GTM and static resolve ip

I think you can do this without pool members at all. Simply use a GSLB iRule on the company.com wide IP to do the resolution statically. For example, something like this:

when DNS_REQUEST {
   if { [DNS::question name] ends_with ".company.com" } {
      if { [IP::addr [IP::client_addr] equals 10.10.10.0/24] } {
         host 10.1.1.1
      } elseif { [IP::addr [IP::client_addr] equals 10.20.20.0/24] } {
         host 10.2.2.2
      }
   }
}
`

Adjust the comparison operator after the "ends_with" depending on your wide IP configuration. The only outstanding question is what you want to do if the query is for company.com but not from either of the two networks. You could always add an else condition that returned a REFUSED response. For example:

`} else {
   DNS::header rcode REFUSED
   DNS::return
}