1) Add new node without IP (or set it to 0.0.0.0), set correct SNMP port
2) Open node properties -> communications, set "Primary host name" to external IP and select checkbox "This is address of remote management node"
3) Do full configuration poll
2) Open node properties -> communications, set "Primary host name" to external IP and select checkbox "This is address of remote management node"
3) Do full configuration poll