docs: add Masquerade configuration page#751
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Documents persistent return-route setup on the destination host when masquerade is disabled on a routing peer. Covers Netplan, systemd-networkd, NetworkManager, ifupdown, and RHEL legacy network-scripts, plus verification and a security note. Resolves the previously dangling "Related" tile in how-routing-peers-work.mdx.
- Netplan: show as a fragment with addresses/default route context so readers don't paste it as a standalone file - systemd-networkd: note the drop-in needs a matching .network file and point at networkctl status to find it - Test section: add ping/curl reachability examples - Verify section: call out that proto/onlink/metric fields are normal - Remove NetworkManager, ifupdown, and RHEL legacy sections
Lead with the common case (cloud-init / installer yaml already exists), and call out the placeholders in the example. Add a fallback path for the rare case where /etc/netplan/ is empty.
Replace the weak one-liner with a bold "pick one" callout and a two-bullet decision criterion (ls /etc/netplan/) so readers don't mistake the two H3 sections for sequential steps.
Mirror the section already on the site-to-vpn page so readers learn to use their account's /16 block rather than pinning the whole /10. Same prose and netbird status recipe; trailing line adapted to reference 100.64.0.0/10 (the placeholder used elsewhere on this page).
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ping would fail for ACL reasons (not routing reasons) on policies scoped to specific TCP ports, misdirecting troubleshooting. Use curl or nc against an allowed port instead.
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Summary
/manage/networks/masqueradewith persistent return-route configuration for Netplan, systemd-networkd, NetworkManager, ifupdown, and RHEL legacy network-scripts.how-routing-peers-work.mdxthat pointed at a non-existentmasqueradepage.advanced-configuration.mdx→ "Without Masquerade" to the new page.