Re: Linux Router: TCP slow, UDP fast

I'm losing the will to live with this networking headache ! Please feel free to point me at a Linux list if NANOG isn't suitable. I'm at a loss where else to ask.

The linux-net might be more appropriate indeed.

With and without shaping and over different bandwidth providers using the e1000 driver for an Intel PRO/1000 MT Dual Port Gbps NIC (82546EB) I can replicate full, expected throughput with UDP but consistently only get 300kbps - 600kbps throughput _per connection_ for outbound TCP

I've seen this behavior as the result of duplex mismatches. (The tcp settings are end system matters and do not affect how the router forwards traffic.)