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https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4485

--- Comment #1 from Jaap Keuter <jaap.keuter@xxxxxxxxx> 2010-02-12 23:30:54 CET ---
What about this:
$ ./tshark -v
TShark 1.2.7 (SVN Rev 31743)
.....

$ ./tshark -V -o udp.check_checksum:false -r ~/capture/DHCPinform.pcap
.....
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 308
    Checksum: 0x6acf [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
.....
$ ./tshark -V -o udp.check_checksum:true -r ~/capture/DHCPinform.pcap
.....
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 308
    Checksum: 0x6acf [correct]
        [Good Checksum: True]
        [Bad Checksum: False]
.....

So what are you missing exactly?

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