Automatically detecting asymmetric routing
On the Asymmetric Routing page, these options are available for configuring automatic detection of asymmetric routing:
Enable Asymmetric Routing Detection detects asymmetric routes in your network.
Enable Asymmetric Routing Pass-Through enables pass-through traffic if asymmetric routing is detected.
If asymmetric routing is detected, the pair of IP addresses, defined by the client and server addresses of this connection, is cached on the SteelHead. Further connections between these hosts are passed through unoptimized until that particular asymmetric routing cache entry times out.
Detecting and caching asymmetric routes doesn’t optimize these packets. If you want to optimize asymmetric routed packets, you must make sure that the packets going to the WAN always go through a SteelHead either by using a multiport SteelHead, connection forwarding, or using external ways to redirect packets, such as WCCP or PBR.
For details, see the SteelHead Deployment Guide.