> Does anyone have any thoughts? I pasted some details below increase they > have a bearing. > Remember that LACP (802.3ad) uses a hash algorithm (configurable on how it's carried out and whether you use mac addresses, dst/src IPs and ports will vary quite often for optimisation) to pick a physical connection for the TCP flow ... and that will stay over the physical connection. As such for any one given flow you'll see up to the speed of the physical interface the data is going over... the speed increases come with multiple systems communicating with that server and with the right pick of hashing function having those connections go over differing interfaces.