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Virtual servers

BIG-IP® Reference Guide 4-83

Each of these elements is described in Table 4.16.

Turning software acceleration off for virtual servers using IPFW rate filters

The software acceleration feature speeds packet flow for TCP connections

when the packets are not fragmented. For configurations with no IPFW rate

filter present, software acceleration is turned on by default by giving the

global variable fastflow_active a default value of auto. The variable

fastflow_active auto enables acceleration globally if IPFW filters are not

present, and disables it globally if IPFW filters are present. (This is because,

with acceleration on, IPFW only examines the first SYN packet in any given

connection, rather than filtering all packets.) If you want to turn on

acceleration globally but turn it off for the specific virtual servers that use

IPFW rate filters, you must change the fastflow_active setting from auto to

on, then disable the virtual servers individually using the bigpipe virtual

<ip>:<service> accelerate disable command.

To set software acceleration controls from the command

line

To enable software acceleration globally in a way that can be overridden for

individual virtual servers, set the bigpipe global variable fastflow_active to

on with the following command:

b global fastflow_active on

Then, to disable software acceleration for individual virtual servers that use

IPFW rate filtering, use the following bigpipe command:

b virtual <ip>:<service> accelerate disable

For example, if you want to turn acceleration off for the virtual server

10.10.10.50:80, type the following command:

b virtual 10.10.10.50:80 accelerate disable

You can define a virtual server with acceleration disabled using the

following syntax:

b virtual <ip>:<service> use pool the_pool accelerate disable

Rule element Description

<virt_serv_key> A virtual server key definition:

<virtual_address>:<virt_port> [unit <ID>]

<virt_options> Virtual server options. For more information, see Virtual server options, on page 4-77.

<rule_name_reference> A rule name reference. Rule names are strings of 1 to 31 characters.

use rule <rule_name>

Table 4.16 The command line rule elements

1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 425 426

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