C

Visitor

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2 Messages

Thu, Sep 22, 2022 1:11 AM

Cannot Achieve Gig+ Wired Speeds After "Network Upgrades"

Hello,

Apologies ahead of time because this will be a very long post, please bear with me.  

Around the beginning of last year I was looking for a modem/router combo that would allow me to take full advantage of my 1.2 Gig Xfinity Internet service using a hardwired ethernet connection. 

I initially purchased the Arris S33 since it is advertised as having a 2.5 gig port.  I used this in combination with my ASUS RT-AX86U Wifi 6 router which also has a 2.5 gig port and 4 x 1Gig ports. 

I quickly realized that I would not be able to achieve WIRED Gig+ speeds with this combination.  Testing the S33 directly connected to my desktop computer of course gave me over 1 gig speeds.  But since the router I have only has the ONE 2.5 gig port (which can be used as a WAN port), I was unable to achieve over 1 gig hardwired speeds since the other ports only achieve up to 1 gig.

So the answer I thought?  Ok I will have to purchase a new router that has multiple 2.5 gig ports if I want to achieve wired Gig+ speeds...  but those can be EXTREMELY expensive.

After doing some research I discovered something called WAN Aggregation/Link Aggregation.  How cool is this!  You can use multiple connections from a single cable modem (when they generally only have one) to increase the data throughput to achieve over gigabit speeds.    

I ended up purchasing the Motorola MB8600 ->  https://www.motorola.com/us/mb8600/p

When I purchased this cable modem last year I did not see anything that suggested this modem was not supported by my current Xfinity internet plan.  It is advertised as achieving "up to 3.8 Gbps" Downstream.

My MB8600 + RT-AX86U router allowed me to easily achieve over gigabit hardwired speeds with WAN Aggregation enabled.  I would sometimes see as high as 1400 Mbps!  I was very happy that I decided to get this cable modem and did not need to purchase a new extremely high-end router that had multiple 2.5 Gig or faster ports.

My girlfriend and I moved to a new apartment last year at the end of May.  New location, same solid speeds.  I would still easily achieve over Gigabit hardwired speeds.

Around April of this year we received a notice from Xfinity that our area of town was "identified as needing network upgrades."  I thought great!  I would occasionally experience an unstable upstream connection so if anything I figured these "network upgrades" would make my connection ever more stable.

This is where things started to go wrong.

After these apparent "upgrades" to the network I was only able to achieve around 900 Mbps max speeds.  I realize "only 900" is a silly thing to say and being a bit extreme - but you have to realize that I have been paying for "Gig+" internet (and regularly achieved those speeds) before and now only on extremely rare occasions do I see it get close to 1 gig.  

I am fully aware that network congestion is a thing - but I have tried countless different speedtest websites (including the Xfinity speedtest tool) and at different times of the day when there shouldn't be many people using the network.  Same results.

I figured maybe there was some issue with the wiring to the apartment.  The building was apparently built in the 50s and the cable line into the apartment wasn't even from a jack - it was just a loose cable hanging from the wall... yet I was able to easily achieve the full 1.2 gig speed from my plan with my current equipment.

Moving forward to last month - we moved to a new place in the same area of town.  Building is a small house that was built in 2017.  Awesome!  Cable line should be solid and I might be able to experience my full speeds again.

Nope, same issue.  Using the same equipment (tested out multiple ethernet cables to my PC) and got the same results.  I would only achieve at best around 75% of the 1.2 Gig speeds I am paying for.  And I DO NOT use a VPN.

After multiple incredibly frustrating phone conversations with outsourced tech support representatives I was able to reach a "Level 2" advanced tech support rep based in the United States - PLEASE make that an easier process for people that know what they're talking about when it comes to more advanced tech issues.

She agreed that my issue didn't make sense since I have been using the SAME equipment for a year and a half now and regularly achieved the Gig+hardwired speeds before April of this year.  She also reiterated that using a hardwired connection should allow me to achieve the full speeds - I do not care about getting Gig+ WiFi.

She scheduled for a tech to arrive today to further inspect my issue.

Tech arrived today - have to give a shoutout to Don who works in the Davis/Sacramento CA area.  He was extremely pleasant and overall very helpful.

Don checked the signal coming in to the house and downstream was as high as 1600 Mbps!

Don mentioned that my cable modem is "no longer supported" for my current internet tier.  I was initially very confused why my modem used to allow me to achieve over a Gig hardwired, but after "upgrades to the network" would now only achieve around 900 Mbps.  I'm sorry but I do not understand how this makes any sense.  This modem is specifically designed to take advantage of multi-gigabit speeds.  Again the only reason why I decided on this specific modem was because it was stated as being supported for my current internet tier (at the time of purchase) and takes advantage of link aggregation.  WHY would Xfinity all of a sudden not support a modem for this tier that uses link aggregation?  The MB8600 is designed to be "future proof."

