Glad I could help with the at trick!
So I ran a bandwidth test (netcat) having forced OFDM54... throughput was roughly 4x higher, from 160KB/sec to 600 KB/sec. Good progress!
Then I thought about transmit power... this "server" uses a cardbus extension for USB 2.0, and the card has a power socket. I have nothing I could plug in there, but...
Default settings -> 160 KB/sec
OFDM54 11g -> 600 KB/sec
ifconfig rum0 txpower 15 -> 1.1 MB/sec !!
ifconfig rum0 txpower 5 -> 1.1 MB/sec
ifconfig rum0 txpower 100 -> 1.1 MB/sec
Go figure...
At least I've now got 6x the original throughput, but it's still only 20% of what it can theoretically do and 25% of the 100 MBps wired interface going over power lines.
I'll see if I can find something else, but any other ideas are welcome.
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