Bandwidth Test and NAT?

Setup.
Two Bandwidth Test servers.
1 NAT client behind a CPE with two WAN IP addresses.
WAN IP addresses routed to the Bandwidth Test servers via different gateways.
The problem is I can transmit to the Bandwidth Test servers, but not receive (probably because of NAT.)
Any known work around?
Thanks,
Nic

Five years after your question, I ran into bandwidth tests not working through NAT; they get stuck at the setup phase.

This is a shame - traversing NAT is not that hard - and can be fixed.

Almost another year later, and not a single response? Really?