Netgear CG3000D-100NAS DOCSIS 3.0 Cable Modem Router Review

I get my internet service through my local cable provider, Time Warner cable of Southern California. Up until a couple of weeks ago, I was leasing a modem from them for a nominal price. It was a no frills basic modem that gathered dust under my desk for over a year. I often forgot it was there except for the occasional contact with my left foot. I was happy with the setup in that my connection never dropped unlike the DSL service I had from AT&T, and Time Warner was happy to nickle and dime me. However, a few weeks ago they decided to double my lease fee with no explanation or justification. I wasn’t happy. Unlike my car, the modem did not require any sort of scheduled maintenance, say an oil change or alignment. The fee they were charging was unacceptable. One could buy the exact ancient modem on eBay for two months’ lease fee. So my search began for a basic cable modem to replace the cheapo one from Time Warner.

While conducting my search I stumbled across Netgear CG3000D-100NAS Cable Modem Router on It had loads of features and the best of it all it was less than $25.00 with free shipping. The fact that it had a built in wireless router and gigabit switch meant that I could use it to replace both my modem and the router; less clutter under my desk and hopefully less electricity.

The reviews for the modem were mixed on However, Amazon has an exceptional return policy; if I was not happy with the modem I could simply return it back to them. I placed the order, selected same and the modem was delivered to my house around 8PM that evening. It came in a non-retail packing with a power adapter and LAN cable.


Main Features

DOCSIS 3.0 Frankly, this does not mean much to me. My subscription with cable company is 15 Mbits downstream and 1.5 up stream. So, I know that any of DOCSIS version starting with 1.0 well suppresses the speed limits imposed on me. If you like to kill some time here is the wiki article.
Wireless access -Supports up to 300Mbps (802.11n)
-‘N’ connect WPS setup: never used this feature on any of my routers. However, if you care, it is there.
Gigabit LAN Four LAN ports that support 10/100/1000 Mbps speeds
USB 3.0 port I have not been able to get this to work.

Initial Setup

The initial setup was a breeze. Connected all my devices and the coaxial cable to the router; powered it up and opened a browser window on my desktop computer. That immediately brought me to Time Warner modem activation page ( I tried going through the regular activation process by following the instruction on the web site. However, at the end I was informed that my modem could not be activated and that I should either call them or chat with one of their technicians on line. Of course, I opted for the latter option.

Once the tech came online, he asked me for my Time Warner customer number, DOCSIS version and the MAC ID of the modem and finally whether the modem was a lease or a purchase. After several minutes, my modem was activated and I was happily surfing. So far, so good.

Tweaking it

About an hour fast forward and the whole experience turned sour. The modem kept dropping the connection and it would take several minutes for it to come back. I searched through the Amazon reviews for a solution with no luck. As I was looking through the router’s log files, I noticed repeated DOS attack entries originating from my PCs. This was odd because I knew for a fact that all my PCs were clean. I suspected that the router’s firewall was mistakenly identifying multiple simultaneous requests coming from my PCs as DOS attacks. I figured I needed to tweak these settings on the router.

However, there was no such entry on the router’s default web page to change firewall settings. A little bit of Googling revealed that this router has two different levels of login: administrative and superuser. In order to change the firewall settings one must log in as the superuser using the default credentials user: ‘MSO’ password: ‘changeme’. The superuser login reveals a new heading titled “Content Filtering” which is not visible under the administrative login using the default credntials user: ‘admin’ password: ‘pass’.

Once there, I went to “Services’ link and disabled ‘IP Flood Detection’ and rebooted the modem. Since then all my connection issues have been resolved.

I highly recommend that you also disable ‘Remote Management’ option on this router. It will provide you with one more layer of added security against intrusions from the internet.

Superuser login reveals a new entry on the admin menu. Superuser login reveals a new entry on the admin menu.


It is well worth the $25.00 I spent on this router. You can barely buy a modem for that price. Highly recommend it.


Things I have discovered in the last week or so.

Apparently, under DOCSIS specification, your cable provider has absolute control over your cable modem’s firmware. That is, they can push a new firmware and change settings on your modem at will.

The second thing I learnt over the past week is that, the wireless functionality on this cable modem is pretty much worthless. The strength of the wireless signal and the signal itself fluctuates, often completely disappearing off the radar. So much so that I couldn’t take it anymore and plugged in my old D-Link DIR-615 router into one of the LAN ports on the modem and started using that for wireless access. I continue to use the gigabit switch on the modem as the DIR-615 lacks that future.

However, I would still recommend this modem as you still get a functioning DOCSIS 3.0 modem with gigabit switch, all for around $25 .

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