HI. I need some helps with port forwarding. I have a SNMP agent listen on port 1610 (not 161 for rights restriction). External applications send query to 161 port and wait response from this port. Here's my configuration: eth0: 192.168.0.1 eth0:0 192.168.0.2 iptables -t nat -I PREROUTING -p udp -d 192.168.0.2 --dport 161 -j DNAT --to-destination 192.168.0.1:1610 iptables -t nat -I POSTROUTING -p udp -s 192.168.0.1 --sport 1611 -j SNAT --to-source 192.168.0.2:161 When I query agent on 192.168.0.1:1610, I receive correct response from 192.168.0.2:161. But, when I query agent on 192.168.0.2:161, agent log an error: IOException: Operation not permitted. If anybody can help me it would be appreciated. Thank you !
