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prashant_alhat_'s avatar
prashant_alhat_
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Apr 12, 2018

F5 DNS

Hello All,

 

I have two ISP links & for the same we create two listeners. in pool we create 8 VS for load balance 4 IP one ISP & 4 IP second ISP.

 

when we check dns from public i got my pool IP. is it right ?

 

because my understanding is when check nslookup we should get listeners IP than to pool ip.

 

Pleas correct me which ip i get listeners or pool IP ?

 

listeners two ip i have provide two register team bind against domain name .

 

2 Replies

  • To allow DNS to resolve, you only need one DNS listener IP: TCP and UDP

     

    -How to setup a DNS Zone

     

    You are wanting to load balance multiple internal DNS servers and have one external IP to "listen" for DNS requests.

     

    VIP(Public IP) -> Pool(multiple Private IP DNS servers)

     

    Nslookup will show the DNS server's IP that is configured on your box (ipconfig /all DNS IP) and it will show the Non-Authoritive resolution for the FQDN you are looking up.

     

    PS F:> nslookup foobar.com Server: lala.meow.blahblah.com Address: 10.1.1.11 <---My local Private IP DNS server seen via "ipconfig"

     

    Non-authoritative answer: Name: foobar.com Address: 162.241.216.134

     

    Google search to help understand "Recursive DNS"

     

  • When we check dns from public i got my pool IP. is it right ? YES.

     

    Pleas correct me which ip i get listeners or pool IP ? Pool IP.

     

    Think of the GTM as a DNS server. The listener is like the IP:53 on the DNS server. The pool members are your Resource Records(A, MX, and so on.)

     

    Hope it helps!

     

    David Pasch