Specifications

Chapter 4: Configuring the High-Level Network
4-28
Alternatively, you can perform the encoding using the following equation
for address (a.b.c.d):
d*(256^3) + c*(256^2) + b*256 +a
The way to encode the port is to take the two bytes that store the port and
reverse them. So, port 80 becomes 80 * 256 + 0 = 20480. Port 1433 (instead
of 5 * 256 + 153) becomes 153 * 256 + 5 = 39173.
To activate Passive mode cookie persistence using the
Configuration utility
After you set up the cookie created by the web server, you must activate
Passive mode on the BIG-IP.
1. In the navigation pane, click Pools.
The Pools screen opens.
2. In the Pools list, click the pool for which you want to set up Passive
mode.
The properties screen for the pool you clicked opens.
3. Click the Persistence tab.
The Persistence screen opens.
4. Select Passive HTTP Cookie mode.
5. Click the Apply button.
To activate Passive mode cookie persistence from the
command line
After you set up the cookie created by the web server, you must activate
Passive mode on the BIG-IP. To activate HTTP cookie persistence from the
command line, use the following syntax:
b pool <pool_name> { \
<lb_mode_specification> \
persist_mode cookie \
cookie_mode passive \
<member definition> }
Note
The <timeout> value is not used in Passive mode.
Hash mode
If you specify Hash mode, the hash mode consistently maps a cookie value
to a specific node. When the client returns to the site, the BIG-IP uses the
cookie information to return the client to a given node. With this mode, the
web server must generate the cookie. The BIG-IP does not create the cookie
automatically as it does with Insert mode.