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Forum Discussion
CM1150V LACP LAGG Firmware Issue - Comcast V2.02.04 and V2.02.03
Anyone else notice issues with the Netgear CM1150V running on Comcast with the V2.02.x firmware? Particularlly with LACP/LAGG (IEEE 802.3ad) Ethernet Port Aggregation Enabled?
I have noticed this since this feature was introduced...
If I have LACP/LAGG enabled in the advanced settings on the router connected to my Firewall (OPNSense Virtual Applicance with Intel I350 NIC) all will be fine for a while. Then a few hours later (not sure exact amount) the internet speed will DRAMATICALLY drop for download. Upload is not affected.
So I will have 950Mbps Down by 45Mbps Up on Comcast DOCSIS 3.1 Gigabit service on immediate power up of the modem, then half way through the day the download will drop to around 25-30Mbps and the upload will remain higher than the download around its 45Mbps mark.
This is reproduceable everytime... I even went as far to buy a Motorola SB8200 for testing (but doesn't support voice) and enabled LACP - works fine for the week of testing at full speed with LACP without issue (Firewall config not touched in anyway). Also on the Netgear CM1150V if you disable Ethernet Port Aggregation the speeds will remain at their high 950Mbps or so mark. So their is a bug in Netgears LACP firmware implementation on this Modem which needs to be addressed.
74 Replies
Is your firewall LAG supporting and you have it enabled and connected using both LAN ports for LAG with the modem?
Others are seeing similar issues:
- Yes- everything is configured correctly in terms of LACP/LAGG and using both ports. As I mentioned, the Motorola modem didn't have this issue with same configuration. It most likely isn't on the firewall end of things.
Comcast discussion thread link, found another user with same issue with same modem and firmware:
https://forums.xfinity.com/t5/Your-Home-Network/Netgear-CM1150V-Extreme-Slow-Downs/td-p/3255727I believe NG is aware of this issue. Something to contact them about if you feel the need. No idea if or when it will be fixed.
we are aware of this issue and are testing a fix with a a tester. So far the result is positive.
We will plan to send the Firmware to Comcast for certification once our testing is testing is complete.
current workaround is to run without LAG enabled.
- Can I get the beta firmware to test also? Feel free to message me, if yes.
- Thanks for the info. Can you post when the new Comcast firmware is available? I’ve had the modem unhooked in favor of my Motorola MB8600 since this happened.
FW will be sent to your ISP then pushed from there. I would contact your ISP and ask them if they have any information from NG regarding this issue. Cable modem FW will only be sent to ISPs first so they can test and make sure it works on there network.
YoungSpicket wrote:
Thanks for the info. Can you post when the new Comcast firmware is available? I’ve had the modem unhooked in favor of my Motorola MB8600 since this happened.
Any updates on an ETA for this? I'd be happy to help test out on Comcast if possible.
Netgear, can you confirm you have sent the new firmware with the bug fix to Xfinity/Comcast?
- They already confirmed and apparently Xfinity Comcast is sitting with the firmware but haven't pushed it out to their customers.
- I Cooke with David from Comcast support in New Hampshire today. He escalated it to xfinity national who gets the new firmware. He was in contact with regional tier two support and the did read this article and the xfinity forum on page one of this forum. They will try and get the firmware update released. They did tell me to force a push simply unplug modem for 30 seconds and plug back in and it will check for new firmware. I will keep everyone posted if I make any progress but if more people call I would assume it would help to make them aware there are more people with the same issue.
ThePiston450 wrote:
I Cooke with David from Comcast support in New Hampshire today. He escalated it to xfinity national who gets the new firmware. He was in contact with regional tier two support and the did read this article and the xfinity forum on page one of this forum. They will try and get the firmware update released. They did tell me to force a push simply unplug modem for 30 seconds and plug back in and it will check for new firmware. I will keep everyone posted if I make any progress but if more people call I would assume it would help to make them aware there are more people with the same issue.I would keep on them about this, they have already been sitting on the firmware with the fix for a couple months now.
Just opened up support ticket with netgear.
Case #41993230
the cm1150 i purchased is advertised as multi-gig and the first feature listed is "
- Ideal for Gigabit cable Internet plan. Delivers true Multi-Gig Internet speeds with link aggregation** support.
https://www.netgear.com/home/products/networking/cable-modems-routers/CM1150V.aspx
Netgear please address this issue.
I'm also noticing this issue. It's easy enough to disable LAGG, but Xfinity overprovisions the gig plan to ~1200Mbps (and yes, I am able to pull that pretty easily in my neighborhood).
Still waiting for the firmware update to be sent out. It is unaccepable that NetGear has fixed this, however Comcast/xfinity has not pushed out the firmware upgrade.
The resolution to this is not to move to another cable-modem, however to leave Comcast.
If Comcast doesn't want to support me, there are other providers which will.
It is also up to NetGear to put pressure on Comcast to push this out. So maybe it is a good idea to leave NetGear.
- Any update on new firmware for the CM1150V? I see from another thread the CM1200 has received new firmware with this issue resolved.
I'm having the same issue here, still v2.02.04 of course. Ended up disabling LACP on both sides, we'll see how that goes.
I had contacted Netgear for a warranty replacement, since I was having the issue since the beginning, and have tested/swapped literally everything between the tap block (on the pole - Comcast tech even ran a new drop from the tap) and the computers (wiring, new runs, etc.) I came to the conclusion that it's either an issue with the modem itself, or something upstream from the tap block on Comcast's infrastructure. When I got the replacement modem, I remember pretty specifically not enabling LACP on the replacement, but still had the slowdown - it did take a few days before the first time it occurred, but now it's back to <24 hours.
For those suggesting other modem models, please remember that some of us actually do need the voice ports. I actually have two active landlines (one for me, one for my mother-in-law), so a non-voice modem isn't an option.
So I was also having issues with the V2.02.04 firmware that Comcast pushed to my modem when I first installed it. I was running through an RAX80 at the time and every 4-6 hours DL would drop to 40Mbps and UL would stay at 40 Mbps. I had the techs here and they said all is good with the signal strength and modem behavior as far as they could tell.
I was waiting for a firmware patch like everyone else. I ended up swapping the router out to the RAX120 since it has more wireless streams for my multi-tasking gamer kids and a Multigig port to connect to my SX10 switch. I am almost certain it is coincidental but ever since I put the new router into the network setup I have been just under DL 1200 Mbps without needing to power cycle the modem every 4-6 hours. When I check the modem it now says firmware V4.02.02. Has anyone else seen this version firmware pushed to their modem by Comcast?
Just for reference my RAX120 router firmware is V1.0.0.78.
HypaspazzLooks like I'm still on v2.02.04 myself. I did disable LACP (on both sides of course - the modem and my router [a Dell PowerEdge server running Netgate pfsense]), and that resolved it for me - I have not had reduced bandwidth ever since, and it's been at least a couple weeks since I last rebooted the modem.
