bittorrent/libutp — Issue #33: uTP
Author: sangeetaC
Created: 2012-01-27 07:16:58+00:00
State: open

I captured uTP traffic through wireshark and saw

data part of UDP, either it starts with -

01 00 e2 18 7f 64 .Lv.x1.K .......d
0030 6a e0 56 9d 87 84 00 38 00 00 38 cd 31 45 4b df j.V....8 ..8.1EK.
0040 45 94 54 af f0 57 89 a6 e3 f4 3f 9d 0b 6d 3f 5b E.T..W.. ..?..m?[
0050 d0 7d 90 99 db 45 4c 34 72 4a d5 c9 03 08 57 c3 .}...EL4 rJ....W.
0060 8d 93 84 d0 62 77 87 29 1b ba ef 10 6c ....bw.) ....l

or

21 00 42 ff 7f 55 .Lv.x1.. ..!.B..U
0030 c0 e1 56 9d 85 1d 00 38 00 00 33 46 f0 98 ..V....8 ..3F..

Now,

According to the uTP draft, version is of 4 bits but here its says 01 that is 1 byte.

Most of the packets starts with 01.But what are those packets which not start with 01?