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Thread: IPSec VPN to Cisco router - with dynamic IP address

  1. #1

    Question IPSec VPN to Cisco router - with dynamic IP address

    First post...brand new Quadro2x user for my home office. Good stuff!

    I need to set up a permanent VPN connection between my home office and my company's main office. My Quadro acts as the router/firewall/gateway, the DSL modem is in pass-through mode so the WAN side of my Quadro has a public IP address.

    Currently, I have a dynamic IP address on the WAN side. I was reading the tutorial on the support web site about setting up an IPSec VPN between the Quadro and Cisco routers, and it assumes that the Quadro's WAN side has a static IP address.

    Does anyone know if this will also work (on both Quadro and Cisco side) with a dynamic IP address, by using a DDNS hostname instead of the static IP address? if not, I'll have to spring for a static IP address plan...a bit more pricey.

    Thanks!

  2. #2

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    As far as I know, Cisco devices doesn't support RoadWarrior VPN, so it's not possible to create a VPN with the Quadro with Dynamic IP.

  3. #3

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    Hi Aram,

    With "RoadWarrior" you mean a soft VPN connection that has a changing remote IP address? That's how I currently connect to our company network though, using the Cisco software VPN Client.

    But hey...I may opt for static IP anyway, certainly has it's merits. It'll be 65 bucks instead of 30 per month, but oh well...

  4. #4

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    I am not a Cisco admin, but till now I didn't find anything in Cisco setup that will allow to create a VPN with the device that has a Dynamic IP. Here is the definition of RoadWarrior - the remote device is connected to the Internet with a dynamic IP address and acts as a Road Warrior (you don't know its IP address). I don't know if it is possible with 2 Cisco devices/SW and how, maybe Cisco left some hole for that. Also I've found the following information on their website:

    "The Cisco VPN Client is compatible with the following Cisco products:
    • Cisco 6500 / 7600 IPSec VPNSM and VPN SPA IOS Software Release 12.2SX and later
    • Cisco VPN 3000 Series Concentrator Software Version 3.0 and later
    • Cisco IOS Software Release 12.2(8)T and later
    • Cisco PIX Security Appliance Software Version 6.0 and later
    • Cisco ASA 5500 Series Software Version 7.0 and higher "
    It means that they use some internal way to do a VPN and probably it isn't work with other devices.

  5. #5

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    Probably reasonable to point out that a dynamic
    IP address actually *is* a static IP address that
    is temporary (it could change at any time).

    A DDNS address is simply a redirection that is
    automatically updated to your current IP
    address (that is, it tracks any changes). The
    DDNS hostname itself is static.

    You should be able to use a DDNS service with
    VPN; at any rate, most of these services are
    either free or dirt-cheap. Give it a try. Dave

  6. #6

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    Quote Originally Posted by daysys View Post
    Probably reasonable to point out that a dynamic
    IP address actually *is* a static IP address that
    is temporary (it could change at any time).

    A DDNS address is simply a redirection that is
    automatically updated to your current IP
    address (that is, it tracks any changes). The
    DDNS hostname itself is static.

    You should be able to use a DDNS service with
    VPN; at any rate, most of these services are
    either free or dirt-cheap. Give it a try. Dave
    Hi Dave,

    Yup, I've been a religious DDNS user for years...works great for remoting into my LAN while traveling! Was glad to see the Quadro supports that as well.

  7. #7

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    Quote Originally Posted by aramk View Post
    I am not a Cisco admin, but till now I didn't find anything in Cisco setup that will allow to create a VPN with the device that has a Dynamic IP.
    I figured it should be possible to configure a PIX to accept dynamic IPSec connections, since that's what happens with anyone using the soft VPN Client. Started digging, and found this for PIX 6.x, there's also one for 7.x. I'll try messing with this....if I get it to work I'll post here.

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