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Many tcp "Bad Checksum" on linux server. Does that mean LAN card is broken ?

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Last Modified: 2012-05-10
Hi,
 I've made tcpdump on a linux server - fedora 8.
when I open the cap file with wireshark I see a lot of Errors - at the TCP section :
Checksum: 0xa771 [incorrect, should be 0xa5f8 (maybe caused by "TCP checksum offload"?)]

I guess that's not normal. Does it mean that I have to change my LAN card ?
there are no kernel errors in /var/log/messages log

thank you.
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