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Two Cable Modems? One House?

Izumi Reina
By Izumi Reina
in Networking
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Hello so I have a cable modem, router, etc. Which was recently moved to the other side of the house. I was wondering if I could hook up another cable modem to where the cable modem was origonally (1m away from me) so I can hook up my computer, while still having the cable modem, router, etc. still hooked up on the other side of the house.

 

Break down:

One Cable Modem (on one corner of the house)

One Cable Modem (on the other side)

Will it work?

Can I have two cable modems working at the same time?

 

Both Cable Outlets work.

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Posted
10 minutes ago, AsianvsWhite said:

Hello so I have a cable modem, router, etc. Which was recently moved to the other side of the house. I was wondering if I could hook up another cable modem to where the cable modem was origonally (1m away from me) so I can hook up my computer, while still having the cable modem, router, etc. still hooked up on the other side of the house.

 

Break down:

One Cable Modem (on one corner of the house)

One Cable Modem (on the other side)

Will it work?

Can I have two cable modems working at the same time?

 

Both Cable Outlets work.

Yes it will work but you have to have a seperate service contract for the other cable modem. When you connect a cable modem to the network, it doesn't "just work" - it actually reachs out to a CMTS and asks for both configuration settings and access. The CMTS will only provide this to modems that the ISP has linked to an account, and they won't link more than one modem to your account unless you're paying for it.

 

The policy for this varies by cable company - some let you add a modem to the existing bandwidth plan for $10-20 per month. Others require you to purchase a completely seperate bandwidth plan for the extra modem. You have to call your ISP to find out the exact quote for you.

Looking to buy GTX690, other multi-GPU cards, or single-slot graphics cards: 

 

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3 hours ago, mcraftax said:

Why don't you just run a cable from one side of the house to the other, if this is not a option, maybe wireless (idk what your house it like) or powerline connection (i do not recommend)

 

If you were to get to connection I would either have them both connected though their modems to a router which has load balancing or two router is a complicated two gateway setup (not recommended for home, it is complicated).

 

What I don't get is why not just 'connect' in one way or another to the existing network?

Cause if you did get another connection would you have it load balanced into the existing network, two gateways or two separate network?

I would just connect it to the existing network or load balance the connection if you do get two line but I do not see why other than redundancy if one fails.

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Just want to point out - two modems running on the same coax cable to the house (which probably splits at the house, not before) are probably going to suffer an outage at the same time as one another, except for modem failure. Network failure is more common than modem issues once you rule out lemon modems.

Looking to buy GTX690, other multi-GPU cards, or single-slot graphics cards: 

 

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Just run some cat5e, it will be all the speed you need. You can hook a router to it in ap mode or a small switch and ap. That way you don't struggle with 2 modems and 2 networks, you can have 1 extended network. If you dont want to run cable just get a decent directional antenna. 

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3 hours ago, mcraftax said:

I thought it was two separate lines

You only have one line coming in to your house. So technically it would be 2 cable modems on 1 line. Also you have to consider that modems require the best signal to operate. Meaning, if you have too many splitters in line it will fuck up your signals going to your modem. Thats why most companies install the modem off a 2 way splitter from the line coming in. One side does internet while the other is for TV. 

 

However, most ISP's will require you to pay for service for each modem. So you will have to get new service, and would probably need them to run a drop from the pole on top of that. There is also a huge chance that they will say no.  

I just want to sit back and watch the world burn. 

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4 minutes ago, mcraftax said:

I don't get why you would buy two line from the same isp! that is not redundancy and if you want two external ips/networks you would have a modem going into a switch going into two router's WAN ports and two subscriptions (type of think)

I think it so the OP has their own connection. Maybe the OP doesnt have good wireless or has a shitty connection. So instead of sharing it, has decided to just get their own connection. 

I just want to sit back and watch the world burn. 

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4 hours ago, mcraftax said:

I don't get why you would buy two line from the same isp! that is not redundancy and if you want two external ips/networks you would have a modem going into a switch going into two router's WAN ports and two subscriptions (type of think)

Technically you can set up a CMTS to give out more than one IP address on the same cable modem (and it's also possible to have the CMTS act in bridge mode instead of router mode), but it is rare in the large cable ISP networks, at least in the US, for any of them to do that. They might for business customers, especially static IP customers, but they won't do it for residential users. And that wouldn't be full redundancy if there is only one modem because a single is a single point of failure and can also only work on one ISP.

Looking to buy GTX690, other multi-GPU cards, or single-slot graphics cards: 

 

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