My @home service comes with 2 ips, i know i can share internet service with 3 computers with 1 ip. Is it possible to share one of the with 2 computers and the third computer having its own ip. I have a SMC barricade 4 port router. Or is there any point to doing that way. I just hate to waste an ip

If you have an extra hub or switch, yes.

code:
|------|
Modem |--| | PC |
|--| | |----| |
----| |----| | |------|
|--| | | |------|
| | |--| | PC |
Hub | |----| |------| |
|--| | | |------|
| |
| | |------|
Router | |------| PC |
|--| | |
|------|

The PC that doesn't plug into the router would have your 2nd ISP-issued IP address.

As for whether or not there's a point to set up your network this way... The only reason I could think of to do it offhand is if you wanted to run a server or keep a system visible outside your firewall for some reason.

I have a hub right now, so that would work, but wouldn't the hub hurt the bandwith between the router and the other computer connected.

There would be reduced bandwidth on connections between the computer on the hub and the other two computers -- mainly because the hub is probably operating at 10 Mb/s, while the ports on the switch are 100 Mb/s.

The bandwidth between the cable modem and any of the three computers shouldn't be an issue. Even the hub's 10 Mb/s speed can easily outpace cable modem download speeds, and I doubt there would be enough contention between only three systems to cause much of a problem accessing the cable.

...but 'wasting' an IP address is still your most efficient network setup!

quote:Originally posted by DR.NO:
I have a hub right now, so that would work, but wouldn't the hub hurt the bandwith between the router and the other computer connected.

You don't need the hub at all, asign the 2nd IP address to the computer, plug it in to the router and let the router do it's job. This is a common configuration for small businesses who want to run there own e-mail server for instance.

Oh you may want to add a 2nd NIC if you plan on using the computer on the same network as the other 2.

quote:Originally posted by simmons777:
You don't need the hub at all, asign the 2nd IP address to the computer, plug it in to the router and let the router do it's job...

But if the ISP assigns IP addresses via DHCP, then you *can't* assign the address manually -- you wouldn't know what address to assign. And if you set the machine for DHCP, then the router is going to give it a local IP address, not the 2nd ISP-assigned address.

Also, the ISP-assigned address would fall within the ISP's IP range. When the box is on "your side" of the router, it's not on the correct network for its IP address.

code:
|
24.X.X.X | 192.168.1.X
Network | Network
|

|--|
| |---------- 24.9.162.38
<--ISP | |
------------| |---------- 192.168.1.92
| |
| |---------- 192.168.1.85
|--|
Router
24.9.162.50

When the router sees a packet on the ISP side bound for any 24.X.X.X address other than its own, it should ignore that packet, leaving it for another machine on the 24.X.X.X network. No data would ever get to the 24.9.162.38 address then.

Data on your local network would get to and from the 24.9.162.38 box just fine, though, as the switch built into the router doesn't care about IP routing rules. Data from one of your LAN machines bound for another LAN box doesn't even get to the router, logically. The switch and router are separate devices, even though they're in the same housing, as shown below.

code:
|--|
|--| | |---------- 24.9.162.38
<--ISP | | | |
---------| |----| |---------- 192.168.1.92
| | | |
|--| | |---------- 192.168.1.85
Router |--|
Switch

If there's a flaw in my reasoning, someone please let me know and tell me why. (I don't mind being wrong, so long as I learn from it!)

so it would be just as well to use only the one ip with just the router and forget i have the second ip. I think that is the way i will do it

You might want to check with your ISP about that. My At&t account has 2 ip address,but I am only allowed to use 1 at a time. Or it cost me more.

do noticeable speed drops in a game happen if second computer is on a diffrent game/site at the same time.
what is better for two on one line tv cable or dsl hook ups?
do cost of hardware vary much between dsl and cable tv for two at once use??
will 10/100 work or is a router needed on both types in addition to modem[s]??

Hey,
If you have 2 static Ips, could you use the router to splice 1, and let it pass the other?

E.g.

[CODE]C--R--Ip1--Comp1+Comp2
|--Ip2--Comp3[\CODE]

A router can pass static ip's right? Or all comps connecticed to ip have to have dynamic ip enabled?