 6:22 PM
    Wednesday, January 18, 2017 6:02 AM
  • Thank you Andy and Mr. Ved for your reply, the problems is now solved. The RootHint was pointing to one of the dead DC. I got the BIG improvement at 3400% on the speed after I made the change. I own you guys a drink now.
    • Edited by key50001 Wednesday, January 18, 2017 6:22 PM
    Wednesday, January 18, 2017 6:22 PM