F5 WOM Question

From GUI " WAN Optimization ›› Local Endpoint ›› Properties"

 

The option SNAT , has 3 possibilities in drop down menu : None , Local & Remote .

 

i chacked the documentation & found the explanation fro each & it is below , i understood it but i need to know why it is mentioned that :" Use Remote when an appliance that uses NAT is located between the WAN Optimization endpoints "

 

below is explanation from Documentation :

 

SNAT :

 

Specifies the address the system uses as the source IP address of the

 

TCP connection on incoming traffic from the WAN Optimization Module to

 

the server.

 

*None: Indicates that the system uses the original connecting client IP

 

address.

 

 

*Local: Indicates that the system uses the endpoint IP address closest to

 

the destination.

 

Use this setting to make sure the return route also goes

 

through the BIG-IP system, so that both sides of the connection can be

 

optimized.

 

 

*Remote: Indicates that the system uses the source IP address of the

 

incoming iSession connection. Use this setting when an appliance that

 

uses NAT is located between the WAN Optimization endpoints. >>>>>>>>> Why is that ?