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Chapter 4: Configuring the High-Level Network

4-80

Again, even when you define a custom netmask and broadcast in a specific

network virtual server definition, the settings apply to all virtual servers that

use the same virtual address. The following sample command shows a

user-defined netmask and broadcast:

b virtual www.SiteOne.com:http \

netmask 255.255.0.0 \

broadcast 10.0.140.255 \

use pool my_pool

The /bitmask option shown in the following example applies network and

broadcast address masks. In this example, a 24-bit bitmask sets the network

mask and broadcast address for the virtual server:

b virtual 206.168.225.0:80/24 use pool my_pool

You can generate the same broadcast address by applying the 255.255.255.0

netmask. The effect of the bitmask is the same as applying the

255.255.255.0 netmask. The broadcast address is derived as

206.168.225.255 from the network mask for this virtual server.

Setting a connection limit

The default setting is to have no limit to the number of concurrent

connections allowed on a virtual server.

To set a concurrent connection limit

You can set a concurrent connection limit on one or more virtual servers

using the following command:

b virtual <virt_ip> [:<service>] \ [...<virt_ip>[:<service>]] limit <max_conn>

The following example shows two virtual servers set to have a concurrent

connection limit of 5000 each:

b virtual www.SiteOne.com:http www.SiteTwo.com:ssl limit 5000

To turn off the connection limit

To turn off the connection limit, set the <max conn> variable to zero:

b virtual <virt_ip>[:<service>] [...<virt_ip>[:<service>] ] limit 0

Setting translation properties for virtual addresses and ports

Turning off port translation for a virtual server is useful if you want to use

the virtual server to load balance connections to any service.

You can also configure the translation properties for a virtual server address.

This option is useful when the BIG-IP is load balancing devices that have

the same IP address. This is typical with the nPath routing configuration

where duplicate IP addresses are configured on the loopback device of

several servers.

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