FreeBSD 8.1 network error

I have 1 server running FreeBSD 8.1-RELEASE-p1.

phpsysinfo show network Err.

Code:
Network Usage
Device		Received	Sent		Err/Drop
em0		0.00 KiB	0.00 KiB	[color="Red"]2425[/color]/0

I remove ipfw & ipfilter from kernel. I turn off all internet services. But the Err has continued to increase. I take the hdd to another server for test, the problem persists. After a few hours, the server's connection will fail.

I try
[CMD=]netstat -i[/CMD]

It shows:
Code:
Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts Oerrs  Coll
em0    1500 <Link#1>      00:0c:29:9e:3c:3c     2678     0     0     2452     0     0
em0    1500 192.168.1.0   192.168.1.4            492     -     -      402     -     -
 
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