I am New To GTM,So my question is simple
for example , i have dove.com, which was published over internet, but i want to resolve the DNS requeste on my local GTM, but if user from home request dove.com, it will go to (INNI DNS servers).
how come my GTM Box can select best server and provide the IP to user?
my guess, i have record on INNI DNS server, stating, get DNS request from my GTM BOX?
GSLB for top level domains can not be done through delegation (cname is not an option)
You have to be in line.
YOu need to create a delegated subdomain from your ISP to the GTM , meaning the CNAME will point to a NS which is the GTM that is the NS for that domain e.g.
Alternatively without delegation you need to be the Authoritative of the entire domain. you can host the Zone file on the GTM , make it the Auth server and add the DTM Wide-IP as the records you wish to provide to GSLB
Thanks Yaacov, I Understood, CNAME will Point out my GTM as DNS Server or NS for user try to access from public internet,
CNAME point out the FQDN name, I have Multiple GTM across global, with same FQDN,
what will happen in real scenario,
All your GTMs should sync in order to provide the same domain. Each GTM might respond differently to the A / AAAA query that was delegated to him from a CNAME.
Each GTM will have a wide-ip that holds the A record and behind it a pool of addresses based on your policy to resolve to.
Please see also : https://support.f5.com/kb/en-us/products/big-ip_gtm/manuals/product/gtm-implementations-11-6-0/4.html?sr=43504147