Net Optics Director - Manual (Page 32)

Director
28
Create Filters
Filters process a traffic stream by selecting packets based on criteria in the packet header. A filter is defined using a
filter add command, which also specifies the Network ports and Monitor ports the filters apply to. The filter add
command specifies the following behavior:
Traffic is aggregated from all the listed Network ports •
Then the filter parameters are applied •
Packets which match all of the specified filter parameters are copied to all of the listed Monitor ports, assuming •
the action=redir.
If the action=drop, the matching packets are not copied to any Monitor port; this mechanism is used to create •
exclusive filters.
To send Monitor Port 1 all traffic received at Network Port 5 from IP addresses 192.168.10.0 to 192.168.10.15:
Enter 1. filter add in_ports=n1.5 ip_src=192.168.10.0 ip_src_mask= 255.255.255.240 action=redir redir_
ports=m.1. A filter has been defined to select all IPv4 packets from Network Port 5 with a source IP addresses
of 192.168.10.0 and the lowest four address bits masked out (ignored); packets matching the filter are copied to
Monitor Port 1.
Enter 2. filter commit. The filter is activated.
Network Port 5 Monitor Port 1
Source IP =
192.168.10.0 -
192.168.10.15
filter add in_ports=n1.5 ip_src=192.168.10.0 ip_src_mask=255.255.255.240 action=redir redir_ports=m.1
Simple IP address filter Figure 26:
To create a filter that selects IPv4 packets by protocol:
Enter 1. filter add in_ports=n1.3 ip4_prot=3 action=redir redir_ports=m.6,m.8. A filter has been defined to select
all IPv4 packets that use the TCP protocol received at Network Port 3 and copy them to Monitor Port 6 and Monitor
Port 8. (Protocols are designated