"Network No Longer" Available During Wireless Tran

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by DocLarge, Sep 1, 2005.

  1. DocLarge

    DocLarge Super Moderator Staff Member Member

    I can't remembe if anyone has ever answered this question in this forum, so I'm just posting what I found as a solution, as far as VPN is concerned.

    I haven't been using vpn lately so I didn't really catch this until I needed to transfer 182MB to a friend's connection via quickvpn. My isp had changed technology from "data" to "ipstream" and this has altered the way I tranfer data through a vpn tunnel. Below is something I've just put together and added to the quickvpn setup guide. "This" is only an issue after you setup quickvpn and notice you can't upload documents from your side, yet, you can download from the connection:
    NOTE: If your ISP has recently changed from “data†to “ipstream†you may have to change the MTU from “auto†to “manual†in order to allow vpn data transfer. An indicator of change in ISP ethernet technology is when you try to transfer information across a tunnel and you get “Network is no longer available.†In this instance, the MTU is set “too high†(i.e., 1492) and isn’t able to “pass through†the segment at the distant end. Think of a 6 foot tall man trying to fit through a door made for a 4 foot child. By adjusting the MTU to suit the situation, you now have a means of assuring data gets through. I dropped the default from 1492 to 1450 (after switching to "Manual") and all is good again.

    Just to make sure we're clear, this may not be the answer all of the time when having vpn issues, but in this instance, this was "exactly" the "cause and fix" for me.

  2. DocLarge

    DocLarge Super Moderator Staff Member Member

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