I have a high speed internet via a cable modem. I received 2 ip addresses from my provider. Can I use 2 different routers: Linksys and Watchguard Firefox Soho, and still have dhcp enabled on both?
Well, you certainly can, but in most cases it only makes things more complicated than they need to be.
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To actually do it, I'd put a hub in front of the two routers. So your cable modem would go into the hub, each router would be connected to the hub, and each would configured to respond to one of your two static IPs. You could then connect your computers to one router or the other, as you saw fit.
I'm just not sure why, in most cases, you'd want to do so.
The drawback here is that your machines on one router will not be able to share folders or printers with machines on the other router. Each router represents its own private sub-network on the internet.
Multiple internet IP addresses are really only useful if you have multiple computers that you want to access from the internet. For example you might want to set up two web servers, in which case each would need its own IP address. For most common home and small business situations, that kind of setup is actually pretty rare.
My ISP has allocated me 5 IP addresses here at home, but I use only one. All the computers in my house (8, I think) are connected behind a single router. I really don't have any need for the other 4 IP addresses at this time.
I suspect that, unless you're doing something special, you really only need one of your two IP addresses. It'll certainly be the simplest approach.
Related:
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Ask Leo! - What can people tell from my IP address?
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Ask Leo! - How do I figure out who owns an IP address?
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Ask Leo! - Why does my home network only work with one computer at a time?
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Ask Leo! - What happens if two computers have the same IP address?
Article C2324 - April 6, 2005
Leo, I just read your comments on 'How can I use two ip addresses from one cable modem?' and I have a question. First the problem: two divisions in our company who were completely independent, seperate physical locations, domain controller, webservers... (except for VPN), are moving into our new building together. The long term goal is to have one domain and one network, but my short term goal is to get people back to work. I need to maintane two domain controllers each on a seperate subnet behind one cable modem with 5 static ip address assigned to it. Your solution of a hub sounds easy enough. Is that the best way to share the internet connection for now or is there a better way?
Posted by: Greg Thurmon at January 30, 2007 5:54 AMThanks a lot for your advice.
Greg
can i change my modem smartax to a different router
Posted by: steven at November 26, 2007 11:41 AMLeo,
I have client software for car washes that require that I use multiple IP addresses, how do I setup my router to use a single cable modem with two separate IP addresses?
I'm using a netgear FVS318.
I alos have 2 connections for credit card processing, 1 for a computer, and 1 for my CCTV system.
Please help, COX is not help, and the company who makes my car wash equipment doesn't know how to port forward, so this is way beyond them!
Thanks
Lou
Posted by: Louis KIm at March 7, 2008 7:40 AMi have a DSL connection and the ISP gave us 7IPs so how can i possibly use all of those IPs and i'm using D-Link router..
please help with these
Posted by: mugz at October 2, 2008 5:26 PMI put two computers on the same modem now i was wanting to information to the other so how ?
Posted by: Patricia Boston at November 5, 2008 4:43 PMHi,
I have one broadband line into my property, yet my ISP has allocated 5 IP's.
I want to set up SBS 2008 in a test environment to get to grips with it before rolling it out to a client. To test exchange i need use 2 external IP's but i only have one connection, and my router has only one WAN port.
Is it possible to configure a draytek 2600G to use 2 external IP's through one phyical connection?
There are various options such as WAN alias addresses, but i am unsure how to link the external IP's to the correct machine? Do i create VLAN's and set port forwarding?
Any help would be greatly recieved!!
Posted by: Nelzihno at November 6, 2008 5:45 AMMy cable provider does not supply static IP addresses. Can this still be done without static IP's? If so how does each router know to get a different IP address?
Posted by: John at December 12, 2008 6:46 AMHi, Leo
Posted by: Tanel at February 17, 2009 12:03 PMCan u help me with that, i have one router and 2 computers. they both are same ip-s. but i play one game with my brother and i was wondering, if there is possible to change ip-s to different? then we could have different ip-s with one router. can u help please. thanks
hello i need second 2 ip address beacuse i have ojo and viedo phone now they spreated easy to contact which can easy to contact ????
Posted by: marcus ridley at February 19, 2009 8:17 AMi have a laptop that is connected to peoplepcdsl modem.my daughter who is in the same apartment as i am has a verizon dsl modem.how can we use our computers at the same time when i only have i phoneline
26-Feb-2009