Need to rewrite with LTM

Hi Rafi1 , 
  > may I understood in first part , if you want your to get internet access for your nodes you need to configure Forwarding virtual server on F5 to take the initiated traffic from your nodes to your internet path. 
follow this article , to configure Forwarding virtual server : 
https://support.f5.com/csp/article/K7595

> For FQDN hostname redirection , I think your clients can see the redirection on their browsers if you use " Redirect Action in LTM policy or HTTP::redirect by iRules ". 
As an adminstrator on F5 , if you want to be the only person who see this change of FQDNs , you need to " replace old FQDN to new FQDN  " by using HTTP::header not performing a redirection on FQDN hostnames level. 
By replacing the http header , you will find the new host name added in the entire http packet , but the Client will still see the old FQDN hostname in their browser. 
Follow this iRule to change hostname header on http packets : 

when HTTP_REQUEST {
if { ([string tolower [HTTP::host]] equals "globalserver.mydomain.com") }{
 HTTP::header replace Host "internalserver.com"
}
}

Tell me first if this meets your needs or not , if not clarify your request exactly , if yes " for changing host header instead of redirection " we can add more conditions for the rest of uri paths that you want to add. 

I will wait your Feedback 

Thanks 

Hello Rafi, if I'm not mistaken you're having the same issue as this post here. 

- globalserver.mydomain.com should resolve to your VS IP 
- if SSL is in place, you need a clientSSL profile with a certificate that matches "globalserver" SNI (or wildcard for *.mydomain.com) 
- you need HTTP profile on the vitual server to parse request elements 
- if backend server speaks SSL, you also need a serverSSL profile

iRule should be pretty simple, this code will rewrite client request before sending it to server -- meaning it will be transparent to client. 

when HTTP_REQUEST {
  if {[string tolower [HTTP::host]] eq "globalserver.mydomain.com" }{
    HTTP::header replace Host "internalserver.com"
    HTTP::uri "/portsluser/main#page/"
  }
}

My only concern would be that you have hash "#" character in URI, which is a reserved character that is usually only interpreted by client browser (usually not passed to server) to identify a fragment.