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How do I setup multiple public IPs?

Posted on 2009-04-16
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Last Modified: 2012-05-06
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.
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Question by:ShadowtheDragon
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dpk_wal earned 750 total points
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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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by:ShadowtheDragon
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The routers are Linksys RVS4000 4-Port Gigabit Security Router with VPN.
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by:dpk_wal
dpk_wal earned 750 total points
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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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by:ShadowtheDragon
ID: 24221006
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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