added tailscale-router beszel secret

Reviewed-on: #72

.sops.yaml

@@ -77,6 +77,14 @@ creation_rules:
           - *admin
           - *lxc-tor-relay
 
+  - path_regex: secrets/tailscale-router\.yaml$
+    key_groups:
+      - age:
+          - *admin
+          - *linode-tailscale-router
+          - *lxc-tailscale-router
+          - *proxmox-tailscale-router
+
   # gui-host-specific secrets (currently: wifi-password, see
   # modules/networking/wifi.nix). Only *lxc-gui has a registered key today
   # -- proxmox-gui/linode-gui/baremetal-gui haven't been provisioned via

hosts/tailscale-router/host.nix

@@ -1,8 +1,19 @@
 _:
 
 {
+  imports = [
+    (import ../../modules/beszel/host-token.nix {
+      name = "tailscale-router";
+      sopsFile = ../../secrets/tailscale-router.yaml;
+    })
+  ];
+
   networking.hostName = "tailscale-router";
 
+  services.beszel.agent.environment = {
+    KEY = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPR9kwtC4TAeTRu46A7+opZsYpxqkRJ+x/ZyB2GWCeG";
+  };
+
   # No networking.hostId: only ZFS-touching hosts (server, docker) need one
   # for pool-import safety, and this host does neither.
 

modules/build-types/docker.nix

@@ -15,7 +15,6 @@
     ../docker/enable-service.nix
     ../docker/nextcloud-cron-job.nix
     ../docker/docker-health-to-gotify.nix
-    ../tailscale/enable-service.nix
     ../traefik/rotate-logs.nix
     ../raspi/mount-data.nix
     ../services/enable-rpcbind.nix

modules/build-types/tailscale-router.nix

@@ -1,8 +1,9 @@
-{ ... }:
+{ vars, ... }:
 
 {
   imports = [
     ../tailscale/subnet-router.nix
+    ../beszel/enable-agent.nix
   ];
 
   # "server", not "both": this build type advertises LAN subnet routes but
@@ -12,8 +13,31 @@
   # own setting) so the intent is clear at the build-type level.
   services.tailscale.useRoutingFeatures = "server";
 
-  # Forwarded subnet-router traffic arrives on tailscale0 already
-  # tailscale-authenticated -- the firewall's normal per-port allow-list
-  # would otherwise drop it. Standard NixOS/Tailscale subnet-router guidance.
-  networking.firewall.trustedInterfaces = [ "tailscale0" ];
+  # Advertise the LAN subnet so Tailscale peers can route back to LAN machines.
+  # Must also be approved in the Tailscale admin console (Machines → Edit route settings).
+  services.tailscale.extraUpFlags = [ "--advertise-routes=${vars.lanCidr}" ];
+
+  networking.firewall = {
+    # Forwarded subnet-router traffic arrives on tailscale0 already
+    # tailscale-authenticated -- the firewall's normal per-port allow-list
+    # would otherwise drop it. Standard NixOS/Tailscale subnet-router guidance.
+    trustedInterfaces = [ "tailscale0" ];
+
+    # SNAT LAN traffic going into Tailscale so the remote peer sees it as
+    # coming from this router's Tailscale IP rather than a raw LAN IP.
+    # Without this, Tailscale drops forwarded packets whose source is not a
+    # recognised Tailscale address.
+    #
+    # We target POSTROUTING directly (always-existing built-in chain) rather
+    # than nixos-nat-post: extraCommands runs after the old nixos-nat-post is
+    # deleted but before the new one is created, so -A nixos-nat-post silently
+    # fails.  The -C check makes the rule idempotent across firewall reloads.
+    extraCommands = ''
+      iptables -t nat -C POSTROUTING -s ${vars.lanCidr} -o tailscale0 -j MASQUERADE 2>/dev/null || \
+        iptables -t nat -A POSTROUTING -s ${vars.lanCidr} -o tailscale0 -j MASQUERADE
+    '';
+    extraStopCommands = ''
+      iptables -t nat -D POSTROUTING -s ${vars.lanCidr} -o tailscale0 -j MASQUERADE 2>/dev/null || true
+    '';
+  };
 }

modules/tailscale/subnet-router.nix

@@ -1,4 +1,4 @@
-_:
+{ pkgs, ... }:
 
