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ashk's avatar
ashk
Icon for Cirrus rankCirrus
Dec 06, 2023

DNS load balancing for External Websites

Hello,

We currently manage an F5 DNS with a delegation for *.gslb.abc.com. Our external websites, namely ffff.org and gggg.com, are hosted on F5 LTM, and their respective IPs are provided in the GoDaddy DNS.

We are exploring the possibility of directing traffic for these websites to our F5 GTM, which would then distribute the traffic to either data center 1 or data center 2 based on pool availability.

Is it feasible to achieve this configuration through F5 GTM, or is it a configuration that needs to be addressed directly through GoDaddy? Thank you for your guidance on this matter.

application delivery

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  • zamroni777's avatar
    zamroni777
    Icon for Cumulonimbus rankCumulonimbus
    Dec 06, 2023

    actually that's common use case for f5 dns/gtm.

    a. ask godaddy to set f5 dns public IP as NS for ffff/ggg.com, OR
    b. add A records for f5 dns hostname in godaddy. then replace A record of ffff/ggg.com with CNAME/alias to that f5 gtm hostname.

    ip address you put in godaddy surely must be public ip.
    this public ip can be put in upfront network firewall that will NAT it to f5 private ip addresses.

    • ashk's avatar
      ashk
      Icon for Cirrus rankCirrus
      Dec 06, 2023

      Okay, seems like a way, 

      I will add NS record for a .org website of F5 GTM DNS listener. and allow firewall for that IP to listen externally on port 53. Then it will technically hit F5 GTM for name resolution and provide the IP based on the wide pool right? 

      What would be the host I need to configured on the F5 GTM wide IP name? is that ggg.gslb.org or pretty ggg.org will be enough. 

  • PhatANhappy's avatar
    PhatANhappy
    Icon for MVP rankMVP
    Dec 06, 2023

    Minor notes:
    The GTM/DNS modules is an intellegent dns resolver, it is never in line.   It provides an answer to a dns question.  i.e. - what is the IP address of   server.fff.org

    - if your websites are configured using the first level domain     ffff.org   and gggg.com   you will have to delegate the zone to the GTM.   If you are using a 2nd level domain, myserver.ffff.org   and myapp.ggg.org you can easily change the A record for them  to the cname with the delgation.

    This is less of a "f5" question and more of a proper DNS architecture problem.   What f5 introduces is the abiliy to monitor and provide HA based upon a tested condtion.

    • ashk's avatar
      ashk
      Icon for Cirrus rankCirrus
      Dec 06, 2023

      Understand, So I do required a deligation? 

      Example: myapps.org is hosted on GoDaddy point to 1.1.1.1

      My 2 virtual myapps servers are 1.1.1.1 and 2.2.2.2. In go daddy I can only provide one IP so There in the CNAME or NS feild under myapps.org I need to configure my GTM Listerner IP or Hostname? 

      its first level domain. Do I need to create a new Zone/Deligation in GTM or in my Internal DNS to listen on Internal dns and send to GTM? but it will change the URL to myapps.gslb.org? 

      so pointing directly to the GTM wont work ? 

       

      appreciate the help 🙂