~~~
                       ( net )
                         ~~~
                          |
                          |
                          |
                      ----------
                     |  switch  |
                      ---------- 
                      /        \
                     /   VIP    \
             ----------      ----------
            |   FW1   |       |  FW2  |
             ----------      ----------
                    \    VIP   /
                     \        /
                     ----------
                    |  switch  |
                     ----------
                      /      \ 
                     /        \
              ----------     ----------
             | server1  |   | server2  |
              ----------     ----------


FW2
out XL2 204.18.109.138 
mid XL1 10.10.10.1
in XL0 172.16.0.2
shared carp 0-1-2 204.18.109.140
shared carp2 and carp 3 172.16.0.50

FW1
out XL2 204.18.109.139
mid XL1 10.10.10.2
in XL0 172.16.0.1
shared carp 0-1-2 204.18.109.140
shared carp2 and carp 3 172.16.0.50


SERVER 1
ip 172.16.0.100/24
GW 172.16.0.50 
SHARED 172.16.0.200


SERVER 2
ip 172.16.0.101/24
GW 172.16.0.50 
SHARED 172.16.0.200