How To Connect 10Gbe SFP+ WAN2 Ubiquiti Unifi UDM-PRO To 1Gbe 2.5Gbe 5Gbe Modem

Author:
phil
Created:
Monday, January 24th, 2022
Last Updated:
Monday, January 24th, 2022

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Around November 2021, AT&T opened up for fiber internet in my area. Naturally I wanted the full duplex 1000Mbit over Cox Cables offering of 940Mbit x 35Mbit, so I made the switch. The Zyxel USG gateway I had at the time couldn't handle the new bandwidth with the SPI Firewall (or so I thought... different story) so I picked up the Ubiquiti Dream Machine Pro (UDM-PRO) since they claim the SPI firewall can handle up to 3.5Gbit of traffic on the WAN port. I got the new UDM-PRO, hooked everything up and was happy to have a new appliance to play around with that is easier to manage than the Zyxel (or so I thought... again, different story).

With the new UDM-PRO and the new AT&T modem, I naturally started poking around at the interfaces and noticed on my AT&T modem that it was connecting at 10000 Mbit. I figured it really meant 1000Mbit since that's the service I'm paying for and moved on. But it kept creeping back into my mind that I might actually be connected at 10Gbit... "Is this too good to be true?" I thought to myself and wanted to dig in and find out first hand. This is where I started running into all sorts of "fun" trying to get things to jive.

When I picked up the UDM-PRO, I also grabbed the SFP RJ45 10G Module to have on hand. Having very little hands on experience with SFP modules in general, let alone 10G networking, I stuck the 10G SFP into the WAN2 port on the UDM-PRO and plugged a cable into the 5Gbe port on my modem fully expecting the 10Gbe SFP card to auto-negotiate on the 5Gbe port. Nothing. The UDM software didn't even show anything was hooked up. I tried the 2.5Gbe port. Still nothing. Finally I popped into the GUI to force auto-negotiation which is where I noticed there are only two options for the 10Gbe port speeds and they are 1Gb or 10Gb. This led me down the rabbit hole of trying to find out if the 10G SFP+ port could even connect to my modem and the internets with all their wisdom informed me that it in fact can not negotiate on speeds outside of 1Gb or 10Gb.

Disappointed, I left well enough alone and gave up. A few weeks went by and I just couldn't shake the thought that I "might" have more than 1000 Mbit. I mean really... If you were paying for 1000 and thought there was the slightest chance you might be passing Go, collect 10000Mbit, wouldn't it keep you awake at night? A few more weeks went by and I started digging in to see what it would take to convert one of the four 2.5Gbe or even the one 5Gbe port on my modem over to the 10Gbe SFP+ port on the UDM-PRO.

This led me down a handful of rabbit holes, mostly where folks suggested getting a switch that could negotiate on the various speeds but I didn't really like the idea of wasting a perfectly good switch on this idea. Finally, I ran across the Planet Tech XT-705a Media Converter. This is a device that is designed solely for the purpose of converting 10Gbe SFP+ ISP connections to RJ45 Network connections. You read that right. It is advertised to go from the ISP fiber connection to an RJ-45 network. Nothing in their documentation (that I could find) says anything about going in reverse. It's kind of implied, but not out-right stated. I was kinda bummed since I didn't know if it would actually work or not, so I kept looking and after finding some really cheap looking made units on eBay that ship from China, I decided to take the $180 plunge and try out the Planet Tech XT-705a media converter anyway.

I picked up the XT-705a over on Newegg for around $185 out the door and also the Ubiquiti Uc-Dac-Sfp+ Direct Attach Copper Cable Sfp+ 10Gbps 0.5 Meter for roughly $24 out the door. Total with shipping and tax was $211.

When they arrived, I think I expected more from the XT-705a but it really is pretty underwhelming. You get the unit and power cable. It's a really straight forward unit.

The UC-DAC-SFP+ cable has a quality build feel to it which is kind of expected coming from Ubiquiti but at a price point that is hard to beat considering individual SFP fiber cards can run $25+ and $60+ for RJ45 cards. (Planet Tech wants $165 for their RJ45 SFP+ module...)

Product details aside, I hooked everything up and got a green light on the Media Converter. At first, I thought the dots on the side of the RJ-45 port would light up telling me what the negotiation speed was. Nope... those are just painted on dots. I felt kind of dumb but it did have a green light on the right and that means it is connected at either 5G or 100M.

I don't know why but I didn't expect it to work. Or I expected to have to reboot stuff. Before digging in, I checked the internet on my phone and it went through no problem. I figured maybe it was routing through the cell internet so I hopped on my desktop and poked around on some websites but everything popped up just fine. I finally decided that since the device is a non-managed unit it, doesn't require a bunch of boot up time to work. If the light is lit, it's working and there literally isn't anything to it outside of plugging in the cables and power.

Next I decided to start checking the UDM-PRO and the AT&T modem to see what they were negotiating for speed. The UDM-PRO showed the SFP+ WAN2 port in use and negotiated at 10Gb and the modem showed that the 5Gb port had established connection.

Unfortunately when doing a speed test, I never did end up with the 10Gbit speeds I was hoping for. I get around 980Mbit DL but I've seen as high as 1200Mbit on the UL. I haven't decided if the speed test site that the UDM-PRO uses isn't trying to handle faster speeds but since nothing else in my network is faster than 1Gbit, I can't really play around with different speed tests to find out. Oh well. Since my modem can handle up-to 5Gbit speeds, I also wanted to future-proof my network so when the day comes that higher speeds are available to the modem, at least the pipe can handle it. I'm sure I'll upgrade some other stuff over the next few years but for now, I have a UDM-PRO that can eventually handle up to a 5Gbit ISP connection.

Oh, and if you have the UDM-PRO SE, this same method will also work even though the UDM-PRO SE RJ45 WAN port can negotiate at 2.5Gbe. (Seriously... why not 5Gbe Ubiquiti??)

Using the WAN2 port as the WAN Port

If you end up using the WAN2 SFP+ port on the UDM-PRO or UDM-PRO SE, chances are you'll want to make the WAN2 port your primary port.

Early on, this wasn't possible but Ubiquiti fixed the OS software so it is now possible to do. I'll walk you through the steps because it's farily easy but keep in mind that whatever you have setup for the WAN port such as DNS etc, you'll have to mirror over on the WAN2 port. You might want to take care of that first before moving things around.

Note: These instructions are from the 1.11.0 UniFi OS Version. Newer or older versions may be slightly different.

  1. Login to your UDM-PRO / UDM-PRO SE
  2. Click on the Network app
  3. On the left side, click on the Unifi Devices link
  4. Click on your UDM-PRO / UDM-PRO SE in the main table. This will open a side-bar window to the right
  5. In the side-bar menu click Settings
  6. Find Ports and click the down arrow to make it expand
  7. Scroll down to WAN Ports and click on Configure Interfaces below the two WAN port information table
  8. Change Port 10 (WAN2) to Disable
  9. Change Port 9 to WAN2
  10. Change Port 10 from Disable to WAN
  11. Click Apply at the bottom of the menu side-bar
  12. Done!

If you click on the "Overview" link at the top of that side-bar menu, it should now show the WAN speed as 10GbE.

The only other thing to tweak from here is the ingress and egress bandwidth. This can be found in the Network app -> Settings -> Internet and then clicking on the WAN row of the Internet table. From there, click the Advanced link and scroll down to ISP Capabilities. Set your ISP Upload and Download speeds, save and go run your speed tests!

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