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Chapter 4: Configuring the High-Level Network

4-30

The <cookie_name>, <cookie_value_offset>, and <cookie_value_length>

values are described in Table 4.5.

SSL persistence

SSL persistence is a type of persistence that tracks SSL connections using

the SSL session ID, and it is a property of each individual pool. Using SSL

persistence can be particularly important if your clients typically have

translated IP addresses or dynamic IP addresses, such as those that Internet

service providers typically assign. Even when the client’s IP address

changes, the BIG-IP still recognizes the connection as being persistent based

on the session ID.

You may want to use SSL persistence and simple persistence together. In

situations where an SSL session ID times out, or where a returning client

does not provide a session ID, you may want the BIG-IP to direct the client

to the original node based on the client’s IP address. As long as the client’s

simple persistence record has not timed out, the BIG-IP can successfully

return the client to the appropriate node.

You can set up SSL persistence from the command line or using the

Configuration utility. To set up SSL persistence, you need to do two things:

• Turn SSL persistence on.

• Set the SSL session ID timeout, which determines how long the BIG-IP

stores a given SSL session ID before removing it from the system.

Note

Do not enable SSL persistence on pools that load balance plain-text traffic,

that is, traffic resulting from SSL proxies on which SSL termination is

enabled.

To activate SSL persistence from the command line

1. In the navigation pane, click Pools.

The Pools screen opens.

2. Click the appropriate pool in the list.

The Pool Properties screen opens.

3. Click the Persistence tab.

The Persistence screen opens.

Hash mode values Description

<cookie_name> This is the name of an HTTP cookie being set by a Web site.

<cookie_value_offset> This is the number of bytes in the cookie to skip before calculating the hash value.

<cookie_value_length> This is the number of bytes to use when calculating the hash value.

Table 4.5 The cookie hash mode values

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 425 426

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