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Multiple static IPs and NAT?

V

vash

Platinum Member
Here is how my connect DSL connects to the net:

Fujitsu DSL modem -> Netgear RT314 (router) -> 10/100 Switch (rest of network).

I have one (1) static IP to the net and basically run NAT for all of my needs (works great, no complaints). I'm wondering how I would add a second static IP from my ISP. I'm thinking all I'd have to do is specify the new IP address in one of my clients, point that new client to the gateway of my ISP (instead of my router) and that machine would be on the net without NAT.

Is this really possible, or am I dreaming? I'm thinking I would have to change my network around a bit to something like:

Fujitsu DSL modem -> 10/100 Switch -> Router, clients, etc.

With this setup, I would just specify the same information to the router, it would still serve as the gateway and DHCP server, but I could also have machines on the net, without using NAT -- with their own static IP.

Any help here? I know the whole arguement of "why don't you forward specifc ports to machines", been there, done that -- bought the T-Shirt. I already have ports and port ranges forwarded to a server behind my router, but I want a machine with a direct connection to the net, without any protection of NAT, etc.

If anyone could help, reconfirm any of my thoughts, etc, I'd greatly appreciate it.

vash
 
What you are proposing would work although you would then be running 2 separate networks and the machine not behind the router/NAT would be like any other machine on the internet. That's probably the best way to do it in your situation as I don't think the cheap SOHO routers (Linksys, D-Link, etc) are capable of doing what they sometimes call "multi-nat". Routers such made by Cisco and Netopia would be capable of mapping the static-IP through NAT and allow you to keep your original setup. Not a big deal either way, but the Cisco/Netopia solutions are probably too pricey for home use.
 


<<
Fujitsu DSL modem -> 10/100 Switch -> Router, clients, etc.

With this setup, I would just specify the same information to the router, it would still serve as the gateway and DHCP server, but I could also have machines on the net, without using NAT -- with their own static IP.
vash >>



Not sure if i'm understanding what you mean here correctly. But i think what you are saying is that you would have the router and all the pcs plugged into the same 10/100 switch. That wouldn't work.
Fujitsu DSL modem -> 10/100 Switch -> Router & pc(s) with thier own ip addressed -> another switch hub what ever connected to the router with all the pcs that you want going threw the nat connected here.

Basically for the nat to work the internet connection has to be on one side with the PC's on the other. You can't have them all connected up to the same side.
 
What I want to be clear is this:

1. I want one section of my network to be behind the NAT.
2. I want the other section(s) of my network to not be behind the NAT and be on the net with their own static IPs.

All of the replies are helping, I'd like to see some more, from others who understand what I want to do.

The routers seem ok, but any links to the models?

vash
 
OK, Easy.

Get a four port Switch of whatever brand you prefer. COnnect your cable/DSL modem into the switch. Plug your router into the switch. Plug your "un-nat'd" machine into the switch.

You're done.

The PC that plugs into the new switch has the second ISP address, the router has the original ISP address.

The PC that plugs into the new switch has the default gateway from the ISP (which would be the same as the "WAN" default gateway configured on the router). All the computers behind the router use the router's inside address for their default gateway.

Good Luck

Scott

 
vash,

Did you say that you had more than one PC that you would like to have non-NAT'd with a static ISP assigned IP's? Or was it just one?
 


<< vash, Did you say that you had more than one PC that you would like to have non-NAT'd with a static ISP assigned IP's? Or was it just one? >>

Essentially, I would like one machine that will be a straight connection to the net and not NAT'd, but that could be expanded to more than one machine.

Ideally, I would want three static IPs from my ISP. Two for DNS servers (which I will register as DNS), while the rest are behind a NAT.

Thanks ScottMac for the tip, I figured it would be that way to connect everything, but I wanted to hear from someone else who has done this. I know its possible, I just want to make sure the cabling is all I have to change.

vash
 
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