Solving Network Subnet Conflicts with WireGuard and NAT Overlay Addressing
By
pcarroll
The bagel they save for the regulars. Don't skim, savour.
Summary
This technical article addresses the common problem of conflicting IP subnets in network deployments, particularly for professionals managing devices across multiple customer sites. It explains how default router configurations (like 192.168.1.0/24) create subnet conflicts when connecting different networks. The article presents solutions using WireGuard VPN and 1:1 NAT to create overlay networks that resolve these conflicts, enabling seamless connectivity between devices on overlapping subnets. The content is targeted at IT professionals, security integrators, MSPs, and AV installers who deploy equipment at residential or commercial sites.
Key quotes
· 4 pulledEvery consumer router and ISP modem ships with the same default subnet. The specific range varies by manufacturer (192.168.1.0/24, 192.168.0.0/24, 10.0.0.0/24), but the result is the same: every site ends up on one of the same few subnets.
Security integrators, MSPs, AV installers, home automation companies. Anyone who deploys equipment at residential sites encounters this immediately.
The NVR at one customer site can't talk to the NVR at another site because they're both on 192.168.1.0/24.
Solving the conflicting subnet problem with overlay addressing, WireGuard, and 1:1 NAT.
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