Configuring a Dhcp relay agent, 158 | Fortinet FortiGate-800

Configuring DHCP services	Network configuration

Configuring a DHCP relay agent

In a DHCP relay configuration, the FortiGate unit forwards DHCP requests from DHCP clients through the FortiGate unit to a DHCP server. The FortiGate unit also returns responses from the DHCP server to the DHCP clients. The DHCP server must have a route to the FortiGate unit that is configured as the DHCP relay so that the packets sent by the DHCP server to the DHCP client arrive at the FortiGate performing DHCP relay.

To configure an interface as a DHCP relay agent

1Go to System > Network > DHCP.

2Select Service.

3Select the interface to be the DHCP relay agent.

4Select DHCP Relay Agent.

5Enter the DHCP Server IP address.

6Select Apply.

Configuring a DHCP server

As a DHCP server, the FortiGate unit dynamically assigns IP addresses to hosts located on connected subnets. You can configure a DHCP server for any FortiGate interface. You can also configure a DHCP server for more than one FortiGate interface. For each DHCP server configuration you can add multiple scopes (also called address scopes) so that the DHCP server can assign IP addresses to computers on multiple subnets.

Use these procedures to configure an interface as a DHCP server:

•Adding a DHCP server to an interface

•Adding scopes to a DHCP server

•Adding a reserve IP to a DHCP server

•Viewing a DHCP server dynamic IP list

Adding a DHCP server to an interface

To add a DHCP server to an interface

1Go to System > Network > DHCP.

2Select Service.

3Select an interface.

4Select DHCP Server.

5Select Apply.

Adding scopes to a DHCP server

If you have configured an interface as a DHCP server, the interface requires at least one scope (also called an address scope). The scope designates the starting IP and ending IP for the range of addresses that the FortiGate unit assigns to DHCP clients.

158	Fortinet Inc.

Image 158

Fortinet FortiGate-800 Configuring a Dhcp relay agent, Configuring a Dhcp server, Adding a Dhcp server to an interface

