Pptp and L2TP VPN, Configuring Pptp, 207 | Fortinet 100 specification

FortiGate-100 Installation and Configuration Guide Version 2.50 MR2

PPTP and L2TP VPN

You can use PPTP and L2TP to create a virtual private network (VPN) between a remote client PC running the Windows operating system and your internal network. Because they are is a Windows standards, PPTP and L2TP do not require third-party software on the client computer. So long as the Internet Service Provider supports PPTP and L2TP connections, you can create a secure connection by making relatively simple configuration changes to the client computer and the FortiGate unit.

This chapter provides an overview of how to configure FortiGate PPTP and L2TP VPN. For a complete description of FortiGate PPTP and L2TP, see the FortiGate VPN Guide.

This chapter describes:

•Configuring PPTP

•Configuring L2TP

Configuring PPTP

As its name suggests, PPTP involves the Point-to-Point protocol. PPTP packages data within PPP packets and then encapsulates the PPP packets within IP packets for transmission through a VPN tunnel.

Note: PPTP VPNs are only supported in NAT/Route mode.

This section describes:

•Configuring the FortiGate unit as a PPTP gateway

•Configuring a Windows 98 client for PPTP

•Configuring a Windows 2000 client for PPTP

•Configuring a Windows XP client for PPTP

FortiGate-100 Installation and Configuration Guide

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Fortinet 100 user manual Pptp and L2TP VPN, Configuring Pptp, 207

