The 2.5 Gig port of Orbi is limiting network speeds received by the ISP Modem

I think you quoted my post from a different thread in your OP .  I have not tried updating to the latest RBR firmware that just came out a couple days ago, but am wondering if it resolves this issue.  I actually got a new modem from xfinity and immediately when the tech hooked it up, had the same exact behavior.  That at least rules out faulty hardware with the xfinity modem.  Since we have the same firmware version as the 860 and 960 series, I'm hopeful that this will be resolved eventually with a firmware update.  Let me know if you've tried 7.2.6.31 and what the results are.

No problem.  Yeah, it is a weird issue and I've seen people with different models (i.e. the 960) also post about it.  I updated my satellites just now to .31 but need to hold off with the router as my family will flip if I throw them offline lol.  At least the workaround is easy.  Since the RBR850 has no 2.5GB LAN ports, just use any of the other gigabit ports on your XB7 modem instead of the orange 2.5GB port.  WiFi speeds on the RBR850 will not be faster since these modems are WiFi 6 and the RBR850 has no multi-gig LAN ports.  I'll also post back after I update the router to let you know if the issue persists with the multi-gig port.  I can reproduce it easily.

After updating last night, the issue was still present.  Although I will say the new firmware feels like I am getting faster speeds over WiFi.

The 850 series will never see over 1Gb on the LAN ports since they top out at 1Gb only connection rates. 

If you want to see over 1Gb on the LAN side, you'll need a 960 or 970 series Orbi or a RS700 router which all have mult-gig LAN ports. 

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musicman0725 wrote:

No problem.  Yeah, it is a weird issue and I've seen people with different models (i.e. the 960) also post about it.  I updated my satellites just now to .31 but need to hold off with the router as my family will flip if I throw them offline lol.  At least the workaround is easy.  Since the RBR850 has no 2.5GB LAN ports, just use any of the other gigabit ports on your XB7 modem instead of the orange 2.5GB port.  WiFi speeds on the RBR850 will not be faster since these modems are WiFi 6 and the RBR850 has no multi-gig LAN ports.  I'll also post back after I update the router to let you know if the issue persists with the multi-gig port.  I can reproduce it easily.

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Has a factory reset and setup from scratch using a wired PC and web browser been performed since v.31 was applied? 

Was speed testing with all other devices including the RBS, turned OFF and disconnected from the RBR tried. 

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
Be sure your using a good quality LAN cable between the modem and router. CAT6A STP is recommended. 

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gregnauman wrote:
Yea when i had just gigabit speed internet for some reason I had my Xfinity modem 2.5 port plugged into a 1 gig port of the router and never had the drop off. Maybe I had done this because of issues but cant remember
I then upgraded speed and couldn't get over 1GB. It was then I realized, oh it was plugged into the wrong port. Soon as I moved it to the multi gig port i was able to get the faster 1.4 Gig speed but then i had the drop off problem with anything plugged into the router ports. Wifi has been fine.
I finally tested it with a laptop connected direct to the Orbi router and sure enough it seems to be an Orbi router problem IMHO.

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I've updated mine. I'll be testing for this. I've only seen you and the other poster having this issue. 

I never saw this on v.21 as others also were testing this and never mentioned it. 

Something to try v.31 and as recommended in the FW post, a factory reset maybe needed. 

Ok, Installed v.31 FW. Power cycled then factory reset the system and setup from scratch. 
RBR connected to a CM3000 cable ISP modem. 1Gb WAN Port on CM Modem.

ISP - Sparklight

1Gb/50Mbps ISP Speed plan. 

Armor, SPC and Traffic Meter not enabled. 

RBR Onboard Speed Test:

Ooklas Installable Speed Test app on wired Windows 11 PC ran 3 times:

What brand PC and and brand and model # of Ethernet adapter are you using to speed test with? 

I have HP z640 with Intel Built in Ethernet adapter I218-LM. 

Yes. Never saw this in my speed testings. Speeds shot up immediately to around 800Mbps and climbed up from there on all 3 tests. 

What speeds do you see when you run the onboard speed test on the RBR?

Only thing I can think of is something on the speed test device or between the ISP modem and RBR, is making the RBR slow down when speed testing thru the RBR. Something is bottlenecking the speed. 

To clarify what I previously posted, I saw this issue with the 2.5GB ports slowing down 1GB ports posted on a thread

about a 2.5GB mikrotek router (which I don't have).  

https://forum.mikrotik.com/viewtopic.php?t=182691

I think the common factor in our setup is we both have xfinity modems (I have the XB8 and the OP has the XB7).  I saw threads posted on the netgear forums for the RBR960 where users reported reduced speeds over the 2.5GB WAN.  

https://community.netgear.com/t5/Orbi-WIFI-6-AX-AND-Wi-Fi-6E-AXE/Orbi-960-speed-via-Ethernet-2-5-port/m-p/2298495

Of course that is much more impactful than on an RBR850 where it doesn't really matter if our cable modem links at 2.5GB or 1GB since none of the LAN ports support greater than 1GB speeds.  Still, the issue is really easy to work-around with an xfinity XB7/8 modem as long as you know to not use the orange 2.5GB port on your cable modem.

