fxp0 oversize frame problem

[Halid Faith]

Hello

I use FreeBSD 6.2-RELEASE #1 as a gateway server.
I have been receving a error message in /var/log/messages twice a month
recently;
kernel: fxp0: discard oversize frame (ether type 800 flags 3 len 1515 > max
1514)

As that problem has become, the concerning ethernet card has slow down very
much. I have been to reboot the server.

My ifconfig is below;
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=8<VLAN_MTU>
        inet 192.168.1.1 netmask 0xfffffff8 broadcast 192.168.1.255
        ether 00:90:27:d5:f6:3f
        media: Ethernet 100baseTX <full-duplex>
        status: active

What is the problem?
Do I have to increase MTU value of the fxp0 card?
What shall I do ?

Thanks