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Chapter 4: Configuring the High-Level Network

4-52

IP addresses

You can specify the client_addr or the server_addr variable within a rule

to select a pool. For example, if you want to load balance based on part of

the client’s IP address, you might want a rule that states:

“All client requests with the first byte of their source address equal to 206

will load balance using a pool named clients_from_206 pool. All other

requests will load balance using a pool named other_clients_pool.”

Figure 4.20 shows a rule that implements the preceding statement.

Figure 4.20 A rule based on the client IP address variable

For additional examples of rules using IP packet header information, see

Additional rule examples, on page 4-65.

Port numbers

BIG-IP includes rule variables that you can use to select a pool based on the

port number of the client or server. These variables are client_port and

server_port.

To configure a rule to select a pool based on a port number, use the syntax

shown in the example in Figure 4.21.

Figure 4.21 A rule based on a TCP or UDP port number

IP protocol numbers

BIG-IP includes a rule variable, ip_protocol, that you can use to select a

pool based on an IP protocol number.

rule clients_from_206_rule {

if ( client_addr equals 206.0.0.0 netmask 255.0.0.0 ) { {

use ( clients_from_206 )

}

else {

use ( other_clients_pool )

}

rule my_rule {

if (client_port > 1000) {

use (slow_pool)

}

else {

use (fast_pool)

}

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