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Of course, it's possible to run more than one node per server. But if your server is low on resources (maybe a Pi) or you just want another server, it can be easily done. The concept is simple; because multiple servers behind a NAT router
appear to have one public IP address, each server will need it's IAX own port.
Instructions: [[Media:Two_ASL_servers_one_network.pdf|Two servers behind a NAT router]]