Den 17. aug. 2007 kl. 18.43 skrev Guy Harris:
Do those 4 bytes show up at the beginning, or the end, of the frame? For some frame types, we find either 4 bytes of FCS or 4 bytes of junk at the end of the frame.
They are at the end of each frame. Sometimes they have data and sometimes they are only zero's, so it may be junk.
Attached the first 220 bytes of a capture showing this. This frames contains LAPB with a Supervisory frame, which shall not contain any data.
-- Stig Bjørlykke
msg.cap.gz
Description: GNU Zip compressed data
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