Specifically for me, my speeds start at around 800Mbps and climb to 860Mbps on a LAN port connected directly to my RBR850 when using the 2.5GB port with my XB8 modem.  They quickly get to 940Mbps when using any of the 1GB ports on the XB8 modem.  I'm using the speedtest app for MacOS on a 14" MacBook Pro (M2 Pro, 2023) connected to an Anker USB-C hub (565). 

Also, my Apple TV4K (3rd gen) connected over ethernet consistently gets 940Mbps with the speedtest app, however, it gets closer to 480Mbps if the RBR850 is connected to the 2.5GB port on the XB8.  The AppleTV is going through one of the RBS850 satellites that is connected via ethernet to a 2.5GB TRENDnet switch which links up to the RBR850 in another room (ethernet backhaul for all my satellites).  Finally the Orbi app speed test results are always better if I use the 2.5GB port on the XB8 (closer to 1.2Gbps vs 940Mbps). 

Found a thread on xfinity forums as well with posters who have the issue with the 850 and 960.  Common denominator seems to be the XB7 and XB8 modems.

https://forums.xfinity.com/conversations/your-home-network/slow-ethernet-connection-between-xb8-mac-mini-and-netgear-orbi-router/65adc34222d9f633de7ef816

All those particular modems are gateway modems. Built in router and wifi. Could be anything on them that maybe causing problems. 

I can confirm that my Orbi have not seen any speed issues when Connected to a CM3000 with a multi gig port and last gateway modem I had online was my CAX80 that also has a 2.5Gb port in back. When in modem mode, Orbi is constantly seeing over 900Mpbs on wired speed tests behind the CAX80. Thats one thing I always test and check for when I use any modem I put online and any router connected first thing. I test 3 speeds in a row to be sure speeds are constant across each test. 

Just seems like these particular ISP gateways maybe the cause or in part play a role in what those of you who have these modems for this ISP. I would think that if these modems had actual bridge mode or modem only mode, should not see this kind of issue. Or if the DMZ was actually good and not inhibited by anything while in gateway mode, the DMZ or IP pass thru should cause any slow downs with an externally connected router. 

Seems like something the ISP should take a look into. However, being an ISP, may or may not look into it as there looking to only support there stuff and anything externally connected, they may not care to look into. Or blame NG for it. 

Something that some of you could look into, CC/XF support user owned modems, Might look into your own modem and test something out as in a modem only option. See if this modem only unit exhibits the same issues or on with Orbi systems. I don't have this ISP here however I believe Orbi systems work as expected with modem only units and not these particular ISP gateways. If you happen to find that non XB ISP modems work with Orbi systems, this would be something to let the ISP know about and point them to the XB series of gateways being something they should look into to resolve, if they care too. 

I know of others that are on CC/XF and use there own modems and have not experienced or mentioned seeing this slow down when speed testing with there Orbi systems. 

Good Luck. 

Just a data point...

I have my 960 and two Sats (wired backhaul - old house, probably CAT5 - whatever was the thing in 1996). The 960 is in Router mode connected to an xFi XB7 in Bridge mode - to port 4, the highspeed port on the XB7.  On a good day, I get 1400 download, 240 up tested at the 960 using the Orbi App.

My Apple TV is normally WiFi right next to the RBS and gets 681/233 on SpeedTest.  I just wired it to the RBS and got 932/234 which is right near max possible.

In my experience, this works as expected, although we don't typically use the RBS ports other than for testing or trouble-shooting.  And I have not tested them lately with the wireless backhaul, but when I first set it up, that worked fine as well.

I read that Xfinity community thread ( ‎Slow Ethernet Connection between XB8, Mac mini, and Netgear Orbi Router | Xfinity Community Forum ) and it seems like the problem is seen with the XB8 and not the XB7 from what I can see.  I'm glad we never let them "upgrade" us to the XB8. 🙂 

I am the OP on that Xfinity thread that you are referencing. Short answer is that, when I connect the WAN port on the Orbi to the 2.5Gbps port on the XB8 in bridge mode, the wired ethernet speeds on my LAN slow down.  When I connect to a 1Gbps port on the XB8, things perform normally but of course with a 1 gig limit.  This never happened with my previous XB7 but Xfinity would not pursue the matter.

I haven’t had the energy to pursue it, since the wired connection to my Mac is 1 gig and my wireless speeds have been more than satisfactory. I have been waiting for an Orbi software update to see if that might change things, and I see that one arrived a few days ago. I’ll give it a try in the next few days and see what happens…

No surprise, but I updated my Orbi to the v7.2.6.31 firmware and the way the device plays with the Xfinity XB8 on the 2.5 Gbps port has not changed.  It would be nice if the Xfinity and Netgear engineers would talk to each other rather than have the users ping pong between the 2, but oh well...