reeBSD 8.1 unstable network connection

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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. I have further checked with my network admin and he claim that the problem is being caused by the network driver which cannot support the load whereby he tried to ping using huge packet size (around 15k) and my server will drop packet consisten (HowTos)