Weird Network Behaviour - Unable to Reach Specific Hosts
Super frustrating day today. Burnt 3 hours before I bailed on troubleshooting further. Love my Firewallas but man...
TL;DR: network suddenly died, thought it was DNS related, changed DNS network settings to ISP, most of my network returned, but I couldn't reach/ping 3 critical network devices (my NAS, Plex Server, and my docking station)
Got a notification from my Uptime Kuma dash that a bunch of internal services running on my NAS went down (docker containers running various things), and my Uptime Kuma task managed to send a notification that NextDNS was down. Had to take a work call on my mobile because my MacBook's network, which was hooked up to a docking station (Thunderbolt to Ethernet), died. Tried a few quick things, no joy, went out and to hard reboot my media converter to see if that would fix things, nope... left it unplugged and did my call on my mobile.
After my call was over, things still weren't working, so I decided to revert my DNS on my Firewalla to my ISP's from NextDNS hoping this would solve the issue.
It did. Sort of. Everything came back fine, except my Mac connecting to the docking station. Disabled that interface and connectivity came back, Thought the docking station was FUBAR, so I unplugged/plugged that in. Everything else worked on it, so it was odd that the Ethernet interface stopped. Figured that was the culprit, but it wasn't.
Rebooted the Firewalla from the app a couple of times, and that didn't make a difference. Eventually, things seemed to be okay (I have another MacBook that had connectivity).
Figured out that I was unable to reach 3 devices - 2 had reserved IPs. My NAS and my Plex server.
I could NOT reach them. Pings came back unresponsive. I was able to ping everything else. Thought maybe it was somehow related to my eero's. Rebooted them. Nope. Still had the issue. Spent 3 hours rebooting the Firewalla, removing rules, trying everything I could before I pulled it and reverted back to my ISP modem/router combo.
No issues. Was able to reach/ping the previously unable to reach interfaces, including the aformentioned docking station.
Reboots of the Firewalla didn't make a difference. It was like those specific devices were blocked for some reason. Rebooted those specific devices. Didn't make a difference.
Anyone have any ideas what happened? Why I couldn't reach those devices?
I had to leave that location and won't be able to return to try to reconfigure/install the Firewalla for a couple of weeks.
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Yes, on the LAN. Any ideas what could have been causing it then? Seems odd that the only two IP reservations in the Firewalla were the devices I couldn't reach. I rebooted everything, including the dumb gigabit switch, and then eventually reverted to my old setup, and immediately the two internal IP addresses were accessible.
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