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Jason_F's avatar
Jason_F
Icon for Nimbostratus rankNimbostratus
Jan 16, 2019

GTM sub-domain query flow

I would like to know who's DNS Server will have the DNS query to GTM that acting as subdomain.

 

External DNS: company.com (PUBLIC)

 

IN CNAME

 

delegate wip.company.com

 

wip IN NS gtm.domain.com

 

gtm.domain.com IN A

 

As a client, i'm using 8.8.8.8 as a DNS Server. When I performed nslookup to . I want to know who's DNS server is the one sending DNS query to GTM, is it the 8.8.8.8(Client DNS) or the External DNS (company.com)?

 

Thanks!

 

application delivery
BIG-IP DNS

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  • Rico's avatar
    Rico
    Icon for Cirrus rankCirrus
    Jan 16, 2019

    The queries will come from the Client DNS server. Once the query reaches the CNAME record on the External DNS server, the Client DNS will attempt to restart the DNS query process but instead it will search for the domain name listed in the CNAME record.