HP-UX IPv6 Transport Administrator's Guide for TOUR 2.0 (April 2004, rev 2)

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* Advanced Socket API features from RFC 2292bis, such as Routing Header, Hop-by-Hop,
and Destination Option processing are also supported. The inet6_rth_*() and
inet6_opt_*() functions provide these features. The inet6_rth_*() and
inet6_opt_*() functions are in /usr/lib/libipv6.1.