Antivirus scanning, 226 | Fortinet 50A instruction

Antivirus scanning	Antivirus protection

Antivirus scanning

Virus scanning intercepts most files (including files compressed with up to 12 layers of compression using zip, rar, gzip, tar, upx, and OLE) in the content streams for which you enable antivirus protection. Each file is tested to determine the file type and the most effective method of scanning the file for viruses. For example, binary files are scanned using binary virus scanning and Microsoft Office files containing macros are scanned for macro viruses.

FortiGate virus scanning does not scan the following file types:

•cdimage

•floppy image

•.ace

•.bzip2

•.Tar+Gzip+Bzip2

If a file is found to contain a virus, the FortiGate unit removes the file from the content stream and replaces it with a replacement message.

To scan FortiGate firewall traffic for viruses

1Select antivirus scanning in a content profile.

For information about content profiles, see “Adding content profiles” on page 167.

2Add this content profile to firewall policies to apply virus scanning to the traffic controlled by the firewall policy.

See “Adding content profiles to policies” on page 169.

Figure 34: Example content profile for virus scanning

226	Fortinet Inc.

Image 226

Fortinet 50A user manual Antivirus scanning, 226, To scan FortiGate firewall traffic for viruses

Contents

Installation and Configuration Guide February Trademarks Regulatory Compliance Table of Contents Transparent mode installation Virus and attack definitions updates and registration Network configuration Firewall configuration 137 Users and authentication 171 Pptp and L2TP VPN 203 Antivirus protection 225 Glossary 259 Index 263 Contents Transparent mode NAT/Route mode and Transparent modeNAT/Route mode Introduction Document conventions Fortinet documentation Comments on Fortinet technical documentation Customer service and technical support Getting started Package contents Mounting Environmental specifications Powering onConnecting to the web-based manager To power on the FortiGate-50A unit Connecting to the command line interface CLI To connect to the web-based manager Bits per second Data bits Parity To connect to the CLIStop bits Flow control Factory default FortiGate configuration settings Factory default Dhcp configuration Factory default Transparent mode network configuration Factory default NAT/Route mode network configurationFactory default firewall configuration Authentication Factory default firewall configuration RecurringService Content Strict content profile Factory default content profilesStrict content profile Options Scan content profile Options Scan content profileWeb content profile Web content profile Options Unfiltered content profile Planning the FortiGate configurationUnfiltered content profile Options Configuration options Setup wizard CLI FortiGate model maximum values matrix Next steps Signatures Antivirus file Block patterns Web filter Next steps Getting started NAT/Route mode installation Changing the default configuration Preparing to configure NAT/Route modeInternal servers Starting the setup wizard Using the setup wizardAdvanced NAT/Route mode settings Reconnecting to the web-based manager Configuring NAT/Route mode IP addresses Using the command line interfaceConfiguring the FortiGate unit to operate in NAT/Route mode Example FortiGate-50A External Connecting the FortiGate unit to your networksInternal Setting the date and time Configuring your networksCompleting the configuration Changing antivirus protection Configuring virus and attack definition updates Registering your FortiGate unit Completing the configuration Transparent mode settings Administrator Password Transparent mode installationPreparing to configure Transparent mode DNS Settings Changing to Transparent mode Go to System Status Configuring the Transparent mode management IP address Configure the Transparent mode default gateway Connecting the FortiGate unit to your networks Registering your FortiGate Enabling antivirus protectionGo to Firewall Policy Int-Ext Transparent mode configuration examples Default routes and static routes General configuration steps Default route to an external network Go to System Network Management Web-based manager example configuration stepsCLI configuration steps Go to System Network Routing DMZ 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 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 Testing a new firmware image before installing it Restoring the previous configurationTo test a new firmware image Save as Default firmware/Run image without savingD/R To update the antivirus definitions manually Manual virus definition updatesManual attack definition updates To update the attack definitions manually Displaying the FortiGate serial number Backing up system settingsRestoring system settings Displaying the FortiGate up time Changing to Transparent mode Restoring system settings to factory defaultsTo change to Transparent mode Go to System Status Restarting the FortiGate unit Changing to NAT/Route modeTo change to NAT/Route mode Go to System Status Shutting down the FortiGate unit Viewing CPU and memory status System statusTo 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 Sessions and network status monitor Session list To view the session list Go to System Status Session Protocol Example session list Session list Virus and attack definitions updates and registration Updating 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 Enabling scheduled updates Scheduling updatesConfiguring update logging To configure update logging Go to Log&Report Log Setting To add an override server Go to System Update Adding an override server Enabling push updates Enabling scheduled updates through a proxy server Enabling