RTV_EXPIRE
rtm->rtm_inits = RTV_EXPIRE;
caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
setmetric(RTV_EXPIRE, rmx_expire);
rtm->rtm_inits = RTV_EXPIRE;
rtm->rtm_inits = RTV_EXPIRE;
arpmsg.hdr.rtm_inits = RTV_EXPIRE;
rt->rtm_inits = RTV_EXPIRE;