Contents

August Installation and Configuration Guide Regulatory Compliance Trademarks Table of Contents NAT/Route mode installation System status Virus and attack definitions updates and registration RIP configuration 121 Users and authentication 173 IPSec VPN 181 Network Intrusion Detection System Nids 221 Glossary 259 Index 263 Contents Antivirus protection Introduction Email filtering Web content filtering Firewall NAT/Route mode Network intrusion detection Transparent mode Web-based manager Secure installation, configuration, and management FortiGate web-based manager and setup wizard Command line interface Logging and reporting System administrationNetwork configuration What’s new in Version Firewall Replacement messagesUsers and authentication Dhcp server Antivirus Web FilterEmail filter About this document Document conventions Comments on Fortinet technical documentation Fortinet documentation Customer service and technical support Comments on Fortinet technical documentation Getting started Mounting Package contents Environmental specifications Powering on Connecting to the web-based manager Connecting to the web-based manager Stop bits Flow control Connecting to the command line interface CLIFactory default FortiGate configuration settings Bits per second 9600 Data bits Parity External interface Factory default NAT/Route mode network configurationAccount Internal interface Factory default firewall configuration Factory default Transparent mode network configuration Antivirus & Web Filter Factory default content profilesFactory default firewall configuration Traffic Shaping Authentication Scan content profile Options Strict content profileScan content profile Strict content profile Options Unfiltered content profile Options Web content profileUnfiltered content profile Web content profile Options Example NAT/Route mode network configuration Planning your FortiGate configuration Example NAT/Route multiple internet connection configuration NAT/Route mode with multiple external network connections Setup Wizard Configuration options FortiGate model maximum values matrix Next steps Configuration options Getting started NAT/Route mode installation Preparing to configure NAT/Route modeInternal servers Dhcp server Advanced NAT/Route mode settingsAdvanced FortiGate NAT/Route mode settings DMZ interface Using the command line interface Using the setup wizard Set system interface external mode static ip 204.23.1.5 FortiGate-100 NAT/Route mode connections Connecting the FortiGate unit to your networks Setting the date and time Configuring your networksCompleting the configuration Configuring the DMZ interface Registering your FortiGate Configuration example Multiple connections to the InternetConfiguring virus and attack definition updates Enabling antivirus protection Example multiple Internet connection configuration Destination based routing examples Configuring Ping serversPrimary and backup links to the Internet Using the CLI Load sharing and primary and secondary connections Load sharing Routing table should have routes arranged as shown in Table Adding the routes using the CLI Policy routing examples Routing a service to an external network Action Accept Adding a redundant default policyFirewall policy example Adding more firewall policies Restricting access to a single Internet connection DNS Settings Transparent mode installationPreparing to configure Transparent mode Transparent mode settings Administrator Password Go to System Status Changing to Transparent mode Configure the Transparent mode default gateway Configuring the Transparent mode management IP address FortiGate-100 Transparent mode connections Setting the date and time Default routes and static routes Transparent mode configuration examples Default route to an external network General configuration steps Go to System Network Routing Web-based manager example configuration stepsCLI configuration steps Go to System Network Management Static route to an external destination Set system route number 1 dst 24.102.233.5 255.255.255.0 gw1 Example static route to an internal destination Set system route number 1 dst 172.16.1.11 255.255.255.0 gw1 System status System status Firmware upgrade procedures Procedure Description Changing the FortiGate host nameChanging the FortiGate firmware Upgrade to a new firmware version Upgrading the firmware using the web-based managerUpgrading the firmware using the CLI Revert to a previous firmware version Execute restore image namestr tftpip Reverting to a previous firmware version using the CLI Execute ping To install firmware from a system reboot Install a firmware image from a system reboot using the CLI Press Any Key To Download Boot Image Restoring your previous configuration Test a new firmware image before installing it Test a new firmware image before installing it Installing a backup firmware image Installing and using a backup firmware image Installing and using a backup firmware image Switching to the backup firmware image Switching back to the default firmware image Manual virus definition updates Displaying the FortiGate up time Manual attack definition updatesBacking up system settings Displaying the FortiGate serial number Restoring system settings to factory defaults Restoring system settings Changing to Transparent mode Changing to NAT/Route modeRestarting the FortiGate unit Shutting down the FortiGate unit System statusViewing CPU and memory status Go to System Status Monitor Viewing sessions and network status Sessions and network status monitor Viewing virus and intrusions status Viewing the session list Go to System Status Session Session list To IP Updating