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Forum Discussion
Ethernet connection issues CM1150V
Just purchased modem CM1150V, using OSX, Xfinity internet; in the past with other cable modems, I have always used a direct ethernet connection to my Mac through one ethernet port, and then connected my router from a second ethernet port. Netgear customer support said that I can not use that setup with this modem--I can either have the direct connection to the computer OR the connection to the router, but not both. Is this correct? This is the first time I have ever not been able to have both the computer connected directly by ethernet, and the router connected via a second port.
41 Replies
> [...] in the past with other cable modems, [...]
Such as? "other cable modems" is not a very detailed description of
anything. (Probably not very accurate, either.)If your old "cable modems" were actually modem+router combination
units, then that could explain the difference. A Netgear CMxxxx is a
modem only, not a modem+router. Typical residential Internet service
allows you one public IP address, hence one device connected to the
modem. If you want more devices, then you add a NAT router, connect the
router to he modem, and connect the devices to the router.> [...] This is the first time I have ever not been able to have both
> the computer connected directly by ethernet, and the router connected
> via a second port."via a second port" on _what_, exactly?
What is your "the router"? Why not connect the router (WAN/Internet
port) to the modem (Ethernet port 1), and connect all your
computers/devices to your (unspecified) "the router"?Visit http://netgear.com/support , put in your modem model number,
and look for Documentation. Get the User Manual. Read. Look for
"Ethernet ports".http://www.downloads.netgear.com/files/GDC/CM1150V/CM1150V_UM_EN.pdf
Note Your cable modem comes with plugs that cover Ethernet ports
2, 3 and 4. For more information about Ethernet ports 2, 3,
and 4, visit netgear.com/support/product/CM1150V .Fairly snarky reply. Fairly easy to see what the first person was saying. Basically, there are three ethernet ports that don't do what most people would assume they do (provide a wired connection the internet). When the ad on Amazon states "VERSATILE CONNECTIONS: 4 Gigabit Ethernet ports give you fast wired connections to your computer, separate Wi-Fi router, printer, game box, and other devices." it isn't that unreasonable to assume it has router capabilities. I made the same mistake. It appears that it does not. And even though it touts it is certified for Xfinity, knowing Xfinity only has one IP per household and requires routing for additional devices, it isn't very clear that it cannot do this.
And to your point of the user manual, yes, read it. Go to the link it points to for support and find something, ANYTHING, that explicitly says those ports cannot be used to connect to another device. It does say they are reserved for port aggregation, but then defines port aggregation as combining TWO ethernet ports to improve file transfer speed. Why do you need four ethernet ports if you only combine two, and you have a certified Xfinity device, and know Xfinity only gives you one IP, so you know the other two wouldn't work anyway? How do you aggregate two ports when one doesn't work (I don't really understand what port aggregation means here).
"What is your "the router"? Why not connect the router (WAN/Internet
port) to the modem (Ethernet port 1), and connect all your
computers/devices to your (unspecified) "the router"?"That is easy, where the cable comes into my house is a terrible place for a wifi router, so I need to run it through the home network panel and ethernet to another port for wifi, but then need to connect to the network panel to provide wireline service to two other locations in the house for a couple of reasons.
> Fairly snarky reply. [...]
Fairly incomplete/uninformative problem description.
> [...] three ethernet ports that don't do what most people would assume
> they do [...]You're far ahead of me. I haven't surveyed enough people to know
what "most people would assume". When confronted with multiple Ethernet
ports on a _modem_ (not a router), my first reaction would be to get
some documentation which explained how to use them. Which I did.> [...] When the ad on Amazon states [...]
_Whose_ "the ad on Amazon"? Not my fault.
> [...] knowing Xfinity only has one IP per household and requires
> routing for additional devices, it isn't very clear that it cannot do
> this.
Who's "knowing" this? I know nothing, but I might guess that Xfinity
offers some level of service which involves a block of IP addresses.
I'd expect typical residential service to provide one IP address. So
I'd expect a _modem_ not to be able to improve upon that.> [...] Go to the link it points to for support and find something,
> ANYTHING, that explicitly says those ports cannot be used to connect to
> another device. [...]Go to that link and find _anything_ which supports your assumption?
> [...] where the cable comes into my house is a terrible place for a
> wifi router, [...]There are many ways to run (co-ax or Ethernet) cable from one place
to another, and many ways to disribute wireless-network signals in a
large building.
I gather that you bought a device which does not meet your
expectations, and you are unhappy. You seem to believe that those
expectations were reasonable, but they've proved to be wrong. If you
believe that you were misled, then you might direct your complaint to
the folks who led you. I'm not sure what you expect anyone in this
(mostly) user-to-user forum to do.
