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articles/payment-hsm/inspect-traffic.md

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@@ -36,7 +36,7 @@ This design is inspired by the [Dedicated HSM solution architecture](../dedicate
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The firewall **SNATs the client IP address** before forwarding traffic to the PHSM NIC, guaranteeing that the return traffic will automatically be directed back to the Firewall. Either an Azure Firewall or a 3rd party FW NVA can be used in this design.
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:::image type="content" source="./media/firewall-snat-architecture-diagram.png" alt-text="Architecture diagram of the firewall with SNAT":::
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:::image type="content" source="./media/firewall-snat-architecture-diagram.png" alt-text="Architecture diagram of the firewall with SNAT" lightbox="./media/firewall-snat-architecture-diagram.png":::
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Route tables required:
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- On-Prem to PHSM: a Route Table containing a UDR for the Payment HSM VNet range and pointing to the central hub Firewall is applied to the GatewaySubnet.
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This architecture leverages a reverse proxy, deployed in a dedicated subnet in the PHSM VNet directly or in a peered VNet. Instead of sending traffic to the PHSM devices, the destination is set to the reverse proxy IP, located in a subnet that does not have the restrictions of the PHSM delegated subnet: both NSGs and UDRs can be configured, and combined with a Firewall in the central hub.
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:::image type="content" source="./media/firewall-reverse-proxy-architecture-diagram.png" alt-text="Architecture diagram of the firewall with reverse proxy":::
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:::image type="content" source="./media/firewall-reverse-proxy-architecture-diagram.png" alt-text="Architecture diagram of the firewall with reverse proxy" lightbox="./media/firewall-reverse-proxy-architecture-diagram.png":::
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This solution requires a reverse proxy, such as:
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