Smart snmpd port forward

Hello
I use smart-snmpd in openwrt
I can easily walk snmp on ip lan 192.168.1.1
But when I forward port 161 for my static isp ip, I can't walk the snmp
How should I solve this problem?

  • Can you show us the mentioned port forward?
  • How does smart-snmp differ from snmpd?

(Not a lot if details.)