diff --git a/bastion/src/modules/modules/k3s/src/operations/cilium.ts b/bastion/src/modules/modules/k3s/src/operations/cilium.ts
index 6c319cb..7ac05ff 100644
--- a/bastion/src/modules/modules/k3s/src/operations/cilium.ts
+++ b/bastion/src/modules/modules/k3s/src/operations/cilium.ts
@@ -38,12 +38,20 @@ export const installCilium: Operation = async (ctx): Promise<OperationResult> =>
   // Install Cilium
   // - No hardcoded devices: Cilium auto-detects per node (heterogeneous NICs like eno1 vs enP7s7)
   // - k8sServiceHost/Port: k3s agents proxy the API on 127.0.0.1:6444 (not 6443)
+  // - cni.exclusive=false: required so Multus can install its CNI config alongside
+  //   Cilium (Cilium otherwise deletes any non-Cilium CNI conf).
+  // - bpf.vlanBypass={10}: allow VLAN 10 (LoT) tagged traffic through the eBPF
+  //   host VLAN filter, so pods on a macvlan/VLAN-10 interface receive multicast
+  //   (Matter/mDNS ff02::fb + 224.0.0.251). Without this Cilium drops it
+  //   ("VLAN traffic disallowed by VLAN filter", bpf_host.c).
   const installResult = await ctx.ssh.exec(
     `KUBECONFIG=/etc/rancher/k3s/k3s.yaml cilium install \
       --set kubeProxyReplacement=true \
       --set ipam.mode=kubernetes \
       --set k8sServiceHost=127.0.0.1 \
-      --set k8sServicePort=6444`,
+      --set k8sServicePort=6444 \
+      --set cni.exclusive=false \
+      --set bpf.vlanBypass="{10}"`,
     { timeoutMs: 300_000 },
   );
   if (installResult.exitCode !== 0) {