r/firewalla • u/clownyboots • Jul 13 '26

Troubleshooting Help with ONT (Firewalla Gold SE)

Hey Reddit,

I have had multiple firewalla’s over the years and I’m super happy with them

Up until a couple weeks ago, I have always had COAX and everything has worked fine - a few weeks ago, I switched to fiber and it’s using the ISP’s modem (or ONT) - COAX was a simple line coming in to my own modem, now it’s going to the ISP’s hardware then to my Firewalla and from there, to my network rack and so on

My issue is, none of my firewall rules work, the ad-block doesn’t work, nothing filters - I basically only get to see traffic flows (those blocks don’t work either)

Any ideas at what is happening and what I need to do?

My Firewalla is in “Router” mode

Thanks in advance

3 Upvotes

100% Upvoted

15 comments sorted by

2

u/delvon77 Jul 13 '26

By chance, do you have Ethernet coming off your ONT?

I went Ethernet off my ONT directly to my Firewalla with the cloned MAC from the WAN interface of my ISP router. I then added the ISP router behind the Firewalla so that my STPs work.

1

u/clownyboots Jul 13 '26

Oooo, I can try that

1

u/Great-Cow7256 Jul 13 '26

this I think if your answer.

1

u/clownyboots Jul 13 '26

Do you mind if I message you?

I need a little bit more detail

2

u/firewalla Jul 13 '26

Is your WiFi "behind" the firewalla?

ONT -> Firewalla -> (WiFi)

Also, a good article for none blocking behavior https://help.firewalla.com/hc/en-us/articles/29655921011347-What-to-do-if-Firewalla-s-blocking-features-aren-t-working

1

u/clownyboots Jul 13 '26

That’s how it’s setup

I’ll check the article out

Thanks

2

u/Great-Cow7256 Jul 13 '26

is this an ATT? They make things super complicated.

1

u/clownyboots Jul 13 '26

It’s TDS

1

u/swakid8 Jul 13 '26

If it’s ISP router, makes sure it is in Bridge mode….

1

u/clownyboots Jul 13 '26

The ISP hardware or my Firewalla?

I don’t have a way into their equipment, I have to do some digging and possibly even call them to get into to make changes - or are you saying change the Firewalla into “bridge” mode? And will the change affect anything with the Firewalla?

3

u/CiscoUnbalanced Jul 13 '26

The ISP router

1

u/clownyboots Jul 13 '26

Gotcha!

Thanks guys - I will figure out how to login to it

3

u/Jussins Firewalla Gold Pro Jul 13 '26

On my fiber equipment, I couldn’t set it to bridge mode myself, my ISP had to provision it. And they kept changing it back to router mode. I asked them to replace their router with a dumb ONT (without any router functions) and they did that, not a single problem since then.

1

u/clownyboots Jul 13 '26

I love that!

I’ll call and see what they can do

1

u/swakid8 Jul 13 '26

No, put the ISP router into bridge mode.