No way to specifcy an interface as per -B in iperf

[timchown]

Hi,

It would be really useful to be able to specify an interface for tests when you have multiple interface systems, e.g. when using Ethr as a perfSONAR plugin and you have a server with a throughput, latency and management interface and you want Ethr on the throughput interface.

The alternative is messy host routes.

Thanks!
Tim