Two Cable Modems/One IP address?

Two Cable Modems/One IP address?
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Subject Author Date
Two Cable Modems/One IP address? Ken 02-07-2005
Posted by Ken on February 7, 2005, 8:45 am
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Hi. I have two computers in my house that use the Internet: a PC
upstairs and a Mac G4 downstairs. I'm going to move from dial-up to
broadband, and I have a question about this.

The laptop doesn't need to move around. My wife only uses it in her
office (she then takes it to her work office, too, which is why she has
a laptop), so I don't really need to go wireless.

So I wanted to know if I can get a cable modem for downstairs and one
for upstairs and still just have one IP address from Comcast? Or does
each cable modem have to have a distinct IP address?

Thanks for any info!

Ken



Posted by James Knott on February 7, 2005, 12:07 pm


Ken wrote:

> So I wanted to know if I can get a cable modem for downstairs and one
> for upstairs and still just have one IP address from Comcast?  Or does
> each cable modem have to have a distinct IP address?
>

You cannot share an IP, between two cable modems. If you want to share your
cable modem, you'll need one of those cheap firewall/router boxes, from
SMC, D-Link etc. Some models support wireless.



Posted by Ken on February 7, 2005, 8:52 pm


James Knott wrote:

>Ken wrote:
>
>
>
>>So I wanted to know if I can get a cable modem for downstairs and one
>>for upstairs and still just have one IP address from Comcast? Or does
>>each cable modem have to have a distinct IP address?
>>
>>
>>
>
>You cannot share an IP, between two cable modems. If you want to share your
>cable modem, you'll need one of those cheap firewall/router boxes, from
>SMC, D-Link etc. Some models support wireless.
>
>
>
I've heard some bad things about wireless, especially since my computer
is a PC and would be communicating with a Mac G4 on the other end.

How far can I run a wire from the router without degrading the signal?
I'd need to run it from a router in my upstairs office to my wife's G4
downstairs. I guess that would be about 60 feet. Can the average 60-70
dollar router handle that?

Thanks again,

Ken


Posted by $Bill on February 7, 2005, 7:33 pm


Ken wrote:

> I've heard some bad things about wireless, especially since my computer
> is a PC and would be communicating with a Mac G4 on the other end.
>
> How far can I run a wire from the router without degrading the signal?
> I'd need to run it from a router in my upstairs office to my wife's G4
> downstairs. I guess that would be about 60 feet. Can the average 60-70
> dollar router handle that?

Get a wired router then and you can run Cat 5 or Cat 6 cable for those
lengths easily. A Netgear or Linksys wired router is probably available
for almost free with rebates. Just check the Sunday ads at Circuit City,
Best Buy and CompUSA along with the Office stores.




Posted by James Knott on February 7, 2005, 9:43 pm


Ken wrote:

> I've heard some bad things about wireless, especially since my computer
> is a PC and would be communicating with a Mac G4 on the other end.

You definitely want some security on WiFi.
>
> How far can I run a wire from the router without degrading the signal?
> I'd need to run it from a router in my upstairs office to my wife's G4
> downstairs.  I guess that would be about 60 feet.  Can the average 60-70
> dollar router handle that?

Ethernet is rated at 100 M (328 feet). If necessary, you can place the
router half way between the modem and computer, for a total run of 200 M.
You'd have a pretty big house, if that's not enough. ;-)




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