match_set_nw_proto(&match, ARP_OP_REPLY);
add_rule(ib, &match, IBR_TO_NEXT_HOP_ARP);
/* (e) Allow ARP requests from the next hop's MAC address. */
match_init_catchall(&match);
match_set_dl_type(&match, htons(ETH_TYPE_ARP));
match_set_nw_proto(&match, ARP_OP_REPLY);
add_rule(ib, &match, IBR_TO_NEXT_HOP_ARP);
/* (e) Allow ARP requests from the next hop's MAC address. */
match_init_catchall(&match);
match_set_dl_type(&match, htons(ETH_TYPE_ARP));