I am not sure which modem you had with 2 ethernet ports.
Modems with multiple ethernet ports are pretty recent and were available recently on D3.1.
The CM1150v is mostly for having just 1 PC connected or just 1 external wireless router. The additional LAN ports on the 1150v are for static assigned IP addresses from a ISP for mostly a business operation configuration. Or you can connect a LAG compatible router to the CM1150v and use Link Aggregation for bandwdith support. Such as the R7960P which supports LAG on it's WAN side. Again, mostly seen in a business environment.
If your a home user, I recommend getting into any external router and connect all client devices to the router. Use the 1150v modem for your internet service interface and phone support for you phone support needs.
dkrl wrote:Just purchased modem CM1150V, using OSX, Xfinity internet; in the past with other cable modems, I have always used a direct ethernet connection to my Mac through one ethernet port, and then connected my router from a second ethernet port. Netgear customer support said that I can not use that setup with this modem--I can either have the direct connection to the computer OR the connection to the router, but not both. Is this correct? This is the first time I have ever not been able to have both the computer connected directly by ethernet, and the router connected via a second port.
I completely understand what you're saying. There's absolutely no purpose for the other 3 ports because you cannot use them. One device one port, makes no sense to have the other three not sure why they would even put them there to confuse peopleI,
Well I presume this information is in the user manual and how to connect the modem up.
The ports are there for those configurations that support them is all. I presume the ports should be more clearing marked for home users in regards to only using the 1st port.
That is correct only the first one actually works. Cost me a Comcast house visit to figure it out $70, I should have bought the CM 1000 and saved over a $100 on the modem!
Very deceiving to show 4 ports one the product and put in the description "4 x 1G Ethernet Ports"!
Well if you need phone support from your ISP then the 1150v would work and be benificial. If not, then this isn't the modem that you should be using as you would be paying for a feature that your not using anyways. No where does it state that it includes a router so this would be one key to remember.
You can also remember this, any NG CM series models are catagorized as modems only. So no built in routers what so ever. Even though some of 4 ports in back, this doesn't indicate a presence of a router. NG C series modems are generally catagorized as modem/routers or "gateway" modems. These do have built in routers and wifi and also have 4 ports in back. Something to keep in mind when reviewing NG modem products.
If yon can, return the 1150 modem and go with a CM1000. You still need a external router to connect to this modem for router and wifi featuers.
Good Luck.
Very deceiving to show 4 ports one the product and put in the description "4 x 1G Ethernet Ports"!
Indeed . Fortunately I have routers everywhere just unplugged and plugged ethernet cords , but wasted 3 hours trying to figure it out
Users should read the user manual as well.
"Multi-Gig Speed Cable Modem for XFINITY(r) Voice" says the box - verbatim. Got the modem, got Xfinity's fastest plan they would sale. Doesn't actually do more than 1 gig. Wait, what? Yep, it's a multi-gig modem that doesn't support multi-gig. Sad. It might be accurate to say it's a Gig-speed cable modem, 'ready' for future *potential* multi-gig speeds. But not today.
Mutli Gig means having two or more WAN ISP addreses into the modem. Four ports are for separation WAN IP addresses from the ISP or you can LAG. WAN port would be 1 IP address, followed by a different IP address from the ISP set to the other ports.
I do this on my CM1100 with just 2 ports. I have one IP address on WAN port 1 and another IP address from the ISP on the 2nd port. I have two different routers connected to the modem so two different networks. I have 1G support here so just sharing what I believe is the 1 Gb speed on the line. I get 1Gb speeds on both networks.
daviburg wrote:"Multi-Gig Speed Cable Modem for XFINITY(r) Voice" says the box - verbatim. Got the modem, got Xfinity's fastest plan they would sale. Doesn't actually do more than 1 gig. Wait, what? Yep, it's a multi-gig modem that doesn't support multi-gig. Sad. It might be accurate to say it's a Gig-speed cable modem, 'ready' for future *potential* multi-gig speeds. But not today.
Furrye38
For some reason the forum refused to accept my login credentials and made me set up a new name (RTSwiss2). I finally found the time to try connecting a second router to one of the other ethernet ports on the CM1150V. I used port 3, shut down the wireless on the router (so as not to conflict with existing SSIDs) and connected a computer via hard wire to the router, and powered up the router. Computer found the router, and the router found its way to the outside world. I have thoughts on (a) why this worked, and (b) why it is not a "theft of internet services" as someone kept insisting earlier in this thread. Will fill in the details later, but the short answer is that, at least using ports 1 and 3, the CM1150V, like your CM1100, can drive more than a single LAN via separate routers simultaneously.
Best
