config security dos http-request-flood-protection

HTTP Request Flood policy can limit the speed of HTTP requests from a client that is marked by a cookie.

Syntax

configure security dos http-request-flood-protection

edit <name>

set status [enable | disable]

set request-limit-per-session <integer>

set action [ Pass | deny | Pass&deny | block-period | captcha]

set block-period <integer>

set severity [ high | medium | low | info]

next

end

CLI specification

CLI Parameter	Help message	Type	Scope	Default	Must
request-limit-per-session	The request limitation of per HTTP session	integer	0-65535	0	No
action	Action when limit is reached	choice	Pass deny block-period captcha	deny	No
block-period	Number of seconds during which to block the connection action	integer	1-3600	60	No
severity	Severity of the Log	choice	info low medium high	high	No
log	Record log message	choice	enable disable	disable	No

Function description

CLI Parameter	Description
request-limit-per-session	If FortiADC receives a HTTP request, it will first match the URL and host. If these match, it will insert a cookie to the header when the response arrives. If a new request arrives and carries a cookie which is inserted by FortiADC, FortiADC will find a block to record the number of all the TCP connections which use the same cookie; if it reaches the limit, FortiADC will take action.
action	DoS protect action
block-period	Block the HTTP request for a period (second). During this period if the TCP connection’s request has the blocked cookie, it will be aborted. If FortiADC reboots, this block action is still valid.
severity	Log severity level
log	Enable or disable log

Example

configure security dos http-request-flood-protection

edit req-limit

set request-limit-per-session 2

set action block-period

set block-period 20

set log enable

set severity medium

next

end

configure security dos http-request-flood-protection

edit req-limit

set request-limit-per-session 2

set action Pass

next

end

configure security dos http-request-flood-protection

edit req-limit

set request-limit-per-session 2

next

end