rtpref
ra->nd_ra_flags_reserved |= ra_options_conf->rtpref;
ra_options->rtpref = ND_RA_FLAG_RTPREF_HIGH;
ra_options->rtpref = ND_RA_FLAG_RTPREF_MEDIUM;
ra_options->rtpref = ND_RA_FLAG_RTPREF_LOW;
const char* rtpref(int);
rtpref(int rtpref)
switch (rtpref & ND_RA_FLAG_RTPREF_MASK) {
printf("%srouter preference %s\n", indent, rtpref(ra_options->rtpref));
int rtpref; /* router preference */