Openhab floods network with mdns

Euphi · May 31, 2025, 10:26am

Platform information:
- Hardware: Opi5 Ultra
- OS: dietPI
- Java Runtime Environment: openjdk 17.0.15
- openHAB version: 4.3.5
Issue of the topic: openhab floods network with mdns queries

I setup a new SBC as homeserver. While everything was workinjg fine in the beginning, I noticed that suddenly network (wifi) became unreliable and that openhab used too much CPU (around 150% minimum).

Stopping openhab makes network reliable again.

I then used tcpdump to look whats going on in the network and saw that when openhab runs there is a flood of mDNS messages:

Short example (note the timestamps that this is a window of 17ms only):

11:55:15.000646 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.001010 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.001580 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.001736 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.002694 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.002712 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.003000 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.003159 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.003359 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.003575 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.003745 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.003955 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.004609 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.004810 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.004960 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.006200 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.006216 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.006255 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.006290 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.007396 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.007443 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.008553 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.009328 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.009381 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.009431 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.009775 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.010674 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.010994 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.011104 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.011202 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.011352 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.011982 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.012142 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.014385 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.014552 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.015657 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.015809 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.015879 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.016042 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.016195 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.016360 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.016416 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.016525 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.016608 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.016690 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86)
11:55:15.016767 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.016933 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.017067 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)
11:55:15.017082 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55)
11:55:15.017201 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36)

Before this happened I installed the Matter addon and tried to add a Tasmota device with Matter turned on. (which failed, so I deactivated the matter addon and removed it - which was NOT successfull immediately. After reboot, it was still there and then I was able to remove it).

I have no idea what this C049EF8DABD0.local device is - however, openhab queries it immediately and nonstop after restart or reboot.

As a quick fix, I stopped two of the bundles related to mDNS:

openhab> bundle:list | grep -i mdns
 58 │ Active   │  80 │ 3.5.12                │ JmDNS
172 │ Waiting  │  80 │ 4.3.5                 │ openHAB Core :: Bundles :: Configuration mDNS Discovery
187 │ Resolved │  80 │ 4.3.5                 │ openHAB Core :: Bundles :: REST mDNS Announcer
194 │ Resolved │  80 │ 4.3.5                 │ openHAB Core :: Bundles :: mDNS Service
258 │ Waiting  │  80 │ 4.3.5                 │ openHAB Core :: Bundles :: Configuration USB-Serial Discovery using ser2net mDNS scanning
265 │ Waiting  │  80 │ 4.3.5                 │ openHAB Core :: Bundles :: mDNS Suggested Add-on Finder

How can I come to a clean solution (= all bundles are active and openhab no longer floods my network)?

Euphi · May 31, 2025, 10:38am

github.com/openhab/openhab-core

Openhab floods network with mdns

opened 10:38AM - 31 May 25 UTC

euphi

bug

* Platform information: * Hardware: Opi5 Ultra * OS: dietPI * Java Runtime… Environment: openjdk 17.0.15 * openHAB version: 4.3.5 * Issue of the topic: openhab floods network with mdns queries ## Expected Behavior openhab behaves well and does not flood my network ## Current Behavior openhab spams so much mdns queries that it kicks out wifi clients. ## Steps to Reproduce (for Bugs) 1. I setup a new SBC as homeserver. Everything was workinjg fine in the beginning 2. Configuring openhab (adding bindings/things etc.). Some already work fine. 3. Adding matter add-on, create Matter controller thing and unsuccessfully tried to add a matter node (tasmota with matter activated) --> I noticed that suddenly network (wifi) became unreliable and that openhab used too much CPU (around 150% minimum).Stopping openhab makes network reliable again. 4. I removed the matter related things and the addon. 5. Several Restart of openhab and several reboots of the whole system --> network is still flooded. **Note: I removed matter add-on and related things. It may be a coincidence that the problem started at the same time. However, if I stop openhab or stop the mdns bundles, the network is not flooded. So openhab is definitely the culprit here.** tcpdump with short example (note the timestamps that this is a window of 17ms only): ``` 11:55:15.000646 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.001010 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.001580 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.001736 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.002694 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.002712 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.003000 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.003159 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.003359 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.003575 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.003745 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.003955 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.004609 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.004810 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.004960 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.006200 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.006216 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.006255 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.006290 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.007396 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.007443 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.008553 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.009328 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.009381 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.009431 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.009775 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.010674 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.010994 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.011104 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.011202 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.011352 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.011982 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.012142 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.014385 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.014552 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.015657 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.015809 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.015879 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.016042 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.016195 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.016360 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.016416 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.016525 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.016608 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.016690 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d:0:7887:a8ff:fe02:feb8 (86) 11:55:15.016767 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.016933 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.017067 IP 192.168.0.242.mdns > mdns.mcast.net.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) 11:55:15.017082 IP6 fe80::7887:a8ff:fe02:feb8.mdns > ff02::fb.mdns: 0*- [0q] 1/0/0 (Cache flush) AAAA fd7a:d212:312d::ffe5 (55) 11:55:15.017201 IP6 fe80::820c:f9ff:fec8:c271.mdns > ff02::fb.mdns: 0 AAAA (QM)? C049EF8DABD0.local. (36) ``` ## Ugly workaround: As a quick fix, I stopped two of the bundles related to mDNS: ``` openhab> bundle:list | grep -i mdns 58 │ Active │ 80 │ 3.5.12 │ JmDNS 172 │ Waiting │ 80 │ 4.3.5 │ openHAB Core :: Bundles :: Configuration mDNS Discovery 187 │ Resolved │ 80 │ 4.3.5 │ openHAB Core :: Bundles :: REST mDNS Announcer 194 │ Resolved │ 80 │ 4.3.5 │ openHAB Core :: Bundles :: mDNS Service 258 │ Waiting │ 80 │ 4.3.5 │ openHAB Core :: Bundles :: Configuration USB-Serial Discovery using ser2net mDNS scanning 265 │ Waiting │ 80 │ 4.3.5 │ openHAB Core :: Bundles :: mDNS Suggested Add-on Finder ```