Cable Modem Connection

[Rule Uresti]

I have had the same problem with my Netgear CM600 modem on Comcast in the past with my Surf Soho running older firmware. A Balance One Core has replaced the Surf and if my memory serves, I have also experienced the Connecting problem with it.

I suspect this is a problem with the Peplink handshake with the CM600 modem because when I unplug the Ethernet cable between the two and reconnect, the problem goes away. It also goes away if I power cycle the Balance One.

I welcome other comments on a problem that seems so bizarre that I previously elected not to mention it, but do now in case it helps shed any light on the Connecting problem. (The 34Mbps state also occurs occasionally when I have not power cycled the modem and I am on a UPS.)

We did receive a few similar cases. We are working with the partner/customer to investigate it. Based on the current finding, the same symptom can be found. We failed to get a DHCP Reply from the ISP when the problem is occurring. We also see there is a lot of IPv6 ICMP packets sent from the ISP. So, this shows that the WAN link is up but not sure the reason the ISP is ignoring our DHCP Request. You may do Network Capture from the support.cgi page - -bin/MANGA/support.cgi to confirm whether you are seeing the same symptom.

@Mark9: I suggest looking at the Ethernet stats on the support.cgi page. It will also show the speed of the WAN port. And, check the event log on the modem. It really helps to be somewhat familiar with the modem operation, both checking the active channels up/down and the log. Understanding the modem log is beyond me, but you may find a message that only happens when things slow down.

Since you are on a UPS and the slow speed happens sometimes out of the blue, the modem is a bigger suspect than the router. By the way, the best UPSs are line interactive. The standby ones are cheaper but not nearly as good. Think load balancing vs. failover.

If its the router causing the slowdown, look at the load balancing setting, even if you have only one WAN connection. Ten percent might be an issue with load balancing and the router may be doing it on purpose. Also, for the WAN connection properties, check that the router knows to expect 300Mbps.

@TK_Liew Ticket 21070899 has been opened for this. It has two diag reports with network traces. Unfortunately the first was done after the problem happened, so not sure if that is helpful. The second was started with the modem powered off, but it shows a normal working connection after the modem was powered on. Hopefully that can be of some use. Intermittent problems are the worst.

I am beginning to wonder if this is possibly a Comcast node congestion policy as I was unable to reproduce my slowdown problem last night when power cycling my CM600 modem. As I have noticed it most often on Sunday evenings (video streaming in the neighborhood?), maybe I will experience it again by then.

However, the CMTS has its own Max-CPE count. As best as I can tell, it is not reset when reloading the DOCSIS config file to the CM during a quick modem power cycle, leaving the CMTS count at 1 while the CM is zero. Apparently powering down the cable modem for about 10 minutes did take care of reducing the CMTS Max-CPE count to zero, thus finally resulting in a DHCP response to your 20x.

Learn the essentials of how cable modems work, plus what modem features and terminology to look for when outfitting your office or changing your internet service provider (ISP_ to save yourself from serious headaches down the line.

Cable modems are a prevalent type of hardware that connects computer devices with your ISP. Differing from other types of modems, a cable modem uses coax cable, the same infrastructure that brings television programming to our business or homes, to proxy that connection, rather than a telephone or DSL line.

This delivery ecosystem requires national cable providers or operators to set up regional and even neighborhood hubs to transfer cable-line-based data. Within those hubs, people evenly split bandwidth, with those cable operators imposing data limits to ensure no single user (including businesses) siphons too much bandwidth. With the wide adoption growth of the technology, cable providers have elected to segment their residential and business customers, so while the platform is still shared, business traffic is isolated from the residential neighbors. Business services will also include a higher tier SLA (service level agreement) that assures an accelerated response and priority to disruptions or service outages.

In fact, only cable modems and other network infrastructure can increase what we perceive as internet speed. How does a modem work, and what are the effects on your internet speed? These speeds are relayed in a transmission measurement known as the Data Over Cable Service Interface Specification standard, or DOCSIS for short. Every cable modem comes with a DOCSIS speed, and these speeds vary widely across modem models. Typical download speeds for older DOCSIS modem models (e.g., DOCSIS 1, 1.1 and 2) average 30-100 Mbps, while the most advanced models transmit between 1 to 10 gigabit per second (Gbps) uploads.

