How do I setup multiple public IPs?

We currently have a setup with the AT&T modem in bridge mode, which goes to a Linksys 4-Port Gigabit Security Router with VPN modem that has the PPPoE information configured. Behind that we have another Linksys router with a different network address scheme that we want to access the Internet but use a different public IP address than the network directly behind the VPN router. We have a static IP address with AT&T with 6 addresses that aren't being used. I was thinking maybe we could do something with NAT to make it happen, but I don't see any configuration options for NAT that would allow me to do something like that. Another alternative I was considering was putting a switch behind the modem and putting two seperate routers directly behind that, but I don't see a way to do a static WAN IP with a PPPoE configuration. Any other suggestions will be greatly appreciated, basically the main objective is to just get both networks online but using seperate public IP addresses and only one modem.
ShadowtheDragonAsked:
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dpk_walConnect With a Mentor Commented:
Mostly linksys routers will give you the option to configure DMZ where you can forward a public address and also there would be no NAT/firewall for the specific public IP on DMZ port.
Which model of routers you have.

Thank you.
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ShadowtheDragonAuthor Commented:
The routers are Linksys RVS4000 4-Port Gigabit Security Router with VPN.
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dpk_walConnect With a Mentor Commented:
Go to Setup->DMZ; here you can enable DMZ and specify the internal IP address of the internal router under DMZ Host IP Address. Click Save. I do not think in this case you can configure another public IP address to be forwarded, but can you please confirm if this is the case.

Thank you.
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ShadowtheDragonAuthor Commented:
Sorry for the delayed response. I had no luck with using DMZ, that's just for mapping one internal IP address to your external address. I think what we are going to do is just get a second DSL line and use that for the other network. Thank you for your help.
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