Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations TouchToneTommy on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

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

Status
Not open for further replies.

turnbui

Programmer
Jul 23, 2005
60
GB
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
 
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.
 
on the face of it i believe startling is the right word but it needs a bit more thought.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top