Net Optics Smart Filtering none - Manual (Page 52)

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Director
Filter parameters
Switches and filters are defined using the filter add and filter ins commands. The filter add command syntax is:
filter add in_ports=<portlist> <filter_parameter_list> action=<redir|drop> redir_ports=<portlist>
The <filter_parameter_list> is a sequence of zero or more of the filter qualifiers as listed in the following table.
If the <filter_parameter_list> is empty, the filter add command specifies an aggregation of the traffic received on all of
the in_ports. If the action=redir, the aggregated traffic stream is regenerated to all of the redir_ports.
If the <filter_parameter_list> contains filters, aggregation and regeneration take place as described in the previous
paragraph. However, the filters are applied to the aggregated traffic stream before it is copied to the Monitor ports. If
multiple filter qualifiers are specified, a packet must satisfy all of the filter qualifiers in order to be copied to the Moni-
tor ports. In other words, the filter qualifiers are combined with a logical AND condition. A logical OR condition can be
created by using multiple filter add commands with identical port lists.
The filter add and filter ins commands define filters but do not activate them. A subsequent filter commit or commit
command must be executed to the filters. This mechanism enables an interrelated group of filters to be activated simul-
taneously. It also allows you to double-check your filter definitions before you activate them.
It is important to note that packets are filtered using a Content Addressable Memory or CAM. Each filter is a CAM
entry, and the CAM is filled in the order that the filter add commands are received. Filter ins commands create filters
in specific locations in the CAM. When a packet is processed, the first filter in the CAM that matches the packet is the
only filter that is activated. Each packet can activate exactly zero or one filters. See Understand filter interactions
near the end of Chapter 3 for examples.
All supported filter qualifiers are shown in the following table.
Director Filter Parameters
<qual> <value> Example Description
ip_src IPv4 address ip_src=168.10.4.1 IP source address
ip_src_mask IPv4 address mask ip_src_mask=255.255.255.0 Mask for IP source address
ip_dst IPv4 address ip_dst=1234:5678::9abc IP destination address
ip_dst_mask IPv4 address mask ip_dst_mask=255.255.255.0 Mask for IP destination address
ip_proto Number* ip_proto=6 Layer 4 IP protocol
l4_src_port Port number l4_src_port=80 Layer 4 source port
l4_dst_port Port number l4_dst_port=80 Layer 4 destination port
vlan VLAN number vlan=128 VLAN
* See Appendix C for a complete list of protocol numbers. Some common protocols include:
Number Keyword Protocol
1 ICMP Internet Control Message Protocol
2 IGMP Internet Group Message Protocol
6 TCP Transmission Control Protocol
17 UDP User Datagram Protocol
89 OSPF Open Shortest Path First
132 SCTP Stream Control Transmission Protocol