antivirus and attack definitions Virus and attack definitions updates and registration Version Expiry date Last update attempt Last update status Connecting to the FortiResponse Distribution Network Go to System Update Configuring scheduled updates Configuring update logging Go to Log&Report Log SettingSuccessful Update FDN error Configuring push updates Adding an override serverManually updating antivirus and attack definitions Push updates through a NAT device To enable push updatesAbout push updates Push updates and external dynamic IP addresses Example network topology Push updates through a NAT device Example push updates through a NAT device Go to Firewall Virtual IP General procedure Adding a firewall policy for the port forwarding virtual IP Schedule Always Service ANY Action Accept 100 Scheduled updates through a proxy server FortiCare Service Contracts Registering FortiGate units101 102 Registering the FortiGate unit Registering a FortiGate unit product information 103 104 Recovering a lost Fortinet support passwordUpdating registration information Viewing the list of registered FortiGate units Registering a new FortiGate unit Adding or changing a FortiCare Support Contract number105 106 Changing your Fortinet support passwordDownloading virus and attack definitions updates Changing your contact information or security question 107 Registering a FortiGate unit after an RMA 108 Network configuration Configuring interfaces109 Adding a secondary IP address to an interface Viewing the interface listBringing up an interface Changing an interface static IP address Controlling management access to an interface Adding a ping server to an interface111 Configuring traffic logging for connections to an interface Configuring the external interface with a static IP addressConfiguring the external interface for Dhcp 113 Configuring the external interface for PPPoE Configuring the management interface Transparent mode Go to System Network DNS Configuring routingAdding DNS server IP addresses 115 Adding destination-based routes to the routing table Adding a default route 117 Adding routes in Transparent mode Policy routing Configuring the routing table Go to System Network Dhcp Providing Dhcp services to your internal networkPolicy routing command syntax 119 120 Viewing the dynamic IP list 121 RIP configuration RIP settings Go to System RIP Settings122 Holddown Update123 Invalid Mode Configuring RIP for FortiGate interfacesPassword 124 Adding RIP neighbors 125Adding RIP neighbors Go to System RIP Neighbor Go to System RIP Filter Adding RIP filtersAdding a single RIP filter 126 Mask Add the netmask of the route Action Adding a RIP filter list127 Add the IP address of the route Adding a neighbors filter Adding a routes filter128 129 System configurationSetting system date and time To set the date and time Go to System Config Time To set the system idle timeout Changing web-based manager options130 To select a language for the web-based manager To set the Auth timeoutTo modify the Dead Gateway Detection settings 131 132 Adding and editing administrator accountsAdding new administrator accounts Go to System Config Admin Editing administrator accounts To edit an administrator account Go to System Config Admin133 Go to System Config Snmp v1/v2c Configuring SnmpConfiguring the FortiGate unit for Snmp monitoring Configuring FortiGate Snmp support FortiGate MIBs MIB file name Description EtherLike.mib FortiGate MIBs135 Trap Community Trap Receiver IP Addresses FortiGate traps Trap message Description Customizing replacement messagesFortiGate traps 136 Customizing replacement messages Go to System Config Replacement Messages137 Customizing alert emails 138Alert email message sections Alert email message sections 139 140 141 Firewall configuration Default firewall configuration Addresses142 143 ServicesContent profiles Schedules Adding firewall policies 144Go to Firewall Policy 145 Dynamic IP Pool Fixed Port VPN TunnelTraffic Shaping 146 Authentication Anti-Virus & Web filter147 Log Traffic Comments148 149 Configuring policy listsPolicy matching in detail Changing the order of policies in a policy list Enabling a policy AddressesEnabling and disabling policies Disabling a policy Adding addresses 151Go to Firewall Address 152 Editing addressesDeleting addresses Organizing addresses into address groups Services Predefined services153 ANY 154 IRC 155 Go to Firewall Service Group Providing access to custom servicesGrouping services Go to Firewall Service Custom 157 Schedules Go to Firewall Schedule One-time Creating one-time schedulesCreating recurring schedules 158 159 Adding a schedule to a policy Virtual IPs Adding static NAT virtual IPs160 161 Adding port forwarding virtual IPs 162 163 Adding policies with virtual IPs Go to Firewall IP Pool IP poolsAdding an IP pool 164 IP Pools for firewall policies that use fixed ports IP pools and dynamic NAT165 Go to Firewall IP/MAC Binding Static IP/MAC Go to Firewall IP/MAC Binding SettingIP/MAC binding 166 167 Adding IP/MAC addresses Go to Firewall IP/MAC Binding Dynamic IP/MAC Viewing the dynamic IP/MAC listEnabling IP/MAC binding 168 169 Content profiles 170 Default content profilesAdding a content profile Go to Firewall Content Profile Adding a content profile to a policy 171Oversized File/Email Block Pass Fragmented Email 172 173 Users and authentication 174 Setting authentication timeoutAdding user names and configuring authentication Adding user names and configuring authentication 175 Deleting user names from the internal database 176 Configuring Radius supportAdding Radius servers Deleting Radius servers Go to User Ldap Configuring Ldap