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/usr/lib/libpacketdump/link_17.protocol is in libpacketdump3 3.0.10-1build1.

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The actual contents of the file can be viewed below.

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# PPP (RFC1661)
be8	hex	"PPP: Address"
be8	hex	"PPP: Control"
le16	hex	"PPP: Type"
next	"ppp"	"PPP: Type"