Ok, case can be closed. :) It is really not set in any further packets and taken from last S/A packet. I amnaged to get what I want, so question is not valid. For the ones who want set Window scale - option 3 shall be used in any packet with S flag. Below example is scaling factor 4, right window size still shall be set with set command.

$packet->optset(tcp=> { type => [(3)], data => [("\x04",)],});

I appreciate all provided comments about the case and thanks to the ones who answered

Martynas

In reply to Re^7: Scaled TCP window with Net::RawIP by Martynas
in thread Scaled TCP window with Net::RawIP by Martynas

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