Sagemcom FAST 5364 Bridge Mode

[jgd1955]

Hi - anyone know how to enable Bridge Mode on the Sagemcom FAST 5364 modem router that comes with Fibre 65.

I've purchased a couple of eero 6e pro devices to replace inconsistent wifi extenders and eero suggest putting the modem/router in to bridge mode.

I've logged in the the admin GUI and poked around including in advnaced but can't see anything that mentions bridge or passthrough mode. I can see I can disable wifi but that's not what I should use is it?
I'm familiar with the use of SSH - I configure Unix web servers.

[Mandisa-TT]

I understand and thank you for the information, @KeithFrench will look into this for you.

[jgd1955]

Thanks Mandisa but I have 2 eero because my existing wireless network doesn't reach the office in the back (a converted outhouse attached to the house) and the WiFi extenders I was using were inconsistent in performance.
I need the WiFi 6 mesh that the 2 eeros offer

[jgd1955]

@KeithFrench I was trying to set up the two eero 6 pro I purchased as per eero support. They recommend putting the routing functionality of any existing modem with built in router (like the Sagemcomm 5364) in bridge mode to make best use of the eeros as per this article https://support.eero.com/hc/en-us/articles/208276903-Bridge-Mode-and-Double-NAT

I've used double NAT for now

[Mandisa-TT]

Thank you so much @KeithFrench 

[KeithFrench]

Hi @jgd1955 

@Mandisa-TT has asked me to help you. No current TalkTalk router supports bridge mode, although they can be configured in a similar way. To save me having to read through every post, please can you summarise exactly what you are trying to achieve & I will tell you how to configure the router.

[Mandisa-TT]

You could put eero into Bridge mode and let the FAST 5364 handle routing, but you’d lose eero’s advanced features (like parental controls and security).

[Mandisa-TT]

I understand. 

What you’ve done—disable Wi-Fi on the FAST 5364 and run eero as router—is perfectly workable for most scenarios. The main drawbacks are with inbound port forwarding and some VPN/gaming setups.

[jgd1955]

I know this.

Bridge mode is available for the FAST 5364, but you would need to send a JSON-String, most probably via a POST request to the correct endpoint. I can't find any exact references to doing this 

I've set up the 2 eeros I have using double NAT and disabled WIFI on the Sagemcomm.

I will reevaluate my options in September when my TalkTalk contract is due for renewal.

[Mandisa-TT]

Hi @KeithFrench any suggestion on this.

[Mandisa-TT]

Here’s what you can do:

Log into the FAST 5364 admin interface (usually 192.168.1.1).

1. Go to Advanced Settings → Home Network → LAN IP.
   • Assign your eero a static IP (e.g., 192.168.1.2).
2. Navigate to Advanced Settings → Firewall → DMZ.
   • Enable DMZ and enter the eero’s static IP.
3. Disable Wi-Fi on the FAST 5364 (under Wireless settings).
4. Connect your eero gateway to a LAN port on the FAST 5364.
5. Put your eero into Router mode (not Bridge mode).

[Mandisa-TT]

On FTTC (Fibre 65), you still need the Sagemcom FAST 5364 because it handles the VDSL connection, so you can’t bypass it like with full fibre. That means:

• True bridge mode isn’t available on this router.
• The best workaround is DMZ + disable Wi-Fi to avoid double NAT issues.

[jgd1955]

The Sagemcom 5364 is both a modem and a router. The question was to put the router in passthrough or bridging mode as eero recommends. That can be done but TalkTalk are unable or unwilling to help with this.

Although not ideal my choices are to use double NAT mode or replace the Sagemcom with a more configurable third party DSL modem router

[Mandisa-TT]

Thank you @ferguson 

[ferguson]

You need a modem (or ONT) in order to use eero devices. Otherwise they just won't work. 

[jgd1955]

Nambuso - very unhelpful as I clearly stated that I had Fibre 65 in the original question.

[jgd1955]

According to Gemini AI 

Enabling bridge mode on the

Sagemcom FAST 5364 (TalkTalk Wi-Fi Hub) isn't straightforward as it lacks a simple GUI option, requiring advanced methods like sending specific JSON commands via developer tools (like BurpSuite) or enabling SSH for firmware tinkering, often involving flashing older firmware first

That's super annoying since I've just spent £300 on 2 eero 6 pro units

[jgd1955]

There's no refernce to bridge mode in the official sagemcom manual https://www.manualslib.com/manual/2554778/Sagemcom-Talktalk-Fast-5364.html#manual

[nambuso-TT]

@jgd1955 After reviewing your account, I see that you are on the Fibre 65 package, and unfortunately, the eero device you're trying to connect to your Sagemcom FAST 5364 router is not compatible with this package. It is designed to work with the Full Fibre package instead. Since we've explored all other options for setup, this compatibility issue may be the reason we're unable to establish the connection.

[jgd1955]

There is no Bridge Mode in the Web GUI. Do you have a screenshot?

According to this thread there is no way to do this https://community.talktalk.co.uk/t5/Full-Fibre/Bridge-Mode-Sagecom-Fast-5364/m-p/3092290/highlight/t...

[nambuso-TT]

Please try the below steps to Enable Bridge Mode on Sagemcom FAST 5364

1. Access Modem Settings: Connect and log into your modem's web interface.
2. Navigate to WAN or Internet Settings: Find the Bridge Mode option.
3. Enable Bridge Mode: Toggle the setting to enable it.
4. Save Changes and Reboot: Confirm the changes, then restart the modem.