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Can you have multiple IPs on broadband without a router?

B

busmaster11

Platinum Member
So a co-worker of mine told me the other day he's paying 32.95 a month for Comcast Cable modem service, and he's able to have multiple machines on the net via a hub plugged into the cable modem. Is this possible? I'd assume if he knows what he's talking about that those would be external IPs, but would Comcast issue cable modems that can do that? If they're internal IPs, are they now integrating routing functions into these things? He's not even paying for additional IPs.

Can someone shed some light on this for me?
 
i have a charter cable intenet account. i am allowed up to 3 different ip addresses. alll you need to do is plus in the hub. i am guessing that comcast does something similar.
 
They're public IPs he's paying for.

The hub just broadcasts all the packets through each connected port, and each NIC knows which to receive.

One annoyance is that for any communications between the two nodes, the packets go through the ISP gateway first. That means latency of multiple milliseconds instead of microseconds (on a LAN).

The workaround is to setup appropriate static routes on each client.
 
You can do this with Verizon PPPoE, at least in my area. You just plug multiple computers into a hub connected to the DSL modem, and just log in from each computer.
 
Originally posted by: manly
They're public IPs he's paying for.

The hub just broadcasts all the packets through each connected port, and each NIC knows which to receive.

One annoyance is that for any communications between the two nodes, the packets go through the ISP gateway first. That means latency of multiple milliseconds instead of microseconds (on a LAN).

The workaround is to setup appropriate static routes on each client.
Click to expand...

If they're public IPs then no router is involved I assume. Why would an ISP allow this and not charge for it? Don't they all charge extra for more IPs?

A router would still be better, correct? As far as security is concerned?

Thanks to those who put in their two cents btw.
 
Originally posted by: busmaster11
Originally posted by: manly
They're public IPs he's paying for.

The hub just broadcasts all the packets through each connected port, and each NIC knows which to receive.

One annoyance is that for any communications between the two nodes, the packets go through the ISP gateway first. That means latency of multiple milliseconds instead of microseconds (on a LAN).

The workaround is to setup appropriate static routes on each client.
Click to expand...

If they're public IPs then no router is involved I assume. Why would an ISP allow this and not charge for it? Don't they all charge extra for more IPs?

A router would still be better, correct? As far as security is concerned?

Thanks to those who put in their two cents btw.
Click to expand...
ISPs usually charge about $5 for each extra public IP you get.

A router is usually a smarter choice, unless you do want to run multiple public servers.
 
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