AZTCOFW / TECHNICAL GUIDE
Connecting OpenVPN Sites with Conflicting IP Subnets
One common use of NAT with OpenVPN is to mask conflicting LAN subnets between two locations. If two net- works are using the exact same subnet, or overlapping subnets, as their LAN or other internal network they cannot communicate across a site-to-site VPN without NAT.
Imported from the AZTCOFW knowledge base on 2026-09-05. Historical guidance may refer to older software versions. Confirm applicability before changing a production system.
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