SNMP_TRAP_PORT 1254 net/ipv4/netfilter/nf_nat_snmp_basic.c if (udph->dest == htons(SNMP_TRAP_PORT) && dir != IP_CT_DIR_ORIGINAL) SNMP_TRAP_PORT 1305 net/ipv4/netfilter/nf_nat_snmp_basic.c .tuple.src.u.udp.port = __constant_htons(SNMP_TRAP_PORT),