Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

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I Plan to Stick Around
Posts: 35

Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

Setup:

Rogers Technicolor CGM4140COM in bridge mode

Ubiquiti EdgeRouter Lite (ERL-3) router behind it

Kanata (Ottawa), ON

1 gigabit/30 megabit package + Ignite TV channels

 

Speedtest:

946 down/31 up, no issues

 

Issue:

Once every 1 to 1.5 weeks the speed doesn't exceed (any speedtest, consistently) 650-680 megabit down.

 

Complete power off to both cable modem and router for 5 min - no impact, still (!) 650-680 megabit down when all powered up and running.

Router restart - no impact.

Cable modem restart - no impact.

 

Troubleshooting (the weird part):

Change the cable modem from bridge to gateway mode (90 sec).

Restart the cable modem (3-4 min).

Change the cable modem back from gateway to bridge mode (90 sec).

 

Speed test - back to 946/31:-).

 

The best uneducated explanation I can think of is the cable modem "syncs up" with Rogers' servers at a lower speed for some reason, the power off/on doesn't change that synced up speed, but this bridge-->gateway-->restart-->bridge sequence somehow forces to re-negotiate the speed back to the maximum 946 down.

 

No idea what to do about it, and even if anything can be done about it...

 

***EDITED LABELS***

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Resident Expert
Resident Expert
Posts: 1,271

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

@NorthGraves  This exact same problem has been previously reported by another user.  Trying to find that post now...



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Resident Expert
Resident Expert
Posts: 1,271

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

Found it!  @KoN1  reported the same problem here: https://communityforums.rogers.com/t5/Ignite-TV/Using-the-Ignite-TV-Modem-Gateway-in-Bridge-Mode/m-p...

 

You also both happen to be using Ubiquiti routers that run EdgeOS.  When your Internet suddenly slows down, what happens if you were to unplug your router, then connect a computer to the XB6 while it is still in bridge mode and perform a speed test?  Do you see the same results?



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I Plan to Stick Around
Posts: 16

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

I have this exact same issue running ubiquiti routers and the technicolor in bridge mode. 

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I Plan to Stick Around
Posts: 35

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

Thanks, interesting, I will try, but what is inexplicable to me is why a complete power off of both devices doesn't change anything....but this weird sequence on the cable modem does...

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Resident Expert
Resident Expert
Posts: 1,271

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)


@NorthGraves wrote:

Thanks, interesting, I will try, but what is inexplicable to me is why a complete power off of both devices doesn't change anything....but this weird sequence on the cable modem does...


I have no idea what's going on here or what could be causing the slowdown.  All speed tests have been performed through the Ubiquiti router.  Since power-cycling the XB6 does not fix the problem, it may or may not be at fault.  That's why I thought it would be interesting to perform a direct speed test while the XB6 is in a possibly bad state.

 

Another thing that happens (from the router's perspective) when changing the XB6 from gateway to bridge mode is that the addressing on the WAN interface changes from 10.0.0.0/24 to a public IP address.  I don't see why that should change anything on either the XB6 or the router... unless the router has QoS enabled and/or is doing some rate limiting in which case, changing the IP addressing on the interface may cause it to reset its local state.



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I Plan to Stick Around
Posts: 16

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

The thing is I was getting gigabit speeds with CODA Modem. I have hardware offloading enabled and QoS disable (Ubiquiti Features) and the max speed I get is 600 Mbps when bridging the technicolor modem. 

 

Can anyone from Rogers speak on this? 

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Product Manager
Product Manager
Posts: 21

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

We're able to replicate this in the lab with a direct connection in bridge mode after a reboot and have escalated to the vendor. We haven't received any updates yet but we can share as they become available. 

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Product Manager
Product Manager
Posts: 21

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

We've received a build that includes a BCM fix for this issue and we're testing it now. I'll update this thread once it's been validated. 

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Resident Expert
Resident Expert
Posts: 1,271

Re: Strange recurring issue with Rogers Technicolor CGM4140COM (Ignite 1 gigabit)

@RogersGordon  Thanks very much to you and to the team for confirming the bug and for keeping us up to date on progress towards a fix.  We really appreciate it!