Hi, In one of our projects we are using two products with two different SNMP stacks (one in C and other in Java) on the same Linux box. C SNMP stack is used to listen for traps from some old generation devices and Java SNMP stack is used to listen for traps from new generation devices. Is it possible to configure iptables to copy (duplicate) packets coming in to UDP port 162 to another port (say 1620) on the same box? In otherwords, both 162 and 1620 should receive all the SNMP traps coming in to the system. If I use REDIRECT target, I will be able to receive traps only on the redirected port, but not on 162. I also tried to forward port 162 to two diffetent ports (one for C and other for Java SNMP) as follows. In this case packets are getting forwarded to only one port (1620). iptables -t nat -A PREROUTING -p udp --dport 162 -j REDIRECT --to-ports 1620-1621 BTW, I looked at the ROUTE target in netfilter site. However, we may not be able to install kernel patches in customer environments (they may not allow it). Thanks in advance, Rama