Don mentioned the my device info link through Xfinity.  There are about 10 devices shown which support my current internet tier.  And guess what?  NONE of the cable modems that are "supported" have link aggregation.  It DOES NOT MATTER if they have a 2.5 gig port (as described at the beginning of the post - this will not allow you to achieve Gig+ WIRED speeds).  

So I am stuck with a modem now that USED to give me Gig+ wired speeds, but now because of "network upgrades" I can no longer achieve those speeds??

Some help or suggestions would be greatly appreciated.  I would rather not spend several hundred more dollars on new equipment when my current equipment should be sufficient. 

jlavaseur

Problem Solver

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694 Messages

2 d ago

I have that router, try dual wan mode…

Visitor

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2 Messages

@jlavaseur​ Dual WAN mode would not achieve the desired result I am looking for.  You must not have read my full post.  

jlavaseur

Problem Solver

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694 Messages

Well I read your post, I have achieved 1400 Mbps WiFi and wired with thst router, you can configure the wan or lan port to be 2.5 gig but not both simultaneously, so if configured correctly, 2 1000 Mbps ports going in and using the 2.5 port coming out should achieve the desired results with the mb 8600  + rt-ax86u, using the dual wan mode….

(edited)

Official Employee

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143 Messages

Hello @Cameron0390  thank you for reaching out through our forum. Could you please send our team a direct message with your full name and full address? Our team can most definitely take a further look at this issue.

To send a "Direct Message" to Xfinity Support:

Click "Sign In" if necessary

Click the "Direct Messaging" icon or https://comca.st/3EqVMu7

Click the "New message" (pencil and paper) icon

The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there

 - As you are typing a drop-down list appears. Select "Xfinity Support" from that list

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Type your message in the text area near the bottom of the window

Press Enter to send it

 

See https://comca.st/3KQF8q9 for an example.

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MikeMikeM

Contributor

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61 Messages

1 d ago

Do I understand correctly

  1. your PC has a 2.5 GbE port, which is connected to your router's 2.5 GbE LAN port
  2. you paired two 1 GbE router ports to your modem's 1 GbE ports, and enabled Link Aggregation (LAG) for that pair.

Based on my understanding of Link Aggregation,  IEEE 802.3ad and 802.1AX and LACP specs,

none which I have ever seen first-hand,

but instead can only glean unofficial recitals from online sources,  (like Wikipedia),

Link Aggregation cannot boost any individual PC's downloads faster than the router-modem individual ports' capabilities.

1 Gbps in this case.

The reason is, the traffic from any one PC will go through only one of the router's Aggregated WAN ports.

that caps each single PC 's top download speed to 1 Gbps in this case.

The purpose of Link Aggregation is only for Load Balancing and Failover.

If you have two or more PCs connected through your router, possibly collectively they might be able to draw up to 2 Gbps through the Aggregated pair of 1 GbE ports to the modem.

But to emphasize, no one PC connected to the router would be able to exceed 1 Gbps internet downloads.

That's my understanding of how Link Aggregation works.

So I'm puzzled when both you and the other replier here report you ever surpassed 1 Gbps downloads.

you got greater than 1 Gbps download ratings from speedtest.xfinity.com ?

(edited)

jlavaseur

Problem Solver

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694 Messages

1 d ago

I used the dual wan mode, it worked so I didn’t experiment further, tho link aggression should  achieve similar results, roughly 1400 Mbps WiFi and wired from my rt-ax86u if configured correctly, of course your equipment must be able to utilize speeds above 1 gig or your capped at 1 gig, my equipment can utilize up to 2.5 gig, tho Comcast only provides roughly 1400 Mbps to me, so I am capped at that..

(edited)

MikeMikeM

Contributor

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61 Messages

@jlavaseur​ 

I think you're saying you connected your router to the modem via 2.5 GbE port.

also, that benchmark output isn't from speedtest.xfinity.com.  no?

how about posting the measurement we'd all be familiar with, instead.

jlavaseur

Problem Solver

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694 Messages

Modem to the router via 2 1000 Mbps Ethernet cables, 2.5 gig lan out port, personally I don’t use any xfinity stuff because I find it inaccurate and crashes on me, I use speedtest.net

MikeMikeM

Contributor

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61 Messages

@jlavaseur​ 

there might be a reason it crashes...

jlavaseur

Problem Solver

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694 Messages

I am sure there is, I changed modems, the website listed my old gateway as my current modem for months after the activation of my new modem, yet everything worked perfectly, I would get messages they could not reach my gateway, I am assuming because it’s in a box in the basement, unplugged and  disconnected, my xfinity cell phone I had to upgrade my plan to utilize 5g, the website said it would take a hour, 2 years later it still has the same message, yet again everything works perfectly, so I don’t bother with anything related to a xfinity website… don’t get me wrong I am extremely satisfied with Comcast/Xfinity, I been a customer since approximately 1991 for a reason…

(edited)

MikeMikeM

Contributor

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61 Messages

@jlavaseur​ 

this is getting very confusing to follow.

are you connected through a MB8600 modem?

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