 {
   imports = [ ./enable-service.nix ];
@@ -12,4 +12,24 @@ _:
     # instead of relaying through DERP.
     openFirewall = true;
   };
+
+  # Tailscale recommends these ethtool flags on the uplink interface to get
+  # full UDP GRO throughput on subnet routers (https://tailscale.com/s/ethtool-config-udp-gro).
+  # The interface is derived from the default route so it works regardless of
+  # what the NIC is named on a given host.
+  systemd.services.tailscale-udp-gro = {
+    description = "Enable UDP GRO forwarding on uplink for Tailscale subnet router";
+    after = [ "network-online.target" ];
+    wants = [ "network-online.target" ];
+    wantedBy = [ "multi-user.target" ];
+    path = [ pkgs.ethtool pkgs.iproute2 ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+      ExecStart = pkgs.writeShellScript "tailscale-udp-gro" ''
+        NETDEV=$(ip -o route get 8.8.8.8 | cut -f 5 -d " ")
+        ethtool -K "$NETDEV" rx-udp-gro-forwarding on rx-gro-list off
+      '';
+    };
+  };
 }

secrets/tailscale-router.yaml

@@ -0,0 +1,43 @@
+beszel-token: ENC[AES256_GCM,data:qg2eb7Eq/w7vIuiiDeK/s6h9nmHWuooyrd93GvdLD2hGOvka,iv:FWRBQTIY9PzV2V8J7z5ftEb5dvjN/S0hP0H9JV+Uuq8=,tag:WP7DHOu4elfqdLoW7vo9qg==,type:str]
+sops:
+    age:
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBCZmozK3VjcENGb3l2MDNj
+            QVE3VVI3Z3R0MjduSlJGL3BFWkg5NHZmZms0CkNBTWZKZFJVNkJMZ0tpNXhXWW5q
+            WndvbmhuOVh5ZHhJMmJwenh0M2dEVlUKLS0tIGpXQ3dhRXVWUDZzdGg4RHN4V3p0
+            WDZnK1lMUHVIS09hRUEzVHRHQ0EwcWsKEd5NtstHSPH8okXcFLW7BId5xPGmgyC3
+            dAodIGkLBlJlaL1bZuRy6Vaac+mJZL5KJYD/o1kYSXRiHJfNpaulTg==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1njap586hc0q43kr03g6c8eqhdsmk8zcafkl3f83xwlc2gqhlmfgs4tmwad
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBXWWhYOFU3VHZ3S1VuRTF2
+            QlZvMkJUNDZmT1RDWWZsMkxnZjJldjdrRG44CkU0NEJTR0NhQUpjMEY4RXBLSVBJ
+            bDNtZ1UrRDNUbzA0NDJ1cWJKdlBBMWMKLS0tIE9vTmEzTUxpODF4SG1MQ1czM1N5
+            dVgrMERMRXJwVmhtMldTZUlHNUJVTEkKzUf9cETbo0K9bCPkrlbUkgkhRIPvjCHR
+            GFVwgb2fcaOzZHcDwlLDLaP6HbRPtzJfVbLpQ1XU0N/xijSr9ENB6g==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1f7usptjx9rv4rxauasve200gxtdt9jkqhhdqstlf20wvlm7u75rsjfw50m
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBlOVdWN0tHNWZmaWlWQ2hJ
+            MVFYd0pMNmJTdTlJQ3h1c0dzbDE3U2VqdzNzCitCcFdhbjRPYnl3Q214WnRxa2Jq
+            eTFnc2VBcXlGcTVYdWpWTFZiWXBMUDAKLS0tIC9YdVkrTU5EeXNlNzliLzBlYUR2
+            Qk1ITW9tMElzUHF4MVJyWS9uRGs1QncKj8OgxWYabf8MccWD6zYLxl+FvYPAvLCW
+            p/FJ8uMa9YWp0RjICvWIwyO0gK7oaxTh/JzfBjABngEZnZazNYP7Uw==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1k7d2du5mejsmv5rzavm4xwgpthqvcfsehduquv28nzs53zppa3kqngfxq2
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBsbzFKckFQVDg0VEpJMFlv
+            WSs1ODVoYlZZK3YrSXlMU1hIQjdLTUhNdHhJCkRnbHY5Z2NGQVMvOHV4R2hTd0xu
+            LzdheXdZVVBsTjhVOU8zZGFKN0lPWjQKLS0tIFdaaG5SeElDN3YvMjFxdHVLWlNX
+            M1BQQmtJTUdsK2x5TEo5TmNrMEZidkEKhi4jNKhrkBAPhJoeYNg1d60LQTqmJt+G
+            Z/2X5uWzh12zF5keL8cNHH6sD0z0MOChtd4UF37yr+lb/LFJkia6LQ==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1zhfyuzlq40reuqlr34gf77852nhs3t6mqfzrqmas8z6sxk7tcfhsungrm0
+    lastmodified: "2026-07-26T01:12:11Z"
+    mac: ENC[AES256_GCM,data:0r68y6XmdiW7p/h9QmTR5h37TxKp+0wF44LP8QfG6cGP0tvaasuvv+V9EC3msnREYjwJhlnHjRd8hJ31HGVkOHbYWI4V5cF4ZnaiGgrZJhsGcJvOJSroAvQwev+vIlXZpAPgZz3Z35FDvOpgb71l5c0so0l4EJhc70JOh2FxhvQ=,iv:Or6l/v/E01+9wtZwyl+pCttiuReR6V0kmBzE9KhsfgQ=,tag:cAEUgj/9tKDToKFr00g5UQ==,type:str]
+    unencrypted_suffix: _unencrypted
+    version: 3.13.2