VPNC

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Revision as of 16:02, 17 September 2007 (edit)
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(publication of my vpnc auto-reconnect script)
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(This page describes how to use DD-WRT to connect to a Cisco VPN Concentrator using vpnc.)
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== This page describes how to use DD-WRT to connect to a Cisco VPN Concentrator using vpnc. == == This page describes how to use DD-WRT to connect to a Cisco VPN Concentrator using vpnc. ==
 +
 +vpnc is supposed to work with:
 +*Cisco VPN concentrator 3000 Series
 +*Cisco IOS routers
 +*Cisco PIX / ASA Zecurity Appliances
 +*Juniper/Netscreen
 +
There is currently no gui for this, but don't worry, it won't be complicated. There is currently no gui for this, but don't worry, it won't be complicated.
This script also automatically reconnects, if your vpn connection gets disconnected This script also automatically reconnects, if your vpn connection gets disconnected
 +
 +To let your router connect to the vpn concentrator and share the connection with its clients follow the steps below:
#You need to flash DD-WRT VPN build after 08/18/07 (I recommend latest v24 vpn). #You need to flash DD-WRT VPN build after 08/18/07 (I recommend latest v24 vpn).

Revision as of 21:21, 21 September 2007

This page describes how to use DD-WRT to connect to a Cisco VPN Concentrator using vpnc.

vpnc is supposed to work with:

  • Cisco VPN concentrator 3000 Series
  • Cisco IOS routers
  • Cisco PIX / ASA Zecurity Appliances
  • Juniper/Netscreen


There is currently no gui for this, but don't worry, it won't be complicated. This script also automatically reconnects, if your vpn connection gets disconnected

To let your router connect to the vpn concentrator and share the connection with its clients follow the steps below:

  1. You need to flash DD-WRT VPN build after 08/18/07 (I recommend latest v24 vpn).
  2. Paste the code below into a text editor and adjust line 5 - 11.
  3. Open a Webbrowser, type the IP of your router, then go to Administration -> Commands
  4. Paste the code adjusted in Step 2 into the commands box, then click 'Save Startup'
  5. Reboot your router

If everything worked fine, your router has now established a vpn tunnel.

If you have any comment or question on this, you can PM me in the DD-WRT Forum (Username: alain)

mkdir /tmp/etc/vpnc
rm -f /tmp/etc/vpnc/vpnc.sh
echo '
#!/bin/sh 
vpn_concentrator="host" ##enter ip or hostname of your Ipsec vpn concentrator
vpn_keepalive_host1="keepalive1"        ##enter the ip or hostname of a computer that should be reachable if vpn connection is established.
vpn_keepalive_host2="keepalive2"        ##enter the ip or hostname of a computer that should be reachable if vpn connection is established.
vpn_groupname="grid"  ##enter the group name here
vpn_grouppasswd="grppasswd"   ##enter the group password here
vpn_username="username"       ##enter your username here
vpn_password="password"        ##enter your password here

#--do not edit this--
#Written by Alain R. (alainr [AT] gmx.de) 17.Sep.2007
rm -f /tmp/etc/vpnc/vpn.conf
vpnc-disconnect
echo "
IPSec gateway $vpn_concentrator
IPSec ID $vpn_groupname
IPSec secret $vpn_grouppasswd
Xauth username $vpn_username
Xauth password $vpn_password
" >> /tmp/etc/vpnc/vpn.conf


pingtest1 () {
 ping -q -c1 $param1 >> /dev/null
 if [ "$?" == "0" ]; then
       echo 0 #reachable 
	
 else
	echo 1 #not reachable
 fi
}

pingtest2 () {
 ping -q -c2 $param2 >> /dev/null
 if [ "$?" == "0" ]; then
       echo 0 #reachable 
	
 else
	echo 1 #not reachable
 fi
}

while [ true ]; do
	param1=$vpn_concentrator;
	if [ "`pingtest1`" == "0" ]; then  #Vpn concentrator reachable
		doloop=1;
		while [ $doloop -gt 0 ]; do
			param1=$vpn_keepalive_host1;
			
			if [ "`pingtest1`" == "0" ]; then
				sleep 300
			else
				param2=$vpn_keepalive_host2;
				if [ "`pingtest2`" == "0" ]; then
					sleep 300
				else
					doloop=0;
					vpnc-disconnect
					vpnc /tmp/etc/vpnc/vpn.conf
					sleep 1
					tundev="`ifconfig |grep tun |cut -b 1-4`"
					iptables -A FORWARD -o $tundev -j ACCEPT
					iptables -A FORWARD -i $tundev -j ACCEPT
					iptables -t nat -A POSTROUTING -o $tundev -j MASQUERADE
					sleep 9
				fi
			fi
		done
	else
	sleep 10;
	fi
     
done

return 0;
' >> /tmp/etc/vpnc/vpnc.sh
chmod 700 /tmp/etc/vpnc/vpnc.sh
/tmp/etc/vpnc/vpnc.sh&