Snmp and NAT

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http://www.unix.com – Hello, I am facing this scenario: three or more remote LAN (peripheral offices), with the same devices (printers, NAS) in each of them. Those LANs have the same network addresses, i.e.192.168.1.* (are connected to WAN via NAT). I need to collect snmp traps from a central server (public IP). Question: how can I distinguish traps sent from two devices in different remote locations? Suppose I receive a trap from printer HP2605 with IP I have two or more printers HP2605, same IP, in different remote offices. Which one has generated the trap? If you think, even for a si (HowTos)