feat(network): VLAN 11 link radius0 on the nodes, Cilium VLAN bypass

VLAN 11 "(11) RADIUS" carries the FreeRADIUS proxy traffic to the UDM
RADIUS, which accepts clients from its own networks only.

- Talos k8s-{1,2,3}: VLANConfig radius0 (VLAN 11 on uplink), link only,
  no addresses, IPv6 disabled (VLAN 11 sends RAs).
- Cilium bpf.vlanBypass [30, 11]: radius0 is address-less like ens19, so
  its tagged frames meet the VLAN filter on uplink (#592).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/radius/dot1x.md

@@ -94,6 +94,32 @@ The FreeRADIUS clients `test` (10.2.50.0/24) and `test6` (fd02:50::/64) and
 their CIDRs in `freeradius-cnp.yaml` are for the test phase only and must be
 removed after the test.
 
+## UniFi objects
+
+Created through the UniFi Network API (site `default`):
+
+| Object | ID | Settings |
+|---|---|---|
+| Firewall policy "Allow APs RADIUS" | `62c21e63-8c15-4720-adf8-b2333c090e2f` | zone Isolated `10.2.10.0/24` → zone External `10.2.99.91`, UDP `1812-1813`, ALLOW, IPv4 |
+| RADIUS profile "Cluster 802.1X" | `3e5fcfed-63dc-4e7d-ad51-17cbc074e4bb` | auth `10.2.99.91:1812`, acct `10.2.99.91:1813`, secret `DOT1X_NAS_SECRET`, VLAN assignment on (`vlan_wlan_mode: optional`) |
+| WLAN "Renner Test" | `3eba27e7-ddc2-41fb-ad3f-82add317847a` | copy of "Renner UniFi" (WPA2/WPA3 Enterprise transition, fast roaming, BSS transition, same AP group and bands), network (90) Guest as fallback, RADIUS profile "Cluster 802.1X" |
+
+## Live login check
+
+`tests/radius/live.sh` runs EAP-TTLS/PAP logins with `eapol_test` against the
+deployed FreeRADIUS from a test client range and prints result, duration and
+the VLAN attributes of the Access-Accept (hex) per login; secrets are read from
+files and never printed:
+
+```
+LIVE_PASSWORD_VAR=CLAUDE_BOT_PASSWORD tests/radius/live.sh 10.2.99.91 claude-bot \
+  ~/.config/claude-bot/authentik ~/.config/claude-bot/radius-secret 20
+```
+
+For IPv6 set `LIVE_SOURCE` to the workstation's `fd02:50::` address and use
+`fd99::91`. `group-id=[3530]` is VLAN `50`, `tunnel-type=[0000000d]` VLAN,
+`medium=[00000006]` IEEE-802.
+
 ## Client setup (SSID "Renner Test")
 
 All clients use EAP-TTLS with inner PAP. The server certificate is a public

kubernetes/infrastructure/cilium/helmrelease.yaml

@@ -95,19 +95,20 @@ spec:
       # VLAN-tagged frames, accounted as "VLAN traffic disallowed by VLAN
       # filter" in cilium_drop_count_total.
       #
-      # Only VLAN 30 (v30iot) needs listing. Cilium attaches to devices that
-      # carry an address, so it sees mgmt0's frames already untagged by the
-      # 8021q layer — nothing for a VLAN filter to match. ens19 is deliberately
-      # address-less, so its frames only meet the filter on the shared parent,
-      # still tagged. Adding 40 would change nothing and would touch the
-      # datapath carrying etcd and the API.
+      # Only the address-less macvlan parents need listing: VLAN 30 (ens19,
+      # v30iot) and VLAN 11 (radius0, freeradius-udm). Cilium attaches to
+      # devices that carry an address, so it sees mgmt0's frames already
+      # untagged by the 8021q layer — nothing for a VLAN filter to match.
+      # ens19 and radius0 are deliberately address-less, so their frames only
+      # meet the filter on the shared parent, still tagged. Adding 40 would
+      # change nothing and would touch the datapath carrying etcd and the API.
       #
       # The symptom when this is wrong is not a DHCP timeout: a tc-layer drop
       # reaches an AF_PACKET sender as ENOBUFS, so the CNI dhcp plugin reports
       # "no buffer space available" (#592).
       #
       # Same three-copy problem as policyMapMax above. Takes an agent restart.
-      vlanBypass: [30]
+      vlanBypass: [30, 11]
       # Let pods reach the cluster's own LoadBalancer external IPs; Cilium
       # redirects the socket directly to the backend pod instead of sending
       # traffic out to the VIP and back (which fails with L2 announcements).

