Failover with passthrough (RUTXR1)

So, I just bought a RUTXR1 for this rather simple task, which may seem like some serious overkill, but hear me out…
I have been without internet access almost all summer, due to my ISP having a vacation period and not wanting to send any of the few technicians they had at hand, to a non-premium customer :frowning:
So I decided to fix that for the future by creating an automated failover, and in the same move getting rid of some excessive equipment that has proved unnecessary. By switching to the RUTXR1, I no longer need the dedicated fibre converter (SFP goes directly into the R1), I have the WWAN modem built in (no more external modem) and I can also dump the ISP-supplied router, which was in bridged mode anyway (so it didn’t add value; just one more device that could cause trouble and limit throughput).
However, I’m still not ready to jump ship regarding my existing firewall/router. It has a nice integration with the rest of my network setup, and I’d like to keep it for the moment.
So all I want is the RUTXR1 to act as a transparent auto-failover interface, that passes on whatever data it gets via the SFP (or the WWAN modem, in case the SFP link goes down) to my router connected to the LAN1 port. I don’t want any NAT in the R1 to avoid double-NAT:ing, but I’m not sure what to do about the DHCP? Preferably I’d like my current router/firewall to do the DHCP client requests, but I’m a bit uncertain how that would work in a failover scenario. My existing router/firewall has to notice that the ISP has changed, and then it needs to make a renewed DHCP request, I guess?
If this type of setup is already covered for other RUTX routers, then please direct me there.


Firstly, I’d like to clarify that Teltonika Networks routers, including the RUTXR1, are not designed as GPON routers. If you’re currently relying on an ONT or ONU for your connection, you’ll likely need to keep it in place. While there’s a small possibility that an ONU/ONT SFP module could work with the RUTXR1’s SFP port, we haven’t conducted tests to confirm this compatibility. If you’re considering a test, please consult with your ISP about the appropriate SFP module to ensure compatibility on both ends. If testing isn’t feasible for you, I’d recommend retaining the ONT/ONU device provided by your ISP, as chances of it working are quite slim.

In terms of DHCP, bridge, and passthrough configurations:

Bridge and passthrough modes are available for the mobile interface. In bridge or passthrough mode, many of the device functionalities are disabled . For example, the bridge mode won’t support failover. Thus, to ensure proper operation and failover, I would suggest using Mobile in normal NAT mode and using wired WAN as the main connection.

In terms of failover, when the primary wired WAN loses internet connectivity (fails to ping the specified host from this interface), the RUTXR1 will switch to using its mobile interface.

The RUTXR1 would act as a DHCP server on the LAN side, with your other router functioning as the DHCP client. For the WAN interface (which connects to the ONT/ONU), the RUTXR1 would likely operate as a DHCP client.

On a side note, NAT (masquerading) is enabled on the WAN zone by default and can be disabled in Network → Firewall .

Kind Regards,

I took a leap of faith and replaced my USG-3 with the RUTXR1. So far so good! :slight_smile:
Now I need to get my Wireguard Site2Site back up, as well as understand how to re-enable the Ubiquity default guest network (Using VLAN 2 and
But I guess I’m not the first one to have done this switch, so there are hopefully some guides or write-ups on how to proceed.
Thanks for the explanation; it made it easier to switch over completely.


We have quite a few guides available on our Wiki: Teltonika Networks Wiki
For example, here are a few that might be helpful in your use case:

Let us know if you experience any issues!

Best regards,

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