OBI2182 drops off LAN when Laptop shuts down (Resolved)

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Vermonter:
This is weird.  I've looked (and searched) the forums so apologies in advance this is already resolved or has a FAQ or something.  I've requested help from Poly customer care but they're blaming my LAN without offering any real suggestions.

Situation:

I have recently bought two OBI2182 to replace a couple of Obi200 and (old) Polycom POTS speaker phones.  The 2182's are running Software version 6.2.3

The phones works perfectly until I shutdown or suspend my laptop (a Thinkpad X1 Carbon running Kubuntu 21.04). Then they drop off my LAN and stay off until I power cycle the units. (I.e., I can't ping them nor connect to them via my browser, a soft reboot doesn't help).   Powercycled they work great until the next time my laptop shuts down.

I've fixed the DNS servers to 8.8.8.8 & 8.8.4.4 to no effect. The phone is configured to use Google Voice & 12VoIP, obviously both become unavailable when the phone drops. I also tried fixing the Switch Port 1 Speed to 100 AUTO, also to no effect.

One of the phones is connected to and powered by a Netgear GS305P switch (which my laptop is on). The other is on a different LAN segment and powered via its own adapter.  Since it drops at the same time my desktop switch is presumably not the culprit.

Anyone seen this or have a fix?

Thanks.

Sheffield_Steve:
The only conclusion I can come to is that your laptop is the source of the internet.

e.g. The laptop connects to the internet via wi-fi and the switch/Obi is getting internet via the laptop. (Maybe via a docking station?).

A simple way to test would be to switch off the wifi on the laptop and see if the OBi looses connection.

Vermonter:
Turned off wireless on the laptop, phone is unaffected.  The laptop uses a wired connecting when I'm at my desk (its attached to the same ethernet switch as the phone).  Also, the phone boots up just fine when the laptop is turned off and continues to work after the laptop boots up itself...until I shut the laptop down.

I haven't configured the phone's WiFi interface.  Checking on my router (a Netgear R8000 running DD-WRT) the MAC address for the phone is the wired one shown on under the phone's "Product Information" button.

Thanks for the suggestion though.  It sure feels like something at the Ethernet level, but I've tried swapping cables and the two phones disconnect simultaneously but are connected to different switches (though on the same LAN).

Thanks for the suggestion though!

Sheffield_Steve:
Does the phone work if you disconnect the laptop from the switch?

Vermonter:
Good suggestion!  Unplugging the laptop's ethernet cable without shutting down doesn't seem to have brought down the phones...but plugging the ethernet cable back in did.

However, yes they worked fine after I unplugged the laptop and powercycled until I reconnected the ethernet cable.

Absent another suggestion I'll try running without wired ethernet (gah) for a few days and see if the phones are stable.

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