Manual Chapter :
Setting Connection Limits
Applies To:
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BIG-IP APM
- 17.0.0
BIG-IP Link Controller
- 17.0.0
BIG-IP Analytics
- 17.0.0
BIG-IP LTM
- 17.0.0
BIG-IP PEM
- 17.0.0
BIG-IP AFM
- 17.0.0
BIG-IP DNS
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BIG-IP ASM
- 17.0.0
Setting Connection Limits
Overview: About connection limits
You can configure a virtual server, pool member, or node to prevent an excessive number of connection requests
during events such as a Denial of Service (DoS) attack or a planned, high-demand traffic event.
To ensure the availability of a virtual server, pool member, or node, you can use the BIG-IP
Local Traffic Manager to manage the total number of connections and the rate
at which connections are made.
When you specify a connection limit, the system prevents the total number of concurrent
connections to the virtual server, pool member, or node from exceeding the specified number.
When you specify a connection rate limit, the system controls the number of allowed new
connections per second, thus providing a manageable increase in connections without compromising
availability.
Limiting connections for a virtual server, pool member, or node
You can improve the availability of a virtual server, pool member, or node by using the BIG-IP
Local Traffic Manager to specify a connection limit and a
connection rate limit.
- On the Main tab, expandLocal Traffic, and then clickVirtual Servers,Pools, orNodes.
- Click the name of the virtual server, pool, or node you want to modify.
- For virtual servers only, from theConfigurationlist, selectAdvanced.
- In theConnection Limitfield, type a number that specifies the maximum number of concurrent open connections.
- In theConnection Rate Limitfield, type a number that specifies the number of new connections accepted per second for the virtual server.
- ClickUpdateto save the changes.
After configuring connection and connection rate limits on a virtual server, or
after configuring these limits on a pool member or node associated with a virtual
server, the system controls the total number of concurrent connections and the rate of
new connections to the virtual server, pool member, or node.
Implementation results
Configuring a connection limit or a connection rate limit for a virtual server, pool member, or node prevents an excessive number of connection requests during events such as a Denial of Service (DoS) attack or a planned, high-demand traffic event. In this way, you can manage the total number of connections to a virtual server, pool member, or node, as well as the rate at which connections are made. When you specify a connection rate limit, the system controls the number of allowed new connections per second, thus providing a manageable increase in connections without compromising availability.
