This trace study looks at how USIP looks in a trace when it is configured correctly and incorrectly.
This example trace was carried out in a practice lab environment with the following IP addresses:When USIP works, you can see the Client IP in the trace communicating directly with the backend. However the source MAC is the NetScaler:
On the backend server we can see the traffic coming from the client:
If the backend server is not configured with the SNIP as the Default Gateway, USIP will fail. This is how it looks in a trace:
A trace on the backend shows it is resetting the connection as it does not know how to get the packets back to the client:
CTX121974 - FAQ: USIP Address Mode of NetScaler