tcp errors detection

[Victor lyamtsev <vlyamtsev () gmail com>]

Hi,

 how can i locate retransmission error for TCP sequence in wireshark capture ?
Should I look for ACK with repeated sequence number ?
For example:

[ACK] Seq = 1355 Ack = 13409 ...
[ACK] Seq = 1355 Ack = 13500

How can i detect checksum errors from the capture ?

Thanks,
-vvv
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