Reusable cnx.router.* module for the Topton 1U boxes replacing OPNsense:
PPPoE WAN (optionally VLAN-tagged, AIS: 10, secret credentials incl.
username), VLAN-filtering bridge, nftables NAT/firewall with MSS clamp,
Kea DHCP with per-VLAN lease time, Blocky DNS, DHCPv6-PD, CrowdSec with
the ZeroTier mesh whitelisted, optional Omada controller, ZFS disk.
Fleet baseline rides along: admins sops group is now derived for every
machine in clan.nix (secrets encrypt to it from the first vars generate)
and time sync is chrony everywhere instead of systemd-timesyncd.
Pure formatting (nixfmt/prettier/yamlfmt); no behavior change. These
files predate the current treefmt config and were failing nix flake
check; reformatting them makes the gate green again.
mx1 runs Simple NixOS Mailserver (Postfix/Dovecot/Rspamd/OpenDKIM) for
cnx.email. The TLS cert is obtained via ACME DNS-01 using a dedicated,
scoped TSIG key (acme_mx1) that ns1 authorizes for only
_acme-challenge.mx1 and _acme-challenge.mta-sts on the cnx.email zone, so
the credential can write nothing else. Mailbox passwords are auto-minted
by a clan vars generator (four-word passphrase + number).
DANE TLSA (3 1 1) is published for _25._tcp.mx1; --reuse-key keeps the
key digest stable across renewals. MTA-STS is enforced via a Caddy vhost
serving the policy on :443 from the same cert (mta-sts SAN). Firewall
opens 25/587/465/143/993/443; 80 stays closed.
- Register mx1 in the inventory and as a direct-SSH `internet` host; give it
a static public IPv6 (2a01:4ff:2f0:1963::1).
- Point the cnx.email MX (plus SPF/DMARC) at mx1 and add its A record.
- Bring mx1 into monitoring: import exporters, add it to the mesh map and the
node scrape job so its host metrics and journald reach control.
- Add a clan-mx1 Hetzner firewall: inbound SMTP + ZeroTier + ICMP, no public
SSH (admin rides the mesh like the other hosts). 587/465/993 held for now.
- Extract per-host public IPv4/IPv6 into modules/hosts.nix, consumed by
clan.nix's internet hosts and each machine's cnx.staticIPv6, so each address
is declared once instead of being duplicated across configs.
- docs: add mx1 to the machines table.
kurogeek
Berwn