URL to redirect onto one of the web server

Hi,

 

I have got problem with URL to divert on to one of the web server. The public IP is already been used by website like : www.abc.com and my client has created new link like www.bml.abc.com.au which has same IP address.

 

Whenever someone request for web URL www.abc.com it comes to firewall and it does NAT and virtual IP address will redirect request on to web server.

 

 

One more thing to inform you that we have got 4 web server and they are running different web applications.

 

 

My main question is that if my above mentioned URLs user same public and virtual IP addresses then how would I redirect specifically onto different web server.

 

 

my webserver IP is : 10.254.x.x

 

Virtual IP: 10.254.248.x

 

public IP: 59.x.x.x

 

 

how would I write irule to redirect URL onto specific web server....

 

 

Your quick help will be much more appreciated..

 

 

Thanks,