Self IP for External VLAN on Active/Active Configuration

1. Do i need self ip for External VLAN on each device? I really don't want to waste our public ip.yes, you need seflip on each device. anyway, you know virtual server address doesn't need to be in the same subnet as selfip, don't you?

 

 

sol11880: BIG-IP objects can be configured on a different subnet than the self IP address

 

http://support.f5.com/kb/en-us/solutions/public/11000/800/sol11880.html

 

 

2. Suppose our web server will accessible from both public and office network, do i need to create 2 VS or just one VS (put it on DMZ VLAN) and redirect traffic from public ip using NAT?either could be fine.

 

 

I want to implement active/active configuration using two BigIP 4200. My plan is to put both device to host my web server without firewall in front of them.you know one virtual server address can be hosted on only one bigip at a time, don't you?