Multiple public IP’s from 1 internet connection on different networks?

45 pts.
Tags:
Cisco Routers
Internet access
IP address
Linksys
Network design
Router Troubleshooting
Switches
Is this a possible scenario? A cable modem is hooked up via ethernet to a Linksys 5-port switch. That switch is then hooked to a Cisco SOHO router (not managed by me) and my Linksys router. I cannot get my public IP to work on my router but the Cisco routers public ip comes up fine. I have all of the standard info plugged into my router but I am unable to get out to the internet. Any suggestions? Thanks, Jimmie

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No. Cable modems identify the client using the hardware mac address. The cisco router is currently the only hardware that the modem will connect to.

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  • Fahad
    Yes, you can get multiple Public IP addresses on your WAN depending on your requirments. You should setup your network by connecting your cable modem with the Cisco Router using an ethernet cable(CAT5 or CAT6) and connecting your Cisco Router with the Switch and Switch with client computers.You should only use a switch if you want to connect more than 1 computers with the Router. Are your computers geting TCP/IP configuration dynamically or statically? Make sure you contact your ISP and ask them about the TCP/IP configuration and its settings. What do you mean by applying your own Public IP on the Router? Please note that you donot have to assign your favourite Public IP address to any of these devices, the Public IP address is assigned to your device by the ISP. If you are not able to access internet by using this setting. Then contact your ISP and ask them about the TCP/IP configuration. After confirming the TCP/IP configuration of your computers, just check the connectivity of your Computers NIC Card with the LAN interface of the Router(Which is a default gateway) on your computer. First get all these details including the Operating System that you are using ,so that we can provide you proper help. Regards,
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  • GatekeeperJB
    There is only 1 computer that is plugged into my router, which is Windows XP, and it has an address of 192.168.1.50, it is also on the DMZ. I've been talking with the ISP back and forth, confirmed all of my settings, and they even tell me it should work, but it doesn't. The WAN side of my router has a static ip, given to me by the ISP. I plugged my laptop directly into the 5-port switch, which is connected directly to the modem, and I can't get out onto the web. The only way I can get out is if I plug into the Cisco router, which I do not have access to. Thanks, Jimmie
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  • mshen
    It's the MAC address. The cable modem can only connect to one device at a time. Since your laptop works, your internet provider will not want to help you futhur. You need to use MAC Cloning on the Linksys router to clone the MAC address of your laptop.
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  • mshen
    Messed up... Since the cisco router is the only device that can connect, you need to use that MAC address to connect to the modem. Remove the hub and plug directly into the modem. Turn off the modem, unplug it from the cable socket, and turn it back on. This may release the MAC address on the modem otherwise have the service provider re-associate the modem to the device. Your service provider will only care if no devices can connect and they will only be able to assist you as far as connecting a single device (your laptop) directly to the modem.
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  • GatekeeperJB
    Is it possible to clone the MAC address of the Cisco box to use with my router? The Cisco box is used for their cashless system and needs to be connected. The ISP claims they are not associating a MAC address with anything. Thanks for the help, Jimmie
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  • mshen
    You should be able to manually add the desired MAC address to the router, but that would cause a conflict if both routers were connected. The basic rule of thumb is to connect a single router to the modem and connect all other devices to the router. After all, the modem is a layer 2 device; it does not have the routing capability. Fahad mislead you. If you read furthur into his explanation he is describing the scenario above.
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  • GatekeeperJB
    If I were to put my Linksys router directly after the modem, the Cisco router would not work, correct? I have no way to configure that box so connecting it to my router would disable it's functionality. I do know its setup though, could I configure that somehow in my router and pass the internet connection to that box? Thanks, Jimmie
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  • mshen
    I'm not very familliar with the linksys router, but I'm not sure that you could get that to work. It is a question for Linksys support. You could put your 5-port switch behind the Cisco router and get a connection off that.
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  • Kevin Beaver
    Can you take your Linksys router out of the loop altogether? Or, even the Cisco router?
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  • GatekeeperJB
    I can't touch the Cisco router because it is used for their cashless system and I don't have access to it's settings. I need to be able to hit a DVR remotely that is attached to the Linksys router so I don't think I can get rid of that either. I have two static ip's for this location and one is being used by the Cisco router. I am trying to get the Linksys router to be set as the other static. Thanks, Jimmie
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