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Thread: Unable to restore VPN connection

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  1. #1
    Join Date
    Mar 2010
    Beans
    2

    Unable to restore VPN connection

    I am trying to keep a VPN connection open between two Ubuntu 8.04 LTS servers, one in Holland and one in China. Unfortunately, because the connection in China is not great, about 1 time a day the connection drops. I have therefore devised a script, to be started by crontab once every 5 minutes, that checks the connection and if necessary restores it.

    Code:
    #!/bin/bash
    ping -c 2 -W 10  10.10.10.73 &> /dev/null;
    PING = $?;
    if [ "$PING"-ne 0]; then
      # Restart pptp connection
      killall pppd;
      sleep 30;
      /usr/sbin/pppd call pptpvpn;
    fi
    The script works fine when I start it from the shell but, unfortunately, when starting from cron it generates the following error messages in syslog:


    bluebuntu /USR/SBIN/CRON[29540]: (root) CMD (/usr/local/bin/checkvpn > /tmp/checkvpn.log 2>&1)
    bluebuntu pppd[29551]: pppd 2.4.4 started by root, uid 0
    bluebuntu pppd[29551]: Couldn't get channel number: Input/output error
    bluebuntu last message repeated 9 times
    bluebuntu pppd[29551]: Exit.

    In which bluebuntu is my server's name.

    Any ideas on why this is happening? I would help me a lot if someone would provide a solution for this issue.

    Thanks,
    Bob


    P. S. My script in /etc/init.d is:

    Code:
    #!/bin/bash
       
    function routeadd {
       route add -net 10.10.10.0 netmask 255.255.255.0 dev ppp0
       route add -net 10.10.10.73 netmask 255.255.255.255 dev ppp0
    }
    function makepptp {
      echo pty \"pptp mycompany.nl --nolaunchpppd\" >> /etc/ppp/peers/pptpvpn;
      echo remotename PPTP >> /etc/ppp/peers/pptpvpn;
      echo require-mppe-128 >> /etc/ppp/peers/pptpvpn;
      echo file /etc/ppp/options.pptp >> /etc/ppp/peers/pptpvpn;
      echo ipparam pptpvpn >> /etc/ppp/peers/pptpvpn;
      echo persist >> /etc/ppp/peers/pptpvpn;
      echo usepeerdns >> /etc/ppp/peers/pptpvpn;
      pppd call pptpvpn > /tmp/pptpvpn.log 2>&1 &
    }
       
    if [ -e /etc/ppp/peers/pptpvpn ]; then
      rm /etc/ppp/peers/pptpvpn;
      echo name myvpn >> /etc/ppp/peers/pptpvpn;
      makepptp;
      sleep 12;
      routeadd;
    else
      echo name myvpn >> /etc/ppp/peers/pptpvpn;
      makepptp;
      sleep 12;
      routeadd;
    fi
    Last edited by ZuperB; March 4th, 2010 at 09:57 PM. Reason: removed URL

  2. #2
    Join Date
    Mar 2010
    Beans
    2

    Re: Unable to restore VPN connection

    Guys, do I have to figure out everything by myself?


    Anyway, I found a solution that works. This is my new script /usr/local/bin/checkvpn:


    Code:
    #!/bin/bash
      
    function routeadd {
        /sbin/route add -net 10.10.10.0 netmask 255.255.255.0 dev  ppp0
        /sbin/route add -net 10.10.10.73 netmask 255.255.255.255  dev ppp0
    }
      
    ping -c 2 -W 10 10.10.10.73 &>  /dev/null;
    PING=$?;
    if [ "$PING" -ne 0 ]; then
         # Restart pptp connection
         /sbin/ifdown ppp0
         sleep 5;
         /sbin/ifup ppp0
         sleep 30;
         routeadd;
         sleep 3;
    fi
    To make this work, I had to add the details for the ppp0 interface to the file /etc/network/interfaces by adding the following lines.

    Code:
    auto ppp0
    iface ppp0 inet ppp
         provider pptpvpn

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