Fortinet 100 user manual Selecting the interfaces to monitor, Disabling the Nids, 222

Page 222

Selecting the interfaces to monitor	Network Intrusion Detection System (NIDS)

Selecting the interfaces to monitor

1Go to NIDS > Detection > General.

2Select the interfaces to monitor for network attacks. You can select one or more interfaces.

3Select Apply.

Disabling the NIDS

1Go to NIDS > Detection > General.

2Deselect all monitored interfaces.

3Select Apply.

Configuring checksum verification

Checksum verification tests files passing through the FortiGate unit to make sure that they have not been changed in transit. The NIDS can run checksum verification on IP, TCP, UDP, and ICMP traffic. For maximum detection, you can turn on checksum verification for all types of traffic. However, if the FortiGate unit does not need to run checksum verification, you can turn it off for some or all types of traffic to improve system performance. For example, you might not need to run checksum verification if your FortiGate unit is installed behind a router that also does checksum verification.

1Go to NIDS > Detection > General.

2Check the type of traffic on which to run Checksum Verifications.

3Select Apply.

Figure 33: Example NIDS detection configuration

222	Fortinet Inc.

Image 222

Contents Installation and Configuration Guide AugustTrademarks Regulatory ComplianceTable 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 Introduction Antivirus protectionWeb content filtering Email filteringNAT/Route mode FirewallTransparent mode Network intrusion detectionSecure installation, configuration, and management Web-based managerCommand line interface FortiGate web-based manager and setup wizardWhat’s new in Version System administrationNetwork configuration Logging and reportingDhcp server Replacement messagesUsers and authentication FirewallAntivirus Web FilterEmail filter About this document Document conventions Fortinet documentation Comments on Fortinet technical documentationCustomer service and technical support Comments on Fortinet technical documentation Getting started Package contents MountingPowering on Environmental specificationsConnecting to the web-based manager Connecting to the web-based managerBits per second 9600 Data bits Parity Connecting to the command line interface CLIFactory default FortiGate configuration settings Stop bits Flow controlInternal interface Factory default NAT/Route mode network configurationAccount External interfaceFactory default Transparent mode network configuration Factory default firewall configurationAuthentication Factory default content profilesFactory default firewall configuration Traffic Shaping Antivirus & Web FilterStrict content profile Options Strict content profileScan content profile Scan content profile OptionsWeb content profile Options Web content profileUnfiltered content profile Unfiltered content profile OptionsPlanning your FortiGate configuration Example NAT/Route mode network configurationNAT/Route mode with multiple external network connections Example NAT/Route multiple internet connection configurationConfiguration options Setup WizardFortiGate model maximum values matrix Next steps Configuration options Getting started NAT/Route mode installation Preparing to configure NAT/Route modeInternal servers DMZ interface Advanced NAT/Route mode settingsAdvanced FortiGate NAT/Route mode settings Dhcp serverUsing the setup wizard Using the command line interfaceSet system interface external mode static ip 204.23.1.5 Connecting the FortiGate unit to your networks FortiGate-100 NAT/Route mode connectionsConfiguring the DMZ interface Configuring your networksCompleting the configuration Setting the date and timeEnabling antivirus protection Configuration example Multiple connections to the InternetConfiguring virus and attack definition updates Registering your FortiGateExample multiple Internet connection configuration Using the CLI Configuring Ping serversPrimary and backup links to the Internet Destination based routing examplesLoad sharing Load sharing and primary and secondary connectionsAdding the routes using the CLI Routing table should have routes arranged as shown in TableRouting a service to an external network Policy routing examplesAdding more firewall policies Adding a redundant default policyFirewall policy example Action AcceptRestricting access to a single Internet connection Transparent mode settings Administrator Password Transparent mode installationPreparing to configure Transparent mode DNS SettingsChanging to Transparent mode Go to System StatusConfiguring the Transparent mode management IP address Configure the Transparent mode default gatewayFortiGate-100 Transparent mode connections Setting the date and time Transparent mode configuration examples Default routes and static routesGeneral configuration steps Default route to an external networkGo to System Network Management Web-based manager example configuration stepsCLI configuration steps Go to System Network RoutingStatic 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 statusFirmware 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 Execute restore image namestr tftpip Revert to a previous firmware versionReverting to a previous firmware version using the CLI Execute ping Install a firmware image from a system reboot using the CLI To install firmware from a system rebootPress Any Key To Download Boot Image Test a new firmware image before installing it Restoring your previous configurationTest a new firmware image before installing it Installing and using a backup firmware image Installing a backup firmware imageInstalling