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Rules

BIG-IP® Reference Guide 4-51

Rules normally run right after the BIG-IP receives a packet that does not

match a current connection. However, in the case of an HTTP request, the

first packet is a TCP SYN packet that does not contain the HTTP request. In

this case, the BIG-IP proxies the TCP handshake with the client and begins

evaluating the rule again when the packet containing the HTTP request is

received. When a pool has been selected and a server node selected, the

BIG-IP proxies the TCP handshake with the server node and then passes

traffic normally.

For examples of rules that select pools based on header information inserted

into HTTP requests by an SSL Accelerator proxy, see Inserting headers into

HTTP requests, on page 4-95.

Pool selection based on IP packet header data

In addition to specifying the HTTP variables within a rule, you can also

select a pool by specifying IP packet header information within a rule. The

types of information you can specify in a rule are:

• Client IP address

• Server IP address

• Client port number

• Server port number

• IP protocol number

•QoS level

• ToS level

To specify IP packet header variables within a rule using the

Configuration utility

1. In the navigation pane, click Rules.

2. Click the Add button.

3. In the Name box, enter a unique name for the rule.

4. In the Type box, click the button for Rule Builder.

5. Click Next.

6. Select a variable on the left side of the screen.

7. Fill in all information within the row.

8. Click Next.

9. Select Discard.

10. Click Next.

11. Select No Action or Discard from the box.

12. Click Done.

The following sections describe the specific types of IP packet header data

that you can specify within a rule.

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