supportAdding Ldap servers 177 178 Deleting Ldap servers Go to User User Group Configuring user groupsAdding user groups 179 180 Deleting user groups 181 IPSec VPN AutoIKE with certificates Key managementManual Keys AutoIKE with pre-shared keys 183 General configuration steps for a manual key VPNManual key IPSec VPNs Adding a manual key VPN tunnel 184 AutoIKE IPSec VPNs General configuration steps for an AutoIKE VPNAdding a phase 1 configuration for an AutoIKE VPN Go to VPN Ipsec Phase 186 Remote Gateway Static IP AddressRemote Gateway Dialup User 187 Configuring advanced options 188 189 Adding a phase 2 configuration for an AutoIKE VPN 190 Managing digital certificates Obtaining a signed local certificate191 Generating the certificate request 192Go to VPN Local Certificates Downloading the certificate request Requesting the signed local certificate193 Retrieving the signed local certificate Importing the signed local certificate194 195 Obtaining a CA certificateRetrieving a CA certificate Importing a CA certificate 196 Configuring encrypt policies 197 Adding a source addressAdding a destination address Adding an encrypt policy Adding an encrypt policy 198 VPN concentrator hub general configuration steps IPSec VPN concentrators199 Source InternalAll Destination VPN spoke address Action 200 Adding a VPN concentrator 201Go to VPN IPSec Concentrator Policies VPN spoke general configuration steps202 VPN Tunnel Configuring redundant IPSec VPN Redundant IPSec VPNs203 204 See Adding a phase 1 configuration for an AutoIKE VPN on 205 Monitoring and Troubleshooting VPNsViewing VPN tunnel status Viewing dialup VPN connection status Testing a VPN 206Go to VPN IPSec Dialup Configuring Pptp Pptp and L2TP VPN207 208 Configuring the FortiGate unit as a Pptp gatewayAdding users and user groups Enabling Pptp and specifying an address range 209 Adding an address group Adding a firewall policy Configuring a Windows 98 client for PptpInstalling Pptp support Go to Start Settings Control Panel Network 211 Configuring a Pptp dialup connectionConnecting to the Pptp VPN Configuring a Windows 2000 client for Pptp Go to Start Control Panel Configuring a Windows XP client for PptpConfiguring the VPN connection 212 213 Configuring L2TP Go to VPN L2TP L2TP Range Configuring the FortiGate unit as a L2TP gatewayEnabling L2TP and specifying an address range 214 215 Sample L2TP address range configuration 216 217 Configuring a Windows 2000 client for L2TPConfiguring an L2TP dialup connection Disabling IPSec Go to Start Settings Connecting to the L2TP VPNConfiguring a Windows XP client for L2TP Configuring an L2TP VPN dialup connection 219 220 Network Intrusion Detection System Nids Detecting attacks221 222 Configuring checksum verificationSelecting the interfaces to monitor Disabling the Nids Go to Nids Detection Signature List Viewing the signature listViewing attack descriptions 223 Go to Nids Detection User Defined Signature List Enabling and disabling Nids attack signaturesAdding user-defined signatures 224 225 Preventing attacksDownloading the user-defined signature list Enabling Nids attack prevention Setting signature threshold values Enabling Nids attack prevention signatures226 227 Logging attack messages to the attack log Configuring synflood signature valuesValue Description Minimum Maximum Default Logging attacks 229 Reducing the number of Nids attack log and email messagesAutomatic message reduction Manual message reduction 230 General configuration steps Antivirus protection231 Antivirus scanning 232To scan FortiGate firewall traffic for viruses 233 File blockingBlocking files in firewall traffic Adding file patterns to block Viewing the virus list Configuring limits for oversized files and emailBlocking oversized files and emails Exempting fragmented email from blocking 235 Web filtering 236 Content blockingGo to Web Filter Content Block Adding words and phrases to the banned word list 237 Using the FortiGate web filterURL blocking Adding URLs or URL patterns to the block list 238 Clearing the URL block list Downloading the URL block list Uploading a URL block list239 240 Using the Cerberian web filterInstalling a Cerberian license key on the FortiGate unit Adding a Cerberian user to the FortiGate unit Enabling Cerberian URL filtering Configuring Cerberian web filterAbout the default group and policy To configure the Cerberian web filtering 242 Script filteringEnabling the script filter Selecting script filter options Go to Web Filter Exempt URL Exempt URL listAdding URLs to the exempt URL list 243 244 245 Email filter Go to Email Filter Content Block Email banned word list246 247 Email block listEmail exempt list Adding address patterns to the email block list 248 To add a subject tag Go to Email Filter ConfigAdding a subject tag Adding address patterns to the email exempt list Logging and reporting Recording logs249 Recording logs on a remote computer Recording logs on a NetIQ WebTrends server250 Filtering log messages Recording logs in system memory251 252 Example log filter configuration Enabling traffic logging for a firewall policy Configuring traffic loggingEnabling traffic logging Enabling traffic logging for an interface 254 Configuring traffic filter settingsGo to Log&Report Log Setting Traffic Filter Adding traffic filter entries 255 Destination IP Address Destination Netmask ServiceViewing logs saved to memory Viewing logs 256 Configuring alert emailSearching logs Adding alert email addresses Go to Log&Report Alert Mail Categories Testing alert emailEnabling alert email 257 258 259 Glossary 260 261 262 263 Index Index 264 FDS 265 Ldap 266 MIB 267 RMA 268 TCP 269 UDP 270 271 272