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The differences between SNAT and DNAT

Tino P

Dear Wizards, I'm a newbie to Sophos XG Firewall, can I ask the differences between SNAT and DNAT? In which case which method should we use?

For example: we have some Exchange mail servers, Web servers, ERP servers, SharedFile servers then we should use DNAT, am I right?

Many thanks in advance!



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    DNAT: Traffic from various IPs is being forwarded to a specific internal IP. Example: You want your internal Webserver to be available through the internet.  

    SNAT: Traffic from various IPs in a certain direction should only show a specific IP.  Example: You want to reach a network over VPN but the remote network should only see a specific IP so you're hiding the internal IPs behind the IP configured in SNAT.

    I hope that makes sense for you.

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    DNAT: Traffic from various IPs is being forwarded to a specific internal IP. Example: You want your internal Webserver to be available through the internet.  

    SNAT: Traffic from various IPs in a certain direction should only show a specific IP.  Example: You want to reach a network over VPN but the remote network should only see a specific IP so you're hiding the internal IPs behind the IP configured in SNAT.

    I hope that makes sense for you.

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