push updates through a NAT device Enabling push updatesPush updates when FortiGate IP addresses change To enable push updates Go to System Update Example push updates through a NAT device Example network topology Push updates through a NAT device General procedure Schedule Always Service ANY Action Accept To configure the FortiGate NAT deviceAdding a firewall policy for the port forwarding virtual IP Example push update configuration Registering FortiGate units FortiCare Service Contracts Registering the FortiGate unit Recovering a lost Fortinet support password Updating registration information Viewing the list of registered FortiGate units Registering a new FortiGate unit Adding or changing a FortiCare Support Contract number Changing your Fortinet support password Changing your contact information or security question Downloading virus and attack definitions updates Downloading virus and attack definition updates Registering a FortiGate unit after an RMA Registering a FortiGate unit after an RMA Network configuration Configuring interfaces To stop an interface that is administratively up Changing the administrative status of an interfaceConfiguring an interface with a manual IP address Viewing the interface list Initializing Configuring an interface for DhcpConnecting Connected Configuring an interface for PPPoE Adding a secondary IP address to an interface Controlling administrative access to an interface Adding a ping server to an interface Configuring traffic logging for connections to an interface Changing the MTU size to improve network performance Configuring the management interface in Transparent mode Adding DNS server IP addresses Configuring routingAdding a default route 100 Adding destination-based routes to the routing table 101 Configuring the routing table Adding routes in Transparent mode102 Policy routing 103 Configuring a Dhcp relay agent Configuring Dhcp servicesPolicy routing command syntax 104 Adding scopes to a Dhcp server Configuring a Dhcp serverAdding a Dhcp server to an interface 105 Scope Name Adding a reserve IP to a Dhcp server106 IP Pool Viewing a Dhcp server dynamic IP list Configuring the modem interface107 To configure modem settings Go to System Network Modem Connecting a modem to the FortiGate unitConfiguring modem settings 108 109 Connecting to a dialup accountDisconnecting the modem To connect to a dialup account Go to System Network Modem To configure backup mode Go to System Network Modem Backup mode configurationStandalone mode configuration Viewing modem status Adding firewall policies for modem connections To operate in standalone mode Go to System Network Modem111 112 RIP settings RIP configuration113 Holddown InvalidFlush Configuring RIP for FortiGate interfaces 115 116 117 Adding RIP filtersAdding a RIP filter list To add a RIP filter list Go to System RIP Filter Assigning a RIP filter list to the neighbors filter Assigning a RIP filter list to the incoming filter Assigning a RIP filter list to the outgoing filter 119 120 To set the date and time Go to System Config Time System configurationSetting system date and time 121 Changing system options To set the system idle timeout Go to System Config OptionsTo set the Auth timeout Go to System Config Options 122 Modifying the Dead Gateway Detection settings Adding and editing administrator accounts123 To add an administrator account Go to System Config Admin Adding new administrator accountsEditing administrator accounts 124 To edit an administrator account Go to System Config Admin Configuring Snmp125 Configuring Snmp access to an interface Configuring the FortiGate unit for Snmp monitoringConfiguring FortiGate Snmp support Configuring Snmp community settings System Name 127System Location FortiGate MIBs 128 System traps FortiGate trapsGeneral FortiGate traps 129 130 Users and authentication configuration System configuration and statusFirewall configuration 131 132 Customizing replacement messages Replacement messages133 Customizing alert emails 134 135 Nids event 136 Critical event Firewall configuration 137 Addresses Default firewall configuration138 Schedules ServicesContent profiles 139 Adding firewall policies 140 Action 141 142 VPN TunnelTraffic Shaping Dynamic IP Pool Fixed Port 143 AuthenticationAnti-Virus & Web filter Maximum Bandwidth Traffic Priority Comments Configuring policy listsLog Traffic 144 Changing the order of policies in a policy list Policy matching in detail145 Disabling policies AddressesEnabling and disabling policies Enabling policies 147 Adding addressesTo add an address Go to Firewall Address Organizing addresses into address groups Editing addressesDeleting addresses 148 Predefined services Services149 150 GRE 151 Ldap Adding custom TCP and UDP services 152 Grouping services Adding custom Icmp servicesAdding custom IP services 153 Schedules 154 Creating recurring schedules Creating one-time schedules155 Adding schedules to policies 156 157 Virtual IPsTo 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 IPs158 Virtual IP External Interface examples Description Internal Adding port forwarding virtual IPs 159 160 Adding a port forwarding virtual IP 161 IP poolsAdding policies with virtual IPs To add a policy with a virtual IP Go to Firewall Policy IP pools and dynamic NAT Adding an IP poolIP Pools for firewall policies that use fixed ports 162 163 IP/MAC bindingGo to Firewall IP/MAC Binding Static IP/MAC Configuring IP/MAC binding for packets going to the firewall 164 Enabling IP/MAC binding Adding IP/MAC addressesViewing the dynamic IP/MAC list 165 Content profiles 166 To add a content profile Go to Firewall Content Profile Default content profilesAdding content profiles 167 168 Oversized File/Email Pass Fragmented Email To add a content profile to a policy Go to Firewall Policy Adding