WAN Aggregation / Link Aggregation (Arris T25 Modem/ASUS Router)

There was a previous question that was closed of course before it's time.

I have an Arris T25 dual LAN Port modem. I have an ASUS GT-AC5300 the supports Link aggregation and Duel Wan. I have internet speed with Comcast at 1200 mbps ... I have all the hardware and service from Comcast to support maxium speed.

The problem is no matter what I do, I cannot get an internet connection from my T25 when I used both ports from the modem to my router.

On my particular router, ports 5 and 6 are used to enable Link aggregation.

You would think, all I need to do is have two cat 8 cables (yes, using cat 8), connect them to the router ports 5 and 6, and turn on link aggregation on the modem and router in settings. When I do that, I get no internet coming from the T25.

These are my settings:

T25 Modem:

On My Asus router (GT-AC5300), I would turn on the following parameters:

Problem is, when I do this, there is no internet connection from the modem. A red light flashes on the router indicating such, and of course any device attached to the router has not internet. It's as if the modem does not use both ports and renders one useless.

There is a Dual WAN setting on the router also. If I do that, no difference ... that is, turning it on.

Does anyone have ANY ideas what needs to be done, in a very detailed manner what process needs to be followed to allow duel use of the ports from the T25. Please be specific as possible with whether port 1 needs to go to router 5, second modem port to router 6 etc. and the settings.

All I want to get is a hard wired internet connection to my PC that takes advantage of the Comcast service I am paying for.

Thanks

Eric

Responses

Accepted Solution

Jlavaseur

Problem Solver

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948 Messages

3 years ago

Well you need a multi gig router, one thst supports 2.5 g, your router has 8 gigabit ports, so you will never achieve over that, I have done it with the Xb7 rented gateway before, but you need one to supply 2 gigabit connections to the multi gig router, I have found success using the dual wan method, your pc network card will need to support over a gigabit also

(edited)

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EricInPDX

Contributor

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26 Messages

@jlavaseur makes perfect sense ...

I see probably need the Netgear modem as suggested by Brie and Mary and the router you suggested - along with hardware you also suggested that has gigabit network cards. Problem is that I shelled out close to $500 on the new modem and router the past month and already they are too old and can't be returned. C'est la vie.

Thanks for the info.

3 years ago

Jlavaseur

Problem Solver

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948 Messages

if you bought them with a credit card, you might have some options, my one credit card doubles the warranty plus other perks, worth a look in my opinion

3 years ago

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EricInPDX

Contributor

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26 Messages

3 years ago

I am seeing comments on the retailers website where I bought this that although the T25 allows both ports to be used (with a router that support Link aggregation), that Comcast itself disables the second port through their firmware update.

Can someone from Comcast please definitively answer whether on the T25 Comcast disables the second port and does NOT ALLOW link aggregation to be used? If so, wondering why I'm bothering to pay for Gigabit internet.

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EricInPDX

Contributor

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26 Messages

3 years ago

As part of the service that Comcast/Xfinity offers, you need to get a telephone bundle with Comcast. There are only a few modems offered that support the networked phone, and the Arris T25 is one of them.

But trying to get Comcast to respond here, or even attempt to answer a simple question is like pulling teeth.

I wonder why I bothered to waste $500 buying a new modem, router, cables and service with Comcast when the provider of the service on their OWN website does not bother to respond. Thanks a lot Comcast .... it makes me want to do business with you for years to come ....

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EricInPDX

Contributor

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26 Messages

3 years ago

Thanks. I want to know how you can ask someone at Comcast to respond to a post here.

Note: This comment was created from a merged conversation originally titled How does one get someone from Comcast to respond to a post with a direct question?

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BruceW

Gold Problem Solver

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26K Messages

3 years ago

Have you tried using Cat 6 or even Cat 5e cables? Some Internet sources suggest that Cat 8 may not be compatible with 1 Gbit and 2.5 Gbit ports.

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EricInPDX

Contributor

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26 Messages

@BruceW

Not sure why you are suggesting Cat 8 would NOT be compatible with Gigabit and more ports since Cat 8 was made expressly for that purpose.

Yes, I used Cat 6 cables initially just to setup the mode/router. Whatever I do with the modem, as long as I have two cables plugged into the port, no internet signal goes through it. The modem itself (the T25 modem) flashes green on the two ports, so it "knows" there is two cables.

I wish someone from Comcast would respond and indicate whether or not they expressly turn off one of the ports with their configuration. Isn't this forum supposed to be monitored by Comcast so they can chime in where appropriate? I have invested a lot in new hardware, time and frustration but the silence from anyone from Comcast is disturbing.

3 years ago

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XfinityMary

Official Employee

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271 Messages

3 years ago

Hi there @EricInPDX! I appreciate you posting your concerns with your internet connection and modem configuration. I know it is important to get the most our of your service and connection. A few concerns that I thought I would address today to help you with your connection. Since we increased our internet speeds, the Arris T25 modem is no longer compatible with our Gigabit internet tier, which now provides download speeds up to 1.2 Gbps. To review a list of compatible modems, check out https://comca.st/2VYlNiP and input your address and speed tier into the requested spots.

Secondly, there are a few ports that Comcast does indeed block. For details, here is a link that contains all the blocked internet ports: https://comca.st/3gbwvta. I hope these details help with the connection concerns you are having today!

*EDITED TO MAKE LINKS ACTIVE*

(edited)

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EricInPDX

Contributor

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26 Messages

@XfinityMary Mary, I see there is now a modem with Telephony that supports 1.2 GB internet speed ... when I bought the T25 3 weeks ago this was the fastest Telephony modem supported by Comcast. It has 2 1GB ports (TWO of them). One of the ports appears disabled.

I am talking about the Network hardware ports on the modem itself, not IP ports that you sent in your link.

(edited)

3 years ago

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XfinityBrie

Administrator

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663 Messages

@EricInPDX currently it appears the Netgear CM2050V has support for speeds up to and over 1.2Gbps on our network, and has telephony features built in.

Netgear CM2050V | Model number: CM2050V

Device Type: EMTA

Wired Download Speed: Up to 2.33Gbps

Voice/Telephone enabled: Yes

Built-in WiFi: No

DOCSIS Channels: 32 down x 8 up

DOCSIS Version: DOCSIS 3.1

IPv6: Yes

Alternatively, and this is popular with some at-home set-ups, you can have an EMTA only for the telephony service and Modem for the internet service (either with router built-in or separate). Customers are allowed up to 1 device per line-of-business.

The other compatible modems for speeds up to and over 1.2Gbps are: Arris S33, the Motorola MB8611, Netgear CM2000, and Netgear CAX80.

Their specs are available here: Approved Third-Party Devices - Support Page

For additional details on each device, please consult the manufacturer.

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3 years ago

0

Jlavaseur

Problem Solver

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948 Messages

3 years ago

So, your router has 8 gigabit Ethernet ports, plus no WiFi 6, wrong router for what your trying to do, I use the asus rt-ax86u, I get roughly 1450+ use the dual wan mode

https://www.pcmag.com/reviews/asus-rog-rapture-gt-ac5300

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EricInPDX

Contributor

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26 Messages

@jlavaseur Ports 5 and 6 on the Asus AC5300 are reserved for using Link Aggregation.

The problem does not appear with my actual router ... it's the fact that the T25 itself has the second port not able to send a signal ... at least from my observance.

What actual modem do you use to your router? I need to use the T25 because I have Comcast phone service (Telephony).

I guess I should have bought the AX86U.

3 years ago

0

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EricInPDX

WAN Aggregation / Link Aggregation (Arris T25 Modem/ASUS Router)

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