/usr/lib/libpacketdump/link_17.protocol is in libpacketdump3 3.0.21-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # PPP (RFC1661)
be8 hex "PPP: Address"
be8 hex "PPP: Control"
le16 hex "PPP: Type"
next "ppp" "PPP: Type"
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