[ns] MAC traces -HELP!!

[Spyros Marinis]

Hi everybody!!
Could someone explain to me what the fields in mac traces mean?? I get something like:
s 0.525103445 _2_ MAC  --- 12 sctp 1558 [13a 2 0 800] ------- [0:0 4194305:0 29 4194305] [1 D 2 0 1] 0 0
r 0.531431714 _4_ MAC  --- 12 sctp 1500 [13a 2 0 800] ------- [0:0 4194305:0 29 4194305] [1 D 2 0 1] 1 0
I think I understand some of these, but if column 7 is bytes of the packet, why does it send 1558 bytes, when the original packet had only 1500, as much it is correctly received afterwards???? Are these 58 additional bytes some kind of header? And if yes, why aren't they counted when packet is received?
I also cannot understand what the AGT packets are, like these:
r 0.575538683 _4_ AGT  --- 19 sctp 1500 [13a 2 0 800] ------- [0:0 4194305:0 29 4194305] [1 D 7 0 6] 1 0
Any help will be appreciated. Thanks in advance,
Spyros




      
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