ic_proto_used
if (ic_proto_used & IC_PROTO)
(ic_proto_used & IC_RARP) ? "RARP"
: (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
static int ic_proto_used; /* Protocol used, if any */
ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);