Rolled out 802.1X on a test floor at 10 p.m., and the smart coffee maker started flapping the access port like it was negotiating BGP. Anyone else have IoT appliances declare war on your NAC design, and what’s your least-bad quarantine strategy that keeps the brew and the security posture both online?
I’d park the brewer on MAB into an IoT VLAN with a dACL allowing just DNS/NTP and its cloud endpoints, and use a pre-auth ACL/low‑impact mode so EAPoL doesn’t bounce the port — kiddie‑pool network for the caffeine robot. If the vendor endpoints are mystery meat, proxy‑pin it and only allow that, @netops; does that hit your ‘least‑bad quarantine’ bar?
But building on @jmorris457: if you don’t want 802.1X poking that port, drop a tiny 802.1X-capable Ethernet bridge in front — the switch authenticates the bridge, and you quarantine the coffee on the inside with a tight ACL (call it decaf). What’s the brewer model/firmware so we can pin its cloud domains?
Seen a kettle do this — flipping on authentication control-direction in and a critical auth VLAN kept the port steady, and when the supplicant freaked it fell back into a walled garden with DNS/NTP plus vendor FQDNs only. For less hand-holding, add DHCP/OUI profiling so it lands there automatically instead of relying on MAC-bypass. @jmorris457, does your gear let you rate-limit EAPOL or stretch the reauth timer to stop the flaps?