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where is a packet with invalid tcp initial seq no discarded?

where is a packet with invalid tcp initial seq no discarded?

where is a packet with invalid tcp initial seq no discarded?

(OP)
i would've thought the local sending machine just wouldn't send it yet i see it in wireshark but as expected no reply from other end. surely the other end doesn't know how my machine calcs ISN's or cares?
please can anyone explain ?
thanks

RE: where is a packet with invalid tcp initial seq no discarded?

(OP)
SOLVED:
Rats! I was led astray by wireshark which didn't report a bad tcp header checksum. Once I [realized] and recalced the cecksum with the bad seq no. all was well.
This means that there is not an invalid ISN [initial sequence number].
Hmmm! I was about to add something startling that I found during my testing but there are too many people trying to be naughty on the internet so it's best left unsaid.

RE: where is a packet with invalid tcp initial seq no discarded?

(OP)
on the face of it i believe startling is the right word but it needs a bit more thought.

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