Cable modem latency issues

[Mrs_Esterhouse]

Hi All,

I have a strange issue that I'm curious to hear if anyone else has had or might have experience with.

I used to have a Zoom 5370 DOCSIS 3.0 cable modem on Comcast Business Internet 200. Pings from my wired LAN machines to the Zoom (192.168.100.1) were always 1ms, and pings to 8.8.8.8 were always 7-8ms from all machines. The modem totally died one day, so I replaced it with a Netgear CM1000v2 DOCSIS 3.1 modem. I kept the router the same, which was an Asus RT-AC66U B1. I had to add a WAN static route into my Asus to reach 192.168.100.1 on the Netgear. Pings to 192.168.100.1 jumped to 4ms, and pings to 8.8.8.8 jumped to 11ms. A few months went by and I upgraded my aging and NVRAM limited Asus RT-AC66U B1 to a Asus RT-AX86U Pro. The higher pings remained the same, so the culprit is likely the modem. The higher pings existed even when pinging from both router's GUIs to 192.168.100.1.

Is the Netgear modem crap, or is this a DOCSIS 3.1 problem? The Netgerar is very stable and returns great line stats with zero errors for months, but it has caused latency to jump by about 4ms to everywhere, even itself. Here are the line stats:

Any ideas as to why the latency went up with the newer modem? I looked at swapping the Netgear for a Motorola MB8600 but read a couple of reviews by people that said they were also getting the same 4ms ping jump to 192.168.100.1.

 

[Mrs_Esterhouse]

I did notice on Comcast's page that the CM1000v2 is only supported in the 500MB speed tier, and the CM1000 is supported in most speed tiers. Maybe my CM1000v2 is provisioned with CM1000 Comcast firmware and that's causing the ping issue?

Supported modems:

Article | Comcast Business Support

 

[RMinNJ]

I dont have comcast and I have an arris router but if I ping my modem 192.168.100.1 through my asus router over 5g wireless no less.. i get 3 to 4 ms.

Maybe try connecting a laptop directly to the modem and try your 192.168.100.1
ping ? Also change the cable to a good 5e or cat 6 between the modem and router...just because your old modem liked that cable doesnt mean the new one does...though that would affect speed rather than latency? I would try an Arris 8200 or S33.. but again I dont have comcast.

 

[Mrs_Esterhouse]

I dont have comcast and I have an arris router but if I ping my modem 192.168.100.1 through my asus router over 5g wireless no less.. i get 3 to 4 ms.

Maybe try connecting a laptop directly to the modem and try your 192.168.100.1
ping ? Also change the cable to a good 5e or cat 6 between the modem and router...just because your old modem liked that cable doesnt mean the new one does...though that would affect speed rather than latency? I would try an Arris 8200 or S33.. but again I dont have comcast.

Sorry, I forgot to mention that I also connected a laptop directly to the modem via Ethernet and had the same 4ms ping to 192.168.100.1.