SIN_PROXY
rt = arplookup(&itaddr, 0, SIN_PROXY, rdomain);
sin.sin_other = proxy ? SIN_PROXY : 0;
rt = arplookup(&in, 0, SIN_PROXY, rtableid);
doing_proxy = SIN_PROXY;
if (sin_m.sin_other & SIN_PROXY) {
sin_m.sin_other = SIN_PROXY;
if (sin_m.sin_other & SIN_PROXY) {
sin_m.sin_other = SIN_PROXY;
sin_m.sin_other = SIN_PROXY;
arpmsg.dst.sin_other = SIN_PROXY;
if (sin_m.sin_other & SIN_PROXY) {
sin_m.sin_other = SIN_PROXY;
sin_m.sin_other = SIN_PROXY;