I currently have Roadrunner cable service. One cable modem connected to a
router which connects to my 4 computers.

I need one of my 4 computers to have a different IP address than the others
for a program I am working on.

Roadrunner offers an additional IP address for $4.50, cost is not a factor
as I need this extra ip.

Question:
If I call and get the additional IP, how do I set this up. Someone told me
that I would need to connect the cable modem to a hub and from the hub
connect one computer to it and the router for my 3 other computers.

Is this correct? I am confused as to how 2 ip's can be sent to one cable
modem? Does the HUB know what to do? How?

I have a dlink router, can anyone recommend a hub?

Thanks for your time.

Robert Riehl wrote:

That is correct. Any hub will do. There's no reason to spend more than
you have to.

Why would it be confusing that more than one IP can be behind a
cablemodem? The cablemodem is nothing more than a bridge between the
Ethernet and the RF cable portion of the network. If there can be
traffic for more than one IP on the cable going by your house, serving
you and your neighbors, why couldn't there be more than one IP on your
side of the bridge between the mediums (Ethernet and RF cable)?

--
Warren H.

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"Robert Riehl" <robREMOVE_THIS_PLEASE@robertriehl.com> wrote in
news:7ZaZc.28223$Ot3.17289@twister.nyc.rr.com:

If what you need is two IPs from your ISP rather than two IPs from your
router, your friend is correct.

If you purchase another IP from Roadrunner, you'll get two IPs handed
out by Roadrunner to your modem. Connect the modem to a hub. A 4 to 5
port auto-sensing hub will cost about $20 or $30, and allow you to use
all straight-through cables. Most brands will do; this Netgear FS605
will work:

http://tinyurl.com/6lcp4

Connect one pc to the hub, and the D-Link router to the hub. Connect
your other three pc's to the router.

Basically, that's it. You're modem is sending two IPs to the hub, and
your hub is sending one of those to the pc, and the other to your
router.

Bruce

Never anonymous Bud wrote:

Actually you could also get a second router (if I understand what
you're trying to do) free after rebate and use that to bridge your
two networks if that's closer to what you need to do to test.

http://shop4.outpost.com/product/3321502

I'm not sure I understand why you need a 2nd IP address.

Robert Riehl wrote:

Some routers can handle more than one IP and forward them to the appropriate
computer. A hub doesn't "know" how to do anything, but pass on packets to
all ports. A modem can be configured to handle more than one IP, but sends
them out on the same wire, to whatever you have connected to it. So, if
you had a hub (or switch) between your modem and router & computer, both
the router and that one computer would see the data from the modem. They
would only respond to data sent to them.


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