A standard virtual server has been associated with a pool with multiple members.

Understanding the default behavior of aStandard Virtual Serverregarding address and port translation is fundamental to BIG-IP administration.

Source Address Translation (SNAT):By default, the BIG-IP system doesnotperform Source Address Translation (SNAT). This means that the packet's source IP address (theClient IP) remains preserved as it passes through the BIG-IP to the pool member. This is critical for backend servers to identify the original client for logging and security purposes. Therefore, the client IP address is unchanged between the client-side and server-side connections.

Destination Address Translation (DAT):By default, a Standard Virtual Serveralwaysperforms Destination Address Translation. The BIG-IP system changes the destination IP from the Virtual Server's IP address to the IP address of the specificPool Memberselected by the load balancing algorithm. Consequently, the server-side destination IP is different from the client-side destination IP.

Port Translation:By default,Port Translationis enabled. If a Virtual Server is listening on port 80 and the selected pool member is configured for port 8080, the BIG-IP will translate the destination port. Even if the ports happen to be the same, thesettingallows for change, whereas the default SNAT setting (None) ensures the client IP remains static.