Contents

Installation and Configuration Guide January 15 Trademarks Regulatory Compliance Table of Contents NAT/Route mode installation High availability Virus and attack definitions updates and registration 117 Network configuration 137 System configuration 169 Users and authentication 223 IPSec VPN 231 Network Intrusion Detection System Nids 269 Email filter 303 Glossary 323 Index 327 Contents Introduction Flexibility demanded by large enterprises Web content filtering Antivirus protection Email filtering Firewall VLANs and virtual domains NAT/Route modeTransparent mode Network intrusion detection VPN High availability Secure installation, configuration, and management Web-based manager Command line interface Logging and reporting Document conventions Fortinet documentation Customer service and technical support Comments on Fortinet technical documentation Customer service and technical support Getting started Package contents Mounting Environmental specifications Powering onPower requirements To power on the FortiGate-800 unit Connecting to the web-based manager To connect to the web-based manager Bits per second 9600 Data bits Parity Connecting to the command line interface CLITo connect to the CLI Stop bits Flow control Account Factory default FortiGate configuration settingsFactory default NAT/Route mode network configuration Internal interface Factory default Transparent mode network configuration Factory default firewall configuration Factory default content profiles Strict content profile Scan content profile Options Scan content profileStrict content profile Options Web content profile Options Web content profileUnfiltered content profile Unfiltered content profile Options Planning the FortiGate configuration Example NAT/Route mode network configuration NAT/Route mode with multiple external network connections Example NAT/Route multiple internet connection configuration Configuration options Setup wizard FortiGate model maximum values matrix Front keypad and LCD Next steps Signatures Antivirus file Block patterns Web filter NAT/Route mode installation Preparing to configure NAT/Route mode Dhcp server Advanced NAT/Route mode settingsAdvanced FortiGate NAT/Route mode settings Reconnecting to the web-based manager Using the setup wizardStarting the setup wizard DMZ and user-defined interfaces Configuring the FortiGate unit to operate in NAT/Route mode Using the front control buttons and LCDUsing the command line interface Configuring NAT/Route mode IP addresses Set system interface external mode static ip 204.23.1.5 Connecting the FortiGate unit to your networks To connect the FortiGate unit running in NAT/Route mode FortiGate-800 External To connect to FortiGate-800 user-defined interfaces Configuring your networks Example FortiGate-800 user-defined interface connections Configuring interfaces 1 to Completing the configurationConfiguring the DMZ interface Setting the date and time Registering your FortiGate unit Configuration example Multiple connections to the InternetConfiguring virus and attack definition updates Configuring ping servers Internal Destination-based routing examples Using the CLIPrimary and backup links to the Internet Go to System Network Routing Table Load sharing Load sharing and primary and secondary connections To add the routes using the CLI Routing table should have routes arranged as shown in Table Routing a service to an external network Policy routing examples Firewall policy example Adding a redundant default policyDestination DMZAll Schedule Always Service Adding more firewall policies Restricting access to a single Internet connection Configuration example Multiple connections to the Internet Transparent mode settings Administrator Password Transparent mode installationPreparing to configure Transparent mode DNS Settings Changing to Transparent mode using the web-based manager Go to System Status Changing to Transparent mode using the CLI Operation mode Transparent Enabling antivirus protection Configuring the Transparent mode management IP addressConfigure the Transparent mode default gateway Connecting the FortiGate unit to your networks Transparent mode configuration examples FortiGate-800 Default routes and static routes Example default route to an external network General configuration steps Default route to an external network Example static route to an external destination Web-based manager example configuration stepsCLI configuration steps Go to System Network Management DMZ Example static route to an internal destination FortiGate-800 Set system route number 1 dst 172.16.1.11 255.255.255.0 gw1 Transparent mode configuration examples High availability To configure a FortiGate unit for HA operation Configuring an HA clusterConfiguring FortiGate units for HA operation Go to System Config HA Hub Weighted Round RobinNone Least Connection Connecting the cluster Example Active-Active HA configuration HA network configuration To connect the cluster To add a new unit to the cluster Managing an HA clusterAdding a new FortiGate unit to a functioning cluster Configuring cluster interface monitoring Viewing the status of cluster members Monitoring cluster members To set the update frequency Example cluster CPU, memory, and hard disk display Viewing cluster sessions Viewing and managing cluster log messages Managing individual cluster units Monitoring cluster units for failoverViewing cluster communication sessions To set the host name of each cluster member Changing cluster