reeBSD 8.1 unstable network connectionview story

http://forum.directadmin.com – I have three FreeBSD 8.1 running on three different hardware and therefore consist of different network adapter as well (bce, bge and igb). I found that the network connection is kind of unstable which I have tried to scp some > 10MB file and found that I cannot always get the files completed successfully. My access switch is Huawei S3700-28TP-EI-AC. (HowTos)