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docs(networking): document tailscale-to-sandbox source NAT on gw01 #27

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jmgilman merged 1 commit into from
Aug 26, 2026
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docs(networking): document tailscale-to-sandbox source NAT on gw01 #27

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10 changes: 7 additions & 3 deletions docs/docs/reference/networking/address-plan.md
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Expand Up @@ -25,9 +25,13 @@ remains the source for network values.
| Home | `192.168.2.0/24` | `rtr01` | Additional home network advertised through Tailscale |

`gw01` uses `10.0.0.1` as its default route. `rtr01` routes `10.10.0.0/16`
through `10.0.0.2`. `gw01` applies source NAT only when lab traffic exits
toward the internet. Home-to-lab and inter-VLAN traffic retain their source
addresses.
through `10.0.0.2`. `gw01` applies source NAT in exactly two cases: lab
traffic exiting toward the internet, and Tailscale clients
(`100.64.0.0/10`) entering the sandbox/workload VLAN. The sandbox
masquerade keeps replies from tailnet-member hosts such as `sandbox01`
symmetric through `gw01` instead of leaking into the host's own tailscale
peer routes. All other home-to-lab, Tailscale-to-lab, and inter-VLAN
traffic retains its source addresses.

## VLANs

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