Avaya BCM 4.0 Networking Guía de configuración Pagina 645

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Chapter 67 Configuring IP Filter Rules 645
BCM 4.0 Networking Configuration Guide
Configuring the order of the inbound and outbound filters for an
interface
When you create filters, you assign the order in which the filters are applied.
The order of the filter rules is very important. The more specific rules, such as rules for specific
port numbers and addresses, should be placed first. TCP and UDP rules are typically more specific
and should be first. Rules for just the IP protocol should be placed last, because they typically
ignore port numbers and only match on IP addresses.
The following two examples show how the order of the rules affects what traffic can pass through
the IP Firewall when the Use first match check box is selected.
Example 1: Rule 1 is configured to Pass TCP protocol 25 from any IP address to 10.10.10.20.
Rule 2 is configured to Block any TCP protocol from any IP address to any IP address. If Rule 2 is
placed before Rule 1, then Rule 1 will never be reached because all TCP protocol 25 packets
destined for IP address 10.10.10.20 will be blocked by Rule 2 first.
Example 2: Rule 1 is configured to Pass TCP protocol 6800 from IP address 192.168.10.20 to IP
address 10.10.10.20. Rule 2 is configured to Block all IP protocols from any IP address to any IP
address. If Rule 2 is placed before Rule 1, all TCP packets will match Rule 2 first and will be
blocked.
To configure the order of the inbound filters
1 Click the Inbound Filter Rule tab.
The Inbound Filter Rule details panel appears.
2 Select the rule that you want to move.
3 Click Modify.
The Modify Inbound Filter Rule dialog box appears.
4 Enter the new sequence number.
5 Click OK.
To configure the order of the outbound filters
1 Click the Outbound Filter Rules tab.
The Outbound Filter Rules details panel appears.
2 Select the rule that you want to move.
3 Click Modify.
The Modify Outbound Filter Rule dialog box appears.
4 Enter the new sequence number.
5 Click OK.
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