config firewall : config firewall connlimit
config firewall connlimit
Use this command to create connection limit security rules for IPv4 addresses.
The firewall connection limit policy allows or denies traffic based on a matching tuple: source address, destination address, and service; and connection count. The purpose is to detect anomalous connection requests.
The limit you specify can be based on the following counts:
Count of concurrent sessions that match the tuple.
Count of concurrent sessions from a single host that match the tuple.
The FortiADC system evaluates firewall connection limit policy rules before other rules. It matches traffic against the connection limit table, beginning with the first rule. If no rule matches, the connection is forwarded for further processing. If a rule matches, and the limit has not been reached, the connection is forwarded for further processing. If a rule matches and the limit has been reached, the connection is dropped.
By default, if firewall connection limit rules are not configured, the system does not perform connection limit policy processing. The firewall connection limit can be configured for non-SLB traffic and for Layer 7 SLB traffic, but not Layer 4 SLB traffic.
Note: The purpose of the firewall connection limit is distinct from the virtual server connection limit. The firewall connection limit setting is a security setting; the virtual server connection limit is a capacity setting.
Before you begin:
You must have a good understanding and knowledge of the capacity of your backend servers.
You must have created the address configuration objects and service configuration objects that define the matching tuple in your connection limit rules.
You must have read-write permission for firewall settings.
config firewall connlimit
config rule
edit <name>
set connection-limit <integer>
set destination-address <datasource>
set in-interface <datasource>
set out-interface <datasource>
set service <datasource>
set source-address <datasource>
set type {host | rule}
set side {both | destination | source}
Maximum concurrent sessions. The default is 1,048,576.
Destination address object to use to form the matching tuple.
Interface that receives traffic.
Interface that forwards traffic.
Service object to use to form the matching tuple.
Source address object to use to form the matching tuple.
Whether the limit is per rule or per host.
When the connection limit is per host, specify whether the connection counter gets incremented when the host IP address appears in:
source—Only increment the counter if the host is the source address.
destination—Only increment the counter if the host is the destination address.
both—Increment the counter if the host is the source or destination address.
FortiADC-VM # config firewall connlimit
FortiADC-VM (connlimit) # config rule
FortiADC-VM (rule) # edit dest-rule
Add new entry 'dest-rule' for node 1890
FortiADC-VM (dest-rule) # get
in-interface :
out-interface :
source-address :
destination-address :
service :
type : host
side : both
connection-limit : 1048576
FortiADC-VM (dest-rule) # set in-interface port4
FortiADC-VM (dest-rule) # set out-interface port5
FortiADC-VM (dest-rule) # set destination-address fw-dest-addr1
FortiADC-VM (dest-rule) # set service fw-http
FortiADC-VM (dest-rule) # set type rule
FortiADC-VM (dest-rule) # end