Home > Ask the Networking Experts > VPNs with Lisa Phifer Questions & Answers > I am having issues with the IKE communication between the two Cisco VPN concentrators.
Ask The Networking Expert: Questions & Answers
EMAIL THIS

I am having issues with the IKE communication between the two Cisco VPN concentrators.

Lisa Phifer EXPERT RESPONSE FROM: Lisa Phifer

Pose a Question
Other Networking Categories
Meet all Networking Experts
Become an Expert for this site


Digg This!    StumbleUpon Toolbar StumbleUpon    Bookmark with Delicious Del.icio.us   


>
QUESTION POSED ON: 22 March 2005
I have two Cisco VPN 3005 to VPN 3005 concentrators, which are configured to use the LAN-to-LAN configuration. I am having issues with the IKE communication between the two devices. It will work if I enable network autodiscovery on both sides. It will not work when I disable routing and use a network list. I cannot even see if the devices are attempting communication at all in the live event logs. I only see traffic if I enable network autodiscovery even if it is only on one side. Please help.

>
EXPERT RESPONSE
Cisco's private network autodiscovery is an alternative routing method for LAN-to-LAN configurations. To use autodiscovery, inbound RIPv2/v1 must be enabled on eth1. Here are some Cisco troubleshooting documents that might help:

  • Configuring LAN-to-LAN Network AutoDiscovery
  • Verify/Test LAN-to-LAN Network AutoDiscovery
  • Configuring NAT over LAN-to-LAN between Cisco 3000 series VPN concentrators

    You may also want to put a LAN analyzer on the Ethernet between your VPN concentrators. If you don't have a LAN analyzer, try downloading Ethereal. You won't be able to see what's inside IKE, but you'll be able to see if IKE or any other packets are being exchanged.


    • Digg This!    StumbleUpon Toolbar StumbleUpon    Bookmark with Delicious Del.icio.us   


    RELATED CONTENT
    VPN Troubleshooting
    How to maintain corporate VPN connection while printing to a private network.
    Can I set up a VPN on my wireless router?
    How can I get our VPN to work on Windows Vista?
    To set up a VPN server, do you need two NIC cards?
    How do I connect to our VPN with authentication ID?
    What causes my overseas VPN connection to slow during the day?
    Why has the terminal server ended my connection?
    How can I access each device from my network while keeping the companies' networks secure?
    VPN operating system interoperability -- Configure VPNs with Windows, Checkpoint
    VPN operating system interoperability -- configure VPNs with Unix

    VPNs with Lisa Phifer
    Would you consider a Microsoft VPN tunnel through a WEP encrypted access point to be secure?
    I've heard rumors that some service providers can see unencrypted VPN traffic of their customers. Is this true?
    I need to select a Cisco ADSL router which is capable of acting as a VPN server for Microsoft VPN clients that come through the Internet.
    What about using SSL VPN with e-mail clients?
    Can you have two VPN connections to the same machine simultaneously?
    Why can't I access my folders on the server through the VPN?
    I need a very basic VPN solution to connect two offices to allow two servers to talk to one another.
    After setting up my wireless router, I can no longer get on the VPN.
    Can one use VPN over a peer-to-peer network within a home?
    Why can't I access my company's VPN?

    RELATED GLOSSARY TERMS
    Terms from Whatis.com − the technology online dictionary
    virtual systems management  (SearchNetworking.com)
    VPN appliance  (SearchNetworking.com)

    RELATED RESOURCES
    2020software.com, trial software downloads for accounting software, ERP software, CRM software and business software systems
    Search Bitpipe.com for the latest white papers and business webcasts
    Whatis.com, the online computer dictionary



    Search and Browse the Expert Answer Center
    Search and browse more than 25,000 question and answer pairs from more than 250 TechTarget industry experts.
    Browse our Expert Advice



    Expert networking advice and tips for IT professionals
    Visit KnowledgeStorm's comprehensive and easy to use business white paper directory.
    HomeNewsTopicsITKnowledge ExchangeTipsAsk the ExpertsMultimediaWhite PapersNetworking Product Trials
    About Us  |  Contact Us  |  For Advertisers  |  For Business Partners  |  Site Index  |  RSS
    SEARCH 
    TechTarget provides enterprise IT professionals with the information they need to perform their jobs - from developing strategy, to making cost-effective IT purchase decisions and managing their organizations' IT projects - with its network of technology-specific Web sites, events and magazines.

    TechTarget Corporate Web Site  |  Media Kits  |  Reprints  |  Site Map




    All Rights Reserved, Copyright 2000 - 2008, TechTarget | Read our Privacy Policy     		  TechTarget - The IT Media ROI Experts