content profiles to policies169 170 Users and authentication 171 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 173 Deleting Radius servers Configuring Radius supportAdding Radius servers 174 175 Configuring Ldap supportAdding Ldap servers To add an Ldap server Go to User Ldap 176 Deleting Ldap serversTo delete an Ldap server Go to User Ldap 177 Configuring user groupsAdding user groups To add a user group Go to User User Group 178 Deleting user groupsTo delete a user group Go to User User Group IPSec VPN 179 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 181 AES128 AutoIKE IPSec VPNs182 AES192 To create an AutoIKE VPN configuration General configuration steps for an AutoIKE VPNAdding a phase 1 configuration for an AutoIKE VPN To add a phase 1 configuration Go to VPN Ipsec Phase Remote Gateway Static IP Address 184Remote Gateway Dialup User To configure phase 1 advanced options Configuring advanced options185 186 Adding a phase 1 configuration Standard options 187 To add a phase 2 configuration Go to VPN Ipsec Phase Adding a phase 2 configuration for an AutoIKE VPN188 Use selectors from policy 189Use wildcard selectors Generating the certificate request Managing digital certificatesObtaining a signed local certificate 190 Key Type 191Key Size Obtaining CA certificates Downloading the certificate requestImporting the signed local certificate 192 Importing CA certificates Configuring encrypt policies193 194 Adding a source addressAdding a destination address To add a source address Go to Firewall Address 195 Adding an encrypt policyTo add an encrypt policy Go to Firewall Policy IPSec VPN concentrators 196 To create a VPN concentrator configuration VPN concentrator hub general configuration steps197 198 Adding a VPN concentratorSource InternalAll Destination VPN spoke address Action To create a VPN spoke configuration VPN spoke general configuration steps199 VPN Tunnel 200Policies 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 202 Pptp and L2TP VPN Configuring PptpConfiguring the FortiGate unit as a Pptp gateway 203 204 To add a source address To add a destination address 205To add a source address group To add a firewall policy 206 Configuring a Windows 98 client for PptpTo connect to the Pptp VPN Configuring a Windows XP client for Pptp Configuring a Windows 2000 client for Pptp207 208 To configure the VPN connectionSelect Properties Security Configuring the FortiGate unit as an L2TP gateway Configuring L2TP209 210 To add source addresses Configuring a Windows 2000 client for L2TP 211 212 To disable IPSecTo connect to the L2TP VPN Configuring a Windows XP client for L2TP 213 214 Detecting attacks Network Intrusion Detection System Nids215 Disabling monitoring interfaces Configuring checksum verificationSelecting the interfaces to monitor 216 Viewing attack descriptions Viewing the signature list217 Adding user-defined signatures Disabling Nids attack signatures218 Downloading the user-defined signature list 219 Enabling Nids attack prevention To enable Nids attack prevention Go to Nids PreventionPreventing attacks Enabling Nids attack prevention signatures Setting signature threshold values 221 Reducing the number of Nids attack log and email messages Logging attacksLogging attack messages to the attack log Automatic message reduction Manual message reduction 223 224 Antivirus protection General configuration steps225 226 Antivirus scanningTo scan FortiGate firewall traffic for viruses Adding file patterns to block File blockingBlocking files in firewall traffic 227 Exempting fragmented email from blocking Configuring limits for oversized files and emailBlocking oversized files and emails 228 Viewing the virus list To view the virus list Go to Anti-Virus Config Virus List229 230 Web filtering 231 Adding words and phrases to the Banned Word list Content blockingGo to Web Filter Content Block 232 Restoring the Banned Word list Clearing the Banned Word listBacking up the Banned Word list 233 234 Example Banned Word List text file Adding URLs to the Web URL block list Configuring FortiGate Web URL blockingURL blocking 235 Uploading a URL block list Clearing the Web URL block listDownloading the Web URL block list 236 237 Configuring FortiGate Web pattern blockingTo upload a URL block list Adding a Cerberian user Configuring Cerberian URL filteringInstalling a Cerberian license key 238 To configure Cerberian web filtering Configuring Cerberian web filterAbout the default group and policy Enabling Cerberian URL filtering Selecting script filter options Script filteringEnabling script filtering 240 241 Exempt URL listAdding URLs to the URL Exempt list Go to Web Filter URL Exempt Uploading a URL Exempt List Downloading the URL Exempt List242 243 244 Email filter 245 Adding words and phrases to the email banned word list Email banned word list246 Uploading the email banned word list Downloading the email banned word list247 Downloading the email block list Email block listAdding address patterns to the email block list 248 249 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 250 Recording logs on a remote computer Logging and reportingRecording logs 251 Recording logs on a NetIQ WebTrends server 252 Log message levels To filter log entries Go to Log&Report Log SettingFiltering log messages 253 Configuring traffic logging 254 Enabling traffic logging for an interface Configuring traffic filter settingsEnabling traffic logging Enabling traffic logging for a firewall policy Adding traffic filter entries Destination IP Address Destination Netmask Service256 257 Configuring alert emailAdding alert email addresses To add a DNS server Go to System Network DNS Enabling alert email Testing alert email258 Glossary 259 260 261 262 Index 263 264 Index 265 DNS 266 Http 267 NAT 268 269 RMA 270 TCP 271 VPN 272