[ndnSIM] length of interest packet

[5 project]

Hi!

I am checking the packet in the pcap file.
Why is there some lengths in interest packets?
For example,
1. time: 9e-05 Length:75 Source:01
08800000ffffffffffff000000000001000000000
0010000aaaa030000007777642554010055010050
1d051b070f08067072656669780801350802fe000
a04f2b1c10d0c0207d000000000

3. time: 0.003853 Length:84 Source:12
08800000ffffffffffff000000000012000000000
0121000aaaa030000007777642e540100550111fd
032005fd03210196501d051b070f0806707265666
9780801350802fe000a04f2b1c10d0c0207d00000
0000

I'm experimenting in a wireless environment.

Thanks!
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