▁( B GP - SR x ) ▁or ▁a ▁R PK I ▁implementation ▁fully ▁R FC - comp li ant ▁based ▁on ▁R TR lib . ▁The ▁R TR lib ▁provides ▁an ▁open ▁source ▁C ▁implementation ▁of ▁the ▁R TR ▁protocol ▁and ▁prefix ▁origin ▁ver ification . ▁The ▁library ▁is ▁useful ▁for ▁developers ▁of ▁routing ▁software ▁but ▁also ▁for ▁network ▁operators . ▁Develop ers ▁can ▁integrate ▁the ▁R TR lib ▁into ▁the ▁B GP ▁da emon ▁to ▁extend ▁their ▁implementation ▁towards ▁R PK I . ▁Network ▁operators ▁may ▁use ▁the ▁R TR lib ▁to ▁develop ▁monitoring ▁tools ▁( e . g ., ▁to ▁check ▁the ▁proper ▁operation ▁of ▁c aches ▁or ▁to ▁evaluate ▁their ▁performance ). ▁ ▁R FC ▁ 6 4 9 4 ▁updates ▁the ▁certificate ▁validation ▁method ▁of ▁the ▁Sec ure ▁Ne igh bor ▁Disc overy ▁protocol ▁( S END ) ▁security ▁mechan isms ▁for ▁Ne igh bor ▁Disc overy ▁Pro tocol ▁( ND ) ▁to ▁use ▁R PK I ▁for ▁use ▁in ▁IP v 6 . ▁It ▁defines ▁a ▁S END ▁certificate ▁profile ▁util izing ▁a ▁modified ▁R FC ▁ 6 4 8 7 ▁R PK I ▁certificate ▁profile ▁which ▁must ▁include ▁a ▁single ▁R FC ▁ 3 7 7 9 ▁IP ▁address ▁deleg ation ▁extension . ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Tool ▁provided ▁by ▁Cl ou dflare ▁to ▁test ▁if ▁I SP ▁is ▁doing ▁R PK I ▁validation ▁ ▁Tool ▁by ▁Cl ou dflare ▁to ▁explore ▁R PK I ▁ ▁Open ▁source ▁R PK I ▁Document ation ▁