Business cable modems are an essential piece of hardware for functioning internet and data communications systems. Finding a unit with the right capabilities is crucial to unlocking full communication capabilities, including:

If your business wants to use a Wi-Fi network, you will also need a router. The router connects your wired and wireless devices to the Wi-Fi network, so all your devices can use the internet at once. Routing the data between your devices creates your business network. Routers also allow devices to communicate without using the internet. Router features include:

Many internet providers advertise packages according to their max download speeds (in Mbps). Typical download speeds depend on your service provider, geographic location, hardware condition, package tier type and other variables.

Higher Mbps is not always better. Business owners should consider the actual internet usage of their employee user group before selecting a premium bandwidth package, categorizing the actual applications its staff uses the internet for.

Like older DOCSIS modems, older firewall technology might not keep up with your upgraded cable speeds, lacking the RAM, CPU and other features required to do so. Make the most of your new coax service by considering upgrades to your firewalls and other similar network defenses alongside your selection of your Internet service plan to realize the most capability from your new Interner service.

My RBR750 WiFi mesh network with one satellite was working well until last night. This morning the router was not able to connect to the cable modem. I have checked the cable modem and the modem is working fine. Have unplugged the modem and plugged it back in at least three times. But that does not fix the problem. At this time I am have run out of ideas. Requesting help from the community.

Solved. It reading other messages in the post. To debug the set-up I had a computer connected to my cable modem. ISP provides only one public IP address as mentioned in a previous post. Thus the router was not connecting to cable modem.

Ya most ISP only allow 1 WAN IP address on modems. If they have multi WAN ports, most of these are disabled or auto detected when connecting up devices and only 1 port would get the IP address from the ISP.

Glad you figured it out. Be sure to save off a back up configuration to file for safe keeping. Saves time if a reset is needed.
-do-I-back-up-the-configuration-settings-on-my-Orbi-WiFi-System
Enjoy.

@amscrey what WAN configuration does your ISP Spectrum provide and how is the WAN port on the ER605 currently configured? For a cable modem/ISP, I think it's most common to use DHCP and have the "Dynamic IP" connection type configured in the ER605.

"what WAN configuration does your ISP Spectrum provide and how is the WAN port on the ER605 currently configured? For a cable modem/ISP, I think it's most common to use DHCP and have the "Dynamic IP" connection type configured in the ER605."

Yes, I think you are right about getting IP's from cable ISP's via DHCP using Dynamic IP mode. I have/had configured both routers mentioned using "Dynamic IP" connection modes available in each routers WAN admin.

You are correct - the TC8715D does have router capability and according to the sticker on the bottom it presents its admin on 192.168.0.1. I think Spectrum charges for providing a router (at least sometimes) and I have never opted to pay for that service. I think they have the device configured so the routing capability is turned down. I have not been able to access the admin interface for the device by connecting a laptop directly. I never see anything rendered when visiting 192.168.0.1.

I did try changing the LAN IP and subnet used by the TP-Link router - but did not have any luck when trying that. I tried changing the TP-LInk's IP to 192.168.2.1 thinking I would avoid the confusion/collision of administering TP-LInk ER605 and Modem using the same address (in the case the modem's admin/routing was ever enabled) and also thinking I would use the 192.168.2.xxx subnet to avoid collision with the Linksys 192.168.1.xxx subnet for this temporary period while I still am using that as a router.

The LAN config changes seemed to get applied at first. The admin interface reset/disconnected (as I was connected via 192.168.0.1) but I was never able to connect to the admin interface on the new address (I expected to connect on 192.168.2.1) and I did not seem to have internet connectivity after making that change. I think I tried reboot the TP-Link again alone but I don't think I tried reboot both the modem and TP-Link. Maybe I need to try this again

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