SNMP_PORT 170 net/ipv4/netfilter/nf_nat_snmp_basic_main.c if (udph->source == htons(SNMP_PORT) && dir != IP_CT_DIR_REPLY) SNMP_PORT 56 net/netfilter/nf_conntrack_snmp.c .tuple.src.u.udp.port = cpu_to_be16(SNMP_PORT),