kubernetes/talos/patches/k8s-1.yaml

@@ -8,6 +8,10 @@ machine:
     # 10.2.30.0/24 route makes node replies bypass the UDM and breaks every
     # DNATed flow.
     net.ipv6.conf.ens19.disable_ipv6: "1"
+    # radius0 (VLAN 11) is LINK ONLY as well: the macvlan parent for the
+    # FreeRADIUS attachment. VLAN 11 announces RAs; the node must not
+    # autoconfigure from them.
+    net.ipv6.conf.radius0.disable_ipv6: "1"
     # These two sit on the untagged fallback network, where nothing may run.
     # Left enabled they autoconfigure a ULA and an IPv6 default route from its
     # RAs, which ties with mgmt0's and costs the cluster IPv6 egress.
@@ -168,6 +172,17 @@ vlanID: 30
 parent: uplink
 up: true
 ---
+# VLAN 11, UniFi "(11) RADIUS": link only, no addresses, no DHCP. Macvlan
+# parent of the freeradius-udm attachment
+# (kubernetes/apps/authentik/freeradius-network-attachment.yaml), which names
+# it as `master`; renaming this link means editing that too.
+apiVersion: v1alpha1
+kind: VLANConfig
+name: radius0
+vlanID: 11
+parent: uplink
+up: true
+---
 # Pod network, VLAN 48. Node-to-node only: the VXLAN overlay rides it once the
 # kubelet node IP moves here, and nothing on it is routed off the switch.
 #

kubernetes/talos/patches/k8s-2.yaml

@@ -7,6 +7,8 @@ machine:
     # macvlan parent for the v30iot pod attachments; host addresses on that L2
     # make node replies bypass the UDM and break every UDM-DNATed flow.
     net.ipv6.conf.ens19.disable_ipv6: "1"
+    # radius0 (VLAN 11): link only — see k8s-1.yaml.
+    net.ipv6.conf.radius0.disable_ipv6: "1"
     # Same for the physical ports on the untagged fallback network: left
     # enabled they take an IPv6 default route from its RAs and cost the
     # cluster IPv6 egress.
@@ -115,6 +117,14 @@ vlanID: 30
 parent: uplink
 up: true
 ---
+# VLAN 11, "(11) RADIUS": link only, no host addressing — see k8s-1.yaml.
+apiVersion: v1alpha1
+kind: VLANConfig
+name: radius0
+vlanID: 11
+parent: uplink
+up: true
+---
 # Pod network, VLAN 48. Node-to-node only, statically addressed, no gateway
 # and no DHCP — see k8s-1.yaml.
 apiVersion: v1alpha1

kubernetes/talos/patches/k8s-3.yaml

@@ -4,6 +4,8 @@ machine:
   sysctls:
     # v30iot NIC carries no host addressing — see k8s-1.yaml.
     net.ipv6.conf.ens19.disable_ipv6: "1"
+    # radius0 (VLAN 11): link only — see k8s-1.yaml.
+    net.ipv6.conf.radius0.disable_ipv6: "1"
     # Same for the physical ports on the untagged fallback network — see
     # k8s-1.yaml.
     net.ipv6.conf.uplink.disable_ipv6: "1"
@@ -102,6 +104,14 @@ vlanID: 30
 parent: uplink
 up: true
 ---
+# VLAN 11, "(11) RADIUS": link only, no host addressing — see k8s-1.yaml.
+apiVersion: v1alpha1
+kind: VLANConfig
+name: radius0
+vlanID: 11
+parent: uplink
+up: true
+---
 # Pod network, VLAN 48. Node-to-node only, statically addressed, no gateway
 # and no DHCP — see k8s-1.yaml.
 apiVersion: v1alpha1

tests/radius/README.md

@@ -43,3 +43,6 @@ Pieces:
 Requires Docker, `openssl` and `yq` (the jq wrapper). Secrets, password and
 certificates are generated dummies. `RADTEST_DEBUG=1` runs radiusd with `-xx`
 and prints all logs. Containers, network and temp files are removed on exit.
+
+`live.sh` logs in against the deployed FreeRADIUS instead; usage in
+`docs/radius/dot1x.md` ("Live login check").

