Manual Chapter : Setting Connection Limits

Applies To:

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BIG-IP DNS

  • 15.0.1, 15.0.0

BIG-IP PEM

  • 15.0.1, 15.0.0

BIG-IP AFM

  • 15.0.1, 15.0.0

BIG-IP Analytics

  • 15.0.1, 15.0.0

BIG-IP ASM

  • 15.0.1, 15.0.0

BIG-IP AAM

  • 15.0.1, 15.0.0

BIG-IP APM

  • 15.0.1, 15.0.0

BIG-IP LTM

  • 15.0.1, 15.0.0
Manual Chapter

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.
  1. On the Main tab, expand
    Local Traffic
    , and then click
    Virtual Servers
    ,
    Pools
    , or
    Nodes
    .
  2. Click the name of the virtual server, pool, or node you want to modify.
  3. For virtual servers only, from the
    Configuration
    list, select
    Advanced
    .
  4. In the
    Connection Limit
    field, type a number that specifies the maximum number of concurrent open connections.
  5. In the
    Connection Rate Limit
    field, type a number that specifies the number of new connections accepted per second for the virtual server.
  6. Click
    Update
    to 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.