The user is connected so:
WSxp-----INTERNET---->IP0:1679---->[IP0_SRVFIREWALL_IP1]------------>[IP_L0:1681 GWPOA_PROXY ]----->[IP_L0:1677 GWPOA ]

SRVFIREWALL use PAT for:
-->IP0:1679----->PAT------------>IP_L0:1681
IP0=213.130.10.244
IP_L0=172.16.16.230

GWPOA_PROXY PostOffice and GWPOA PostOfice are located on one server.

GWPOA - PostOffice with gw users
GWPOA_PROXY - PostOffice without gw users. This is Proxy PostOffice .
How it is correct to set up parameters in the "Network Address" tab for POA PostOffice GWPOA_PROXY?
What mast be in the fields:
"TCP/IP Address"
"External IP Address"
in this case ?

Serg