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Making DMZ isolated networks safe

My question concerns security around DMZ isolated networks. If the DMZ(s) are connected to a centralized storage device -- SAN or NAS -- what are the security implications? Would we be bridging the FW?
Based on the little information you have provided, yes, the NAS/SAN are in effect providing a bypass to the firewall. There are two aspects to consider here:

1. Separating the SANs between the one in DMZ and one in the backend network.

2. Improving security of the NAS/ SAN so it does not become the path of least resistance for attacks.

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