tests/radius/live.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# Live EAP-TTLS/PAP login against the deployed FreeRADIUS from a test client
+# (10.2.50.0/24 / fd02:50::/64, client "test"/"test6").
+#
+# Usage: tests/radius/live.sh <server-ip> <identity> <password-file> <secret-file> [count]
+#   password-file: the password on the first line, or `export NAME=value` lines
+#                  (LIVE_PASSWORD_VAR selects the variable, default CLAUDE_BOT_TOKEN)
+#   secret-file:   `bao kv get` output of apps/radius, or the bare
+#                  DOT1X_TEST_SECRET on the first line
+#   count:         number of logins (default 1)
+#   LIVE_SOURCE:   optional local address for eapol_test -A (must be in a
+#                  test client range)
+# Prints one line per login: result, duration, VLAN. Secrets are never printed.
+set -euo pipefail
+
+server="$1"
+identity="$2"
+password_file="$3"
+secret_file="$4"
+count="${5:-1}"
+password_var="${LIVE_PASSWORD_VAR:-CLAUDE_BOT_TOKEN}"
+
+read_password() {
+  local line
+  line=$(grep -m1 -E "^export ${password_var}=" "$password_file" || true)
+  if [ -n "$line" ]; then
+    line="${line#*=}"
+    line="${line#\"}"; line="${line%\"}"
+    line="${line#\'}"; line="${line%\'}"
+    printf '%s' "$line"
+  else
+    head -n1 "$password_file"
+  fi
+}
+
+read_secret() {
+  local s
+  s=$(sed -n 's/.*DOT1X_TEST_SECRET:\([^] ]*\).*/\1/p' "$secret_file")
+  if [ -n "$s" ]; then printf '%s' "$s"; else head -n1 "$secret_file"; fi
+}
+
+work=$(mktemp -d)
+trap 'rm -rf "$work"' EXIT
+chmod 700 "$work"
+
+password=$(read_password)
+secret=$(read_secret)
+[ -n "$password" ] || { echo "no password found in $password_file" >&2; exit 2; }
+[ -n "$secret" ] || { echo "no DOT1X_TEST_SECRET found in $secret_file" >&2; exit 2; }
+
+umask 077
+cat > "$work/eapol.conf" <<EOF
+network={
+	ssid="Renner Test"
+	key_mgmt=WPA-EAP
+	eap=TTLS
+	identity="${identity}"
+	anonymous_identity="anonymous"
+	ca_cert="/etc/ssl/certs/ca-certificates.crt"
+	domain_suffix_match="radius.renner.uno"
+	phase2="auth=PAP"
+	password="${password}"
+}
+EOF
+
+for i in $(seq 1 "$count"); do
+  start=$(date +%s%N)
+  out=$(eapol_test -c "$work/eapol.conf" -a "$server" ${LIVE_SOURCE:+-A "$LIVE_SOURCE"} -s "$secret" -t 10 2>&1 || true)
+  end=$(date +%s%N)
+  ms=$(( (end - start) / 1000000 ))
+  result=$(tail -n1 <<<"$out")
+  case "$result" in SUCCESS|FAILURE) ;; *) result="NO-RESULT" ;; esac
+  # Attribute lines of the Access-Accept as the NAS received it (hex values).
+  attrs=$(awk '/RADIUS message: code=2 /{f=1; next} f && /^   /{print; next} f{f=0}' <<<"$out")
+  attr() { awk -v a="Attribute $1 " 'index($0, a){getline; sub(/^ *Value: /, ""); print; exit}' <<<"$attrs"; }
+  echo "login $i: $result ${ms}ms tunnel-type=[$(attr 64)] medium=[$(attr 65)] group-id=[$(attr 81)]"
+done