SnapGear 1.7.8 manual Virtual Private Networking

Page 81

To determine the current SnapGear appliance’s PPTP server IP address, select Diagnostics from the System menu in the main menu bar. The IP address is displayed in the VPN field. Your remote users must know this PPTP IP address to setup a VPN tunnel to the SnapGear appliance.

Check that the remote PC has a modem installed and that you have a local ISP account, (i.e. an ISP phone number and a username and password to log in to the ISP). Although users are often connected to the Internet using a dial-out modem, VPN connection can also be set up using a cable modem, ADSL, ISDN or other Internet link.

Ensure that both the VPN and Dial Up Networking (DUN) software is installed on the remote PC. If necessary, install the Microsoft DUN update (available on the SnapGear Installation CD) and VPN Client update.

To create a VPN connection across the Internet, you must set up two networking connections. One connection is for the Internet access provider, and the other connection is for the VPN tunnel to your office network. Verify that a networking connection is established for the link to your local ISP.

Set up a new connection for the VPN connection. Your SnapGear appliance’s PPTP server will operate with the standard Windows PPTP clients in all versions of Windows.

The following sections provide details for client setup in Windows 95/98, Windows NT, and Windows 2000. Setup instructions for Windows ME and Windows XP can be deduced from this information and the Microsoft Windows documentation.

78

Virtual Private Networking

Image 81

Contents Rev May 2nd Table of contents Virtual Private Networking Introduction Term Meaning TerminologyLAN TCP/IP Document conventionsStep Chapter Installing and configuring your SnapGear applianceYour SnapGear appliance LEDsLabel Activity Description SnapGear appliance back panels Network interconnections Software features SnapGear appliance featuresInternet link features LAN link featuresDial-in connection features Environmental features Getting started Static IP reset10.0.0.0 10.255.255.255 10/8 prefix New Networks192.168.0.0 192.168.0.255 192.168.0/24 prefix Configuring the SnapGear appliance on your network Page Set up IP addresses Multiple SnapGear appliances were found on the network Your SnapGear appliance was found on the networkYour SnapGear appliance needs an IP address SnapGear Management Console web administration pages Administrative passwordUsing linsetip Initial setup using LinuxPing -b subnet broadcast address Arp -a Using an existing local Dhcp or Bootp serverEdit the /etc/inetd.conf file Configuring a new local Dhcp or Bootp serverSnapGear Quick Setup LAN port quick setup LAN port quick setupISP connection quick setup ISP connection quick setupGetting started Configuring the PCs on your network TCP/IP properties Physically connect modem device Connecting to the InternetSelect Internet connection Connect to Internet cable modemConnect to Internet Adsl Connect to Internet modem Connect to Internet directField Description ISP. The Password and Confirm Password fields mustInternet failover Advanced configuration optionFollowing figure shows the failover configuration screen Failed connection Establishing the connection Configure PCs to use SnapGear appliance Internet gatewayDial-in server configuration Dial-in server configuration Dial-in setup Dial-in setupField Description Dial-in user account creation Dial-in user accountsFollowing figure shows the user maintenance screen Account list Dial-in password errorFor Windows 95 and Windows Remote user configurationServer types Connect to dialogue box WindowsClick Next to continue 11 Connection availability 13 Remote access login screen IP configuration Network configurationNetwork configuration Advanced IP configuration Advanced IP configurationNetwork configuration Dhcp server Dhcp server configurationNetwork configuration Advanced networking Traffic shapingAdditional routes Firewall Incoming accessIncoming access configuration Incoming access administration servicesConfigure external access to services External access to servicesPort forwarding Port forwarding configurationSecurity group classes configuration Outgoing accessFirewall rules Outgoing access settingsIntrusion detection and blocking Intrusion detection and blocking configurationPage Content filtering Content filtering Filtering Level Description Filtering levels and reportingVirtual Private Networking 1VPN tunneling using the Pptp serverPptp client setup Pptp client configuration Pptp server setup Pptp server setup Enable and configure the Pptp VPN serverField Description 4PPTP VPN server accounts screen Configuring user accounts for VPN serverVirtual Private Networking VPN Pptp IP address Configuring the remote VPN clientVirtual Private Networking Windows 95 and Windows VPN client setupYour VPN client is now set up correctly Windows NT Network and dial-up connections This displays the Destination Address window Connecting the remote VPN client 12 IPSec setup IPSec setup13 Add new IPSec connection Virtual Private Networking 14 Automatic keying setup Technique Description Aggressive mode phase 1 settingsIPSec interoperability Password SystemTime server Advanced DiagnosticsReset button Flash upgradeTechnical support Technical supportLED Pattern Status Action Appendix a LED status patternsAppendix B System Log Access LoggingEth0 Default DenyEth1 PppCreating Custom Log Rules Forward Iptables -I Forward -j LOG -i eth+ -o eth+ -p tcp Rate Limiting Administrative Access LoggingBoot Log Messages