S2S with router configuration

Hello,
I have not found here any information how to configure the below.
I would like to configure my ejaberd server to be available for all users in our WAN, and to connect with external servers (both Jabber, and these defined in transports) via second server located in DMZ. At the moment I have transports configured, but I would like to enable S2S connections. Can you help me with that, please.
This installation has to be security featured with transport server in DMZ and client server located in WAN.

Best regards
Tomaso

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