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VPN dropping

  • 14-09-2011 11:46pm
    #1
    Stainless_Steel
    Closed Accounts Posts: 1,155 ✭✭✭


    Hi,

    Hope someone can help me.

    My VPN connection between iPhone and Windows 7 keeps dropping after a minute or so while using 3G/Edge. No issues with Wifi.

    Packet sniffing shows that at the point of disconnection, the server sends a RST (reset) flag in the frame. The client then sends an echo request and some more PPP compressed packets until it sees it won't be getting a reply, then duly terminates the PPP through LCP.

    My questions are:

    1. Why would this only happen over cellular data network and not Wifi? (I've held a 30 min WiFi VPN connection, but max. 1 minute with 3G/Edge).

    2. Should the client be handling the RST better?

    3. Any Win7 experts know where I can find logs that may tell me why the RST flag is being set?

    Thanks!


Comments

  • #2
    rolion
    Closed Accounts Posts: 3,362 ✭✭✭rolion


    TBH,you've lost me with so many techie terms !!
    What exactly are you missing with so many hands-on information...

    Try another phone,try another VPN client,try another Win7 end !
    Try another mast,another ISP,another mobile network.

    Is 3G so reliable for VPN traffic shape ??? Dunno...


  • #3
    Stainless_Steel
    Closed Accounts Posts: 1,155 ✭✭✭Stainless_Steel


    rolion wrote: »
    TBH,you've lost me with so many techie terms !!
    What exactly are you missing with so many hands-on information...

    Try another phone,try another VPN client,try another Win7 end !
    Try another mast,another ISP,another mobile network.

    Is 3G so reliable for VPN traffic shape ??? Dunno...

    Hi, thanks for reply.

    I think you're right, I need to try with a different mobile network provider!

    I've come to the conclusion that the server is terminating the connection (setting a reset flag) because it's not receiving acknowledgements (ack flag) from the client (phone). I know this because there is a tcp packet retransmitting every 5-6 seconds. A retransmit never happens when using wifi. Basically the bandwidth/latency time of cellular data is just not suitable for VPN. At least not from whatever mast I connect to from my bedroom.

    Would be interested to know if anyone else uses VPN over a non-wifi connection?


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