ND_NA_FLAG_SOLICITED
(i_am_router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
flags &= ~ND_NA_FLAG_SOLICITED;
(ND_NA_FLAG_ROUTER|ND_NA_FLAG_SOLICITED|ND_NA_FLAG_OVERRIDE)
if (flags & ND_NA_FLAG_SOLICITED)