0000: FF 03 C0 21 |01 00 00 11 |01 04 05 C8 ,05
06 13 7F
LCP Configure-Request ID len MRU len 1480 Magic Number
len
len
0010: 21 1B ,0D 03 06
^^^^^^^^????

what does "OD" mean?
in RFC 1661, i can only find types from 1 to 8.