and using a backup firmware image Switching to the backup firmware image Manual virus definition updates Switching back to the default firmware imageDisplaying the FortiGate serial number Manual attack definition updatesBacking up system settings Displaying the FortiGate up timeRestoring system settings Restoring system settings to factory defaultsChanging to Transparent mode Changing to NAT/Route modeRestarting the FortiGate unit Shutting down the FortiGate unit System statusViewing CPU and memory status Viewing sessions and network status Go to System Status MonitorViewing virus and intrusions status Sessions and network status monitorSession list Viewing the session list Go to System Status SessionTo IP Virus and attack definitions updates and registration Updating antivirus and attack definitionsConnecting to the FortiResponse Distribution Network Version Expiry date Last update attempt Last update statusConfiguring scheduled updates Go to System UpdateConfiguring 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 and external dynamic IP addresses To enable push updatesAbout push updates Push updates through a NAT deviceExample push updates through a NAT device Example network topology Push updates through a NAT deviceGeneral procedure Go to Firewall Virtual IPSchedule Always Service ANY Action Accept Adding a firewall policy for the port forwarding virtual IPScheduled updates through a proxy server 100FortiCare Service Contracts Registering FortiGate units101 Registering the FortiGate unit 102103 Registering a FortiGate unit product informationViewing the list of registered FortiGate units Recovering a lost Fortinet support passwordUpdating registration information 104Registering a new FortiGate unit Adding or changing a FortiCare Support Contract number105 Changing your contact information or security question Changing your Fortinet support passwordDownloading virus and attack definitions updates 106Registering a FortiGate unit after an RMA 107108 Network configuration Configuring interfaces109 Changing an interface static IP address Viewing the interface listBringing up an interface Adding a secondary IP address to an interfaceControlling 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 Configuring the external interface for PPPoE 113Configuring the management interface Transparent mode 115 Configuring routingAdding DNS server IP addresses Go to System Network DNSAdding a default route Adding destination-based routes to the routing tableAdding routes in Transparent mode 117Configuring the routing table Policy routing119 Providing Dhcp services to your internal networkPolicy routing command syntax Go to System Network DhcpViewing the dynamic IP list 120RIP configuration 121RIP settings Go to System RIP Settings122 Invalid Update123 Holddown124 Configuring RIP for FortiGate interfacesPassword ModeAdding RIP neighbors 125Adding RIP neighbors Go to System RIP Neighbor 126 Adding RIP filtersAdding a single RIP filter Go to System RIP FilterAdd the IP address of the route Adding a RIP filter list127 Mask Add the netmask of the route ActionAdding a neighbors filter Adding a routes filter128 To set the date and time Go to System Config Time System configurationSetting system date and time 129To set the system idle timeout Changing web-based manager options130 131 To set the Auth timeoutTo modify the Dead Gateway Detection settings To select a language for the web-based managerGo to System Config Admin Adding and editing administrator accountsAdding new administrator accounts 132Editing administrator accounts To edit an administrator account Go to System Config Admin133 Configuring FortiGate Snmp support Configuring SnmpConfiguring the FortiGate unit for Snmp monitoring Go to System Config Snmp v1/v2cTrap Community Trap Receiver IP Addresses FortiGate MIBs135 FortiGate MIBs MIB file name Description EtherLike.mib136 Customizing replacement messagesFortiGate traps FortiGate traps Trap message DescriptionCustomizing replacement messages Go to System Config Replacement Messages137 Customizing alert emails 138Alert email message sections 139 Alert email message sections140 Firewall configuration 141Default firewall configuration Addresses142 Schedules ServicesContent profiles 143Adding firewall policies 144Go to Firewall Policy 145 146 VPN TunnelTraffic Shaping Dynamic IP Pool Fixed PortAuthentication Anti-Virus & Web filter147 Log Traffic Comments148 Changing the order of policies in a policy list Configuring policy listsPolicy matching in detail 149Disabling a policy AddressesEnabling and disabling policies Enabling a policyAdding addresses 151Go to Firewall Address Organizing addresses into address groups Editing addressesDeleting addresses 152Services Predefined services153 154 ANY155 IRCGo to Firewall Service Custom Providing access to custom servicesGrouping services Go to Firewall Service GroupSchedules 157158 Creating one-time schedulesCreating recurring schedules Go to Firewall Schedule One-timeAdding a schedule to a policy 159Virtual IPs Adding static NAT virtual IPs160 Adding port forwarding virtual IPs 161162 Adding policies with virtual IPs 163164 IP poolsAdding an IP pool Go to Firewall IP PoolIP Pools for firewall policies that use fixed ports IP pools and dynamic NAT165 166 Go to Firewall IP/MAC Binding SettingIP/MAC binding Go to Firewall IP/MAC Binding Static IP/MACAdding IP/MAC addresses 167168 Viewing the dynamic IP/MAC listEnabling IP/MAC binding Go to Firewall IP/MAC Binding Dynamic IP/MACContent profiles 169Go to Firewall Content Profile Default content profilesAdding a content profile 170Adding a content profile to a policy 171Oversized