Fortinet manual IPS sensor attributes, IPS sensor filters

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IPS sensors

Configuring IPS sensors

To view an IPS sensor, go to Intrusion Protection > IPS Sensor and select the Edit icon of any IPS sensor. The Edit IPS Sensor window is divided into three parts: the sensor attributes, the filters, and the overrides.

Figure 9: Edit IPS sensor

IPS sensor attributes:

Name

The name of the IPS sensor. You can change it at any time.

Comments

An optional comment describing the IPS sensor. You can change it at

 

any time.

 

OK

Select to save changes to Name or Comments.

IPS sensor filters:

 

Add Filter

Add a new filter to the end of the filter list. For more information, see

 

“Configuring filters” on page 42.

#

Current position of each filter in the list.

Name

The name of the filter.

Signature

Signature attributes specify the type of network traffic the signature

attributes

applies to.

 

 

Severity

The severity of the included signatures.

 

Target

The type of system targeted by the attack. The targets

 

 

are client and server.

 

Protocol

The protocols to which the signatures apply. Examples

 

 

include HTTP, POP3, H323, and DNS.

 

OS

The operating systems to which the signatures apply.

 

Application The applications to which the signatures apply.

Enable

The status of the signatures included in the filter. The signatures can be

 

set to enabled, disabled, or default. The default setting uses the default

 

status of each individual signature as displayed in the signature list.

Logging

The logging status of the signatures included in the filter. Logging can

 

be set to enabled, disabled, or default. The default setting uses the

 

default status of each individual signature as displayed in the signature

 

list.

 

Action

The action of the signatures included in the filter. The action can be set

 

to pass all, block all, reset all, or default. The default setting uses the

 

action of each individual signature as displayed in the signature list.

Count

The number of signatures included in the filter. Overrides are not

 

included in this total.

Delete icon

Delete the filter.

Edit icon

Edit the filter.

 

Insert icon

Create a new filter and insert it above the current filter.

FortiGate IPS User Guide Version 3.0 MR7

 

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Contents E R G U I D E Trademarks Contents IPS sensors Protocol decodersDoS sensors SYN flood attacksFortiGate IPS IntroductionFortinet documentation About this documentDocument conventions Typographic conventionsFortiGate Pptp VPN User Guide Comments on Fortinet technical documentation Customer service and technical supportFortinet Knowledge Center This section contains the following topics IPS overview and general configurationIPS settings and controls Default signature and anomaly settings When to use IPSDefault fail open setting Config ips global Set fail-open enable disable endConfiguring logging and alert email Setting the buffer sizeMonitoring the network and dealing with attacks Controlling sessionsAttack log messages Signature FortiGuard Center AnomalyCreating a protection profile that uses IPS sensors Using IPS sensors in a protection profileAdding protection profiles to firewall policies Select Create NewAdding protection profiles to user groups Using IPS sensors in a protection profile Viewing the predefined signature list Predefined signaturesIPS predefined signatures Enable SettingsColumn Clear All FiltersCreate a sensor and add IPS filters to it Viewing the predefined signature list Viewing the custom signature list Custom signaturesIPS custom signatures Adding custom signatures using the web-based manager Custom signature configurationAdding custom signatures using the CLI Command syntax patternShows the valid characters for custom signature fields Creating custom signaturesCustom signature fields Attackid Custom signature syntaxName BufferOverflow SrcportContent keywords Keyword and value Description Deprecated, see pattern and context keywords Context uri Pattern GETPattern yahoo.com Context hostRegex/mdelim PcreRegexdelimismxAEGRU Uri !uristrIP header keywords Keyword and Value Description Protocol tcpTCP header keywords Keyword and Value Description Tcpflags S,12 Tcpflags APOther keywords Keyword and Value Description UDP header keywords Keyword and Value DescriptionIcmp keywords Keyword and Value Usage Sbid --name Block.example.com Example 1 signature to block access to example.comExample custom signatures Sbid --name Block.example.com Sbid --name Block.SMTP.VRFY.CMD --pattern vrfy Example 2 signature to block the Smtp ‘vrfy’ commandSbid --name Block.SMTP.VRFY.CMD Creating custom signatures Upgrading the IPS protocol decoder list Protocol decodersProtocol decoders Protocol decoder list Protocols Protocol decoder names Port Viewing the protocol decoder listAlldefaultpass AlldefaultIPS sensors Viewing the IPS sensor listAdding an IPS sensor Configuring IPS sensorsProtectclient ProtectemailserverIPS sensor filters IPS sensor attributesReset Configuring filtersIPS sensor overrides Delete and Edit Delete or edit the filter IconsApplication Configuring pre-defined and custom overridesSource Exempt IPDoS sensors Viewing the DoS sensor list Configuring DoS sensorsSequence in which the sensors examine network traffic Appears, and select OKDoS sensor attributes Anomaly configurationName Enter or change the DoS sensor name Comments Will appear in the DoS sensor listUnderstanding the anomalies Udpflood Anomaly Description TcpdstsessionUdpscan UdpsrcsessionUnderstanding the anomalies How SYN floods work What is a SYN flood attack?SYN flood attacks What is SYN proxy? What is SYN threshold?FortiGate IPS Response to SYN flood attacks How IPS works to prevent SYN floodsIPS operation before synflood threshold is reached Configure the options for tcpsynflood Select OK Configuring SYN flood protectionSuggested settings for different network conditions Icmp sweep attacks What is an Icmp sweep?How Icmp sweep attacks work FortiGate IPS response to Icmp sweep attacksPredefined Icmp signatures Icmp sweep anomalies Configuring Icmp sweep protection FortiGate Version 3.0 MR7 IPS User Guide IndexTechnical support