SIN_PROXY         711 netinet/if_ether.c 		la = arplookup(itaddr.s_addr, 0, SIN_PROXY);
SIN_PROXY         781 netinet/if_ether.c 	sin.sin_other = proxy ? SIN_PROXY : 0;
SIN_PROXY        1284 netinet/ip_input.c 	sin.sin_other = SIN_PROXY;