File/Email Block Pass Fragmented Email 172 Users and authentication 173Adding user names and configuring authentication Setting authentication timeoutAdding user names and configuring authentication 174Deleting user names from the internal database 175Deleting Radius servers Configuring Radius supportAdding Radius servers 176177 Configuring Ldap supportAdding Ldap servers Go to User LdapDeleting Ldap servers 178179 Configuring user groupsAdding user groups Go to User User GroupDeleting user groups 180IPSec VPN 181AutoIKE with pre-shared keys Key managementManual Keys AutoIKE with certificatesAdding a manual key VPN tunnel General configuration steps for a manual key VPNManual key IPSec VPNs 183184 Go to VPN Ipsec Phase General configuration steps for an AutoIKE VPNAdding a phase 1 configuration for an AutoIKE VPN AutoIKE IPSec VPNs186 Remote Gateway Static IP AddressRemote Gateway Dialup User Configuring advanced options 187188 Adding a phase 2 configuration for an AutoIKE VPN 189190 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 Importing a CA certificate Obtaining a CA certificateRetrieving a CA certificate 195Configuring encrypt policies 196Adding an encrypt policy Adding a source addressAdding a destination address 197198 Adding an encrypt policyVPN concentrator hub general configuration steps IPSec VPN concentrators199 200 Source InternalAll Destination VPN spoke address ActionAdding a VPN concentrator 201Go to VPN IPSec Concentrator VPN Tunnel VPN spoke general configuration steps202 PoliciesConfiguring redundant IPSec VPN Redundant IPSec VPNs203 See Adding a phase 1 configuration for an AutoIKE VPN on 204Viewing dialup VPN connection status Monitoring and Troubleshooting VPNsViewing VPN tunnel status 205Testing a VPN 206Go to VPN IPSec Dialup Configuring Pptp Pptp and L2TP VPN207 Enabling Pptp and specifying an address range Configuring the FortiGate unit as a Pptp gatewayAdding users and user groups 208Adding an address group 209Go to Start Settings Control Panel Network Configuring a Windows 98 client for PptpInstalling Pptp support Adding a firewall policyConfiguring a Windows 2000 client for Pptp Configuring a Pptp dialup connectionConnecting to the Pptp VPN 211212 Configuring a Windows XP client for PptpConfiguring the VPN connection Go to Start Control PanelConfiguring L2TP 213214 Configuring the FortiGate unit as a L2TP gatewayEnabling L2TP and specifying an address range Go to VPN L2TP L2TP RangeSample L2TP address range configuration 215216 Disabling IPSec Configuring a Windows 2000 client for L2TPConfiguring an L2TP dialup connection 217Configuring an L2TP VPN dialup connection Connecting to the L2TP VPNConfiguring a Windows XP client for L2TP Go to Start Settings219 220 Network Intrusion Detection System Nids Detecting attacks221 Disabling the Nids Configuring checksum verificationSelecting the interfaces to monitor 222223 Viewing the signature listViewing attack descriptions Go to Nids Detection Signature List224 Enabling and disabling Nids attack signaturesAdding user-defined signatures Go to Nids Detection User Defined Signature ListEnabling Nids attack prevention Preventing attacksDownloading the user-defined signature list 225Setting signature threshold values Enabling Nids attack prevention signatures226 227 Logging attacks Configuring synflood signature valuesValue Description Minimum Maximum Default Logging attack messages to the attack logManual message reduction Reducing the number of Nids attack log and email messagesAutomatic message reduction 229230 General configuration steps Antivirus protection231 Antivirus scanning 232To scan FortiGate firewall traffic for viruses Adding file patterns to block File blockingBlocking files in firewall traffic 233Exempting fragmented email from blocking Configuring limits for oversized files and emailBlocking oversized files and emails Viewing the virus listWeb filtering 235Adding words and phrases to the banned word list Content blockingGo to Web Filter Content Block 236Adding URLs or URL patterns to the block list Using the FortiGate web filterURL blocking 237Clearing the URL block list 238Downloading the URL block list Uploading a URL block list239 Adding a Cerberian user to the FortiGate unit Using the Cerberian web filterInstalling a Cerberian license key on the FortiGate unit 240To configure the Cerberian web filtering Configuring Cerberian web filterAbout the default group and policy Enabling Cerberian URL filteringSelecting script filter options Script filteringEnabling the script filter 242243 Exempt URL listAdding URLs to the exempt URL list Go to Web Filter Exempt URL244 Email filter 245Go to Email Filter Content Block Email banned word list246 Adding address patterns to the email block list Email block listEmail exempt list 247Adding address patterns to the email exempt list To add a subject tag Go to Email Filter ConfigAdding a subject tag 248Logging 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 Example log filter configuration 252Enabling traffic logging for an interface Configuring traffic loggingEnabling traffic logging Enabling traffic logging for a firewall policyAdding traffic filter entries Configuring traffic filter settingsGo to Log&Report Log Setting Traffic Filter 254Viewing logs Destination IP Address Destination Netmask ServiceViewing logs saved to memory 255Adding alert email addresses Configuring alert emailSearching logs 256257 Testing alert emailEnabling alert email Go to Log&Report Alert Mail Categories258 Glossary 259260 261 262 Index 263264 Index265 FDS266 Ldap267 MIB268 RMA269 TCP270 UDP271 272

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