WAN Gateway Role assignment is only available on PingDirectory Servers version 3.5 or later. Legacy servers (i.e., pre-3.5) will never be selected as WAN Gateways. Updates from legacy replication servers are forwarded to all replication servers and not funneled to a single WAN Gateway. Also, updates from remote WAN Gateways will be forwarded to the legacy replication servers. Both of these actions will effectively increase WAN traffic during replication.