unit host namesTo manage a cluster unit Synchronizing the cluster configuration Keyword Description Upgrading firmware Selecting a FortiGate unit as a permanent primary unit Advanced HA optionsReplacing a FortiGate unit after failover To select a permanent primary unit Configuring weighted-round-robin weights To set the priority of each FortiGate unit in a cluster Active-Active cluster packet flow Active-active HA packet flow NAT/Route mode packet flow Transparent mode packet flow Active-Active cluster packet flow System status System status Changing the FortiGate firmware Firmware upgrade procedures Procedure DescriptionChanging the FortiGate host name To change the FortiGate host name Go to System Status To upgrade the firmware using the web-based manager Upgrading the firmware using the web-based managerUpgrading the firmware using the CLI To upgrade the firmware using the CLI Reverting to a previous firmware version Execute ping Reverting to a previous firmware version using the CLI To revert to a previous firmware version using the CLI To install firmware from a system reboot Press any key to enter configuration menu 100 101 Restoring the previous configurationTesting a new firmware image before installing it 102 To test a new firmware image 103 Installing and using a backup firmware imageInstalling a backup firmware image To install a backup firmware image 104 105 Switching to the backup firmware imageTo switch to the backup firmware image To switch back to the default firmware image Manual virus definition updatesSwitching back to the default firmware image To update the antivirus definitions manually Displaying the FortiGate serial number Manual attack definition updatesTo update the attack definitions manually 107 Displaying the FortiGate up time Backing up system settingsRestoring system settings Displaying log hard disk status To change to Transparent mode Go to System Status Restoring system settings to factory defaultsChanging to Transparent mode 109 Restarting the FortiGate unit Changing to NAT/Route modeTo change to NAT/Route mode Go to System Status Shutting down the FortiGate unit 111 System statusViewing CPU and memory status To view CPU and memory status Go to System Status Monitor Viewing sessions and network status CPU and memory status monitor Viewing virus and intrusions status 113 Session list To view the session list Go to System Status Session 115 Protocol 116 117 Virus and attack definitions updates and registrationUpdating antivirus and attack definitions Version Expiry date Last update attempt Last update status Connecting to the FortiResponse Distribution NetworkGo to System Update To make sure the FortiGate unit can connect to the FDN Manually initiating antivirus and attack definitions updates 119 Enabling scheduled updates Scheduling updatesConfiguring update logging 120 121 To add an override server Go to System UpdateAdding an override server 122 Enabling push updatesEnabling scheduled updates through a proxy server To enable push updates Go to System Update Enabling push updatesPush updates when FortiGate IP addresses change 123 124 Enabling push updates through a NAT deviceExample push updates through a NAT device General procedure 125 126 Adding a firewall policy for the port forwarding virtual IP To configure the FortiGate NAT deviceSchedule Always Service ANY Action Accept 127 Registering FortiGate units 128 FortiCare Service Contracts 129 Registering the FortiGate unit 130 Updating registration information 131 132 Recovering a lost Fortinet support passwordViewing the list of registered FortiGate units 133 Registering a new FortiGate unitAdding or changing a FortiCare Support Contract number 134 Changing your Fortinet support passwordChanging your contact information or security question Downloading virus and attack definitions updates 135 Registering a FortiGate unit after an RMA 136 137 Network configurationConfiguring zones Deleting zones Configuring interfacesAdding zones 138 Adding an interface to a zone Changing the administrative status of an interfaceViewing the interface list 139 140 Configuring an interface with a manual IP addressConfiguring an interface for Dhcp Configuring an interface for PPPoE 141 142 Adding a secondary IP address to an interfaceAdding a ping server to an interface Controlling administrative access to an interface 143 Changing the MTU size to improve network performance Configuring traffic logging for connections to an interfaceConfiguring the management interface in Transparent mode 144 Vlan overview 145 Rules for Vlan IP addresses VLANs in NAT/Route modeRules for Vlan IDs 146 147 Virtual domains in Transparent modeAdding Vlan subinterfaces To add Vlan subinterfaces Go to System Network Interface 148 FortiGate unit with two virtual domains Adding a virtual domain Configuring a virtual domainVirtual domain properties 149 150 Adding Vlan subinterfaces to a virtual domainAdding zones to virtual domains 151 To add a zone to a virtual domain Go to System Network Zone 152 Adding firewall policies for virtual domainsAdding addresses for virtual domains Go to Firewall Address Deleting virtual domains Configuring routingAdding DNS server IP addresses 153 Adding destination-based routes to the routing table Adding a default routeTo add a default route Go to System Network Routing Table 154 Adding routes in Transparent mode 155 156 Configuring the routing tablePolicy routing 157 Configuring Dhcp servicesPolicy routing command syntax Adding a Dhcp server to an interface Configuring a Dhcp relay agentConfiguring a Dhcp server Adding scopes to a Dhcp server 159 To add a scope to a Dhcp server Go to System Network Dhcp 160 Adding a reserve IP to a Dhcp serverViewing a Dhcp server dynamic IP list Selected scope 161 RIP configurationRIP settings Holddown 162Invalid Flush Configuring RIP for FortiGate interfaces 163 Example RIP configuration for an internal interface 164 165 Adding RIP filtersAdding a RIP filter list To add a RIP filter list Go to System RIP Filter 166 Assigning a RIP filter list to the neighbors filterAssigning a RIP filter list to the incoming filter Assigning a RIP filter list to the outgoing filter 167 168 To set the date and time Go to System Config Time System configurationSetting system date and time 169 Changing system options To set the system idle timeout Go to System Config OptionsTo set the Auth timeout Go to System Config Options 170 Modifying the Dead Gateway Detection settings 171 To add an administrator account Go to System Config Admin Adding and editing administrator accountsAdding new administrator accounts 172 To edit an administrator account Go to System Config Admin Configuring SnmpEditing administrator accounts 173 Configuring Snmp access to an interface Configuring the FortiGate unit for Snmp monitoringConfiguring FortiGate Snmp support Configuring Snmp community settings System Location 175System Name FortiGate MIBs 176 System traps FortiGate trapsGeneral FortiGate traps 177 Antivirus traps VPN trapsNids traps Logging traps Fortinet MIB fields System configuration and statusFirewall configuration 179 180 181 Replacement messagesLogging and reporting configuration Customizing replacement messages 182 Alert email message sections Customizing alert emails183 184 Alert email message sections Firewall configuration 185 Default firewall configuration 186 Zones InterfacesVlan subinterfaces 187 Addresses ServicesDefault addresses Interface Address Description Schedules 189 Content profilesAdding firewall policies To add a firewall policy Go to Firewall Policy 190 Firewall policy optionsSource Schedule ServiceDestination Action 192 VPN TunnelTraffic Shaping Dynamic IP Pool Fixed Port 193 AuthenticationAnti-Virus & Web filter Maximum Bandwidth Traffic Priority 194 Log TrafficComments 195 Configuring policy listsPolicy matching in detail Disabling policies Changing the order of policies in a policy listEnabling and disabling policies Enabling policies 197 AddressesAdding addresses To add an address Go to Firewall Address To edit an address Go to Firewall Address Editing addresses198 199 Deleting addressesOrganizing addresses into address groups To delete an address Go to Firewall Address 200 ServicesPredefined services 201 GRE 202 Ldap Adding custom TCP and UDP services 203 Grouping services Adding custom Icmp servicesAdding custom IP services 204 Schedules 205 Creating one-time schedules 206 Creating recurring schedules 207 208 Virtual IPsAdding schedules to policies To add a schedule to a policy Go to Firewall Policy To add a static NAT virtual IP Go to Firewall Virtual IP Adding static NAT virtual IPs209 Virtual IP External Interface examples Description Internal Adding port forwarding virtual IPs 210 211 To add a policy with a virtual IP Go to Firewall Policy Adding policies with virtual IPs212 213 IP poolsAdding an IP pool To add an IP pool Go to Firewall IP Pool IP pools and dynamic NAT IP/MAC bindingIP Pools for firewall policies that use fixed ports 214 215 Go to Firewall IP/MAC Binding Static IP/MAC Adding IP/MAC addresses 216 217 Viewing the dynamic IP/MAC listEnabling IP/MAC binding Content profiles 218 To add a content profile Go to Firewall Content Profile Default content profilesAdding content profiles 219 220 Oversized File/Email Pass Fragmented Email 221 Adding content profiles to policiesTo add a content profile to a policy Go to Firewall Policy 222 Users and authentication 223 Adding user names and configuring authentication Setting authentication timeoutAdding user names and configuring authentication To set authentication timeout Go to System Config Options Deleting user names from the internal database 225 Deleting Radius servers Configuring Radius supportAdding Radius servers 226 227 Configuring Ldap supportAdding Ldap servers To add an Ldap server Go to User Ldap To delete an Ldap server Go to User Ldap Deleting Ldap servers228 229 Configuring user groupsAdding user groups To add a user group Go to User User Group To delete a user group Go to User User Group Deleting user groups230 IPSec VPN 231 AutoIKE with pre-shared keys Key managementManual Keys AutoIKE with certificates Adding a manual key VPN tunnel General configuration steps for a manual key VPNManual key IPSec VPNs 233 AES192 234AES128 AES256 AutoIKE IPSec VPNs General configuration steps for an AutoIKE VPNAdding a phase 1 configuration for an AutoIKE VPN 235 Remote Gateway Dialup User 236Remote Gateway Static IP Address 237 Configuring advanced optionsTo configure phase 1 advanced options 238 Adding a phase 1 configuration Standard options 239 240 Adding a phase 2 configuration for an AutoIKE VPNTo add a phase 2 configuration Go to VPN Ipsec Phase Use wildcard selectors 241Use selectors from policy Generating the certificate request Managing digital certificatesObtaining a signed local certificate 242 Key Size 243Key Type 244 Downloading the certificate requestImporting the signed local certificate Importing CA certificates Configuring encrypt policiesObtaining CA certificates 245 To add a source address Go to Firewall Address Adding a source address246 247 Adding a destination addressAdding an encrypt policy To add a destination address Go to Firewall Address 248 IPSec VPN concentrators 249 250 VPN concentrator hub general configuration stepsTo create a VPN concentrator configuration Adding a VPN concentrator 251 252 VPN spoke general configuration stepsTo create a VPN spoke configuration Redundant IPSec VPNs 253 254 Configuring redundant IPSec VPNsTo configure a redundant IPSec VPN Viewing VPN tunnel status Monitoring and Troubleshooting VPNsTo view VPN tunnel status Go to VPN Ipsec Phase Viewing dialup VPN connection status Testing a VPN 256 257 Configuring PptpPptp and L2TP VPN To add users and user groups Configuring the FortiGate unit as a Pptp gateway258 To add a source address To add a destination address 259To add a source address group To add a firewall policy Configuring a Windows 98 client for Pptp 260 261 Configuring a Windows 2000 client for PptpConfiguring a Windows XP client for Pptp To connect to the Pptp VPN Select Properties Security To configure the VPN connection262 263 Configuring L2TPConfiguring the FortiGate unit as an L2TP gateway 264 To add source addresses Configuring a Windows 2000 client for L2TP 265 To connect to the L2TP VPN To disable IPSec266 Configuring a Windows XP client for L2TP 267 268 269 Network Intrusion Detection System NidsDetecting attacks Disabling monitoring interfaces Configuring checksum verificationSelecting the interfaces to monitor 270 271 Viewing the signature listViewing attack descriptions 272 Disabling Nids attack signaturesAdding user-defined signatures Downloading the user-defined signature list 273 Enabling Nids attack prevention To enable Nids attack prevention Go to Nids PreventionPreventing attacks Enabling Nids attack prevention signatures Setting signature threshold values 275 Reducing the number of Nids attack log and email messages Logging attacksLogging attack messages to the attack log Automatic message reduction Manual message reduction 277 278 279 General configuration stepsAntivirus protection To scan FortiGate firewall traffic for viruses Antivirus scanning280 File blocking 281 282 Blocking files in firewall trafficAdding file patterns to block To block files in firewall traffic Quarantining blocked files QuarantineQuarantining infected files 283 284 Viewing the quarantine listSorting the quarantine list To view the quarantine list Go to Anti-Virus Quarantine Deleting files from the quarantine list Configuring quarantine optionsFiltering the quarantine list Downloading quarantined files 286 Configuring limits for oversized files and emailBlocking oversized files and emails Viewing the virus list To view the virus list Go to Anti-Virus Config Virus ListExempting fragmented email from blocking 287 288 Web filtering 289 Adding words and phrases to the Banned Word list Content blockingGo to Web Filter Content Block 290 Clearing the Banned Word list 291 292 Backing up the Banned Word listRestoring the Banned Word list Adding URLs to the Web URL block list Configuring FortiGate Web URL blockingURL blocking 293 Clearing the Web URL block list 294 295 Downloading the Web URL block listUploading a URL block list To upload a URL block list 296 Configuring Cerberian URL filteringConfiguring FortiGate Web pattern blocking About the default group and policy Installing a Cerberian license keyConfiguring Cerberian web filter Adding a Cerberian user 298 To configure Cerberian web filteringEnabling Cerberian URL filtering Selecting script filter options Script filteringEnabling script filtering 299 300 Exempt URL listAdding URLs to the URL Exempt list Go to Web Filter URLExempt 301 Downloading the URL Exempt ListUploading a URL Exempt List Go to Web Filter URL Exempt 302 Email filter 303 304 Email banned word listAdding words and phrases to the email banned word list 305 Downloading the email banned word listUploading the email banned word list Downloading the email block list Email block listAdding address patterns to the email block list 306 307 Email exempt listUploading an email block list To upload the email block list Adding address patterns to the email exempt list To add a subject tag Go to Email Filter ConfigAdding a subject tag 308 309 Logging and reportingRecording logs 310 Recording logs on a remote computerRecording logs on a NetIQ WebTrends server Overwrite Recording logs on the FortiGate hard disk311 Option 312 Recording logs in system memoryLog message levels 313 To filter log entries Go to Log&Report Log SettingFiltering log messages Configuring traffic logging 314 Enabling traffic logging for a Vlan subinterface Enabling traffic loggingEnabling traffic logging for an interface Enabling traffic logging for a firewall policy 316 Configuring traffic filter settingsAdding traffic filter entries Resolve IP Viewing logs Destination IP Address Destination Netmask ServiceViewing logs saved to memory 317 318 Viewing and managing logs saved to the hard diskSearching logs Keyword 319 To view the active or saved logs Go to Log&Report Logging Deleting a saved log file Downloading a log file to the management computerDeleting all messages from an active log 320 Adding alert email addresses Configuring alert emailTesting alert email 321 Enabling alert email 322 Glossary 323 324 325 326 Index 327 328 Index 329 Dialup Pptp 330 Http 331 Ldap 332 333 Pptp dialup connection 334 335 TCP 336 Vlan