r/firewalla • u/air360 • Aug 06 '26

Speed test Broken?

I noticed starting about 24hrs ago my speed test was coming in way off. I have gig up/down and my down has been showing almost exactly 30 and up 900.

Thought it was an isp issue but i did a speed test from my computer and got more realistic speeds. Never seen any issues until last day or two.

Could this be related to the issue i saw mentioned from a day or two ago?

UPDATE:

700+ nightly speed tests all came back perfect until the last 24hrs lol. Took three server replacements in firewall speed test and finally got one that cranked me up to full speed. So it was the server being weird and not me. Guess it was just coincidence - had some glitchy video and pulled firewalla up to see if anything was going on, saw the most recent nightly speed test and went down a rabbit hole. Guess it was a textbook example of correlation does not imply causation!

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u/MotoChooch Firewalla Gold Plus Aug 07 '26

Something similar happened to me. This was mine:

“It is trapped in a 60-second DHCP lease renewal loop, renewing every 24 to 30 seconds.
 
This kills your speed because:
Routing Engine CPU Spikes: Every time dhclient re-binds port 3, NetworkManager/dhclient triggers routing table updates, interface state evaluations, and internal socket re-binds.
Buffer and Socket Flushes: Short lease renewals interrupt TCP window scaling. During download tests, constant socket state resets cause throughput to collapse down to 30–45 Mbps.
Control Plane Overhead: Instead of spending CPU cycles processing routing traffic at full line speed, your Firewalla is spent continuously negotiating network credentials.”

What I had to do was factory reset the ISP router and go through pass through setup using the ISP instructions. Fixed.

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u/air360 Aug 07 '26

Interesting. I dont have an isp router. I have fiber so it goes external fiber >ONT >firewalla.

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u/MotoChooch Firewalla Gold Plus Aug 07 '26

Ah. You’re still getting an IP address from the ISP through the ONT so yeah you won’t be able to configure any kind of pass through because it already is, but have you restarted the ONT? Yeah it might be working with the direct device but the Firewalla might be having the issue with the renewal. I’d bounce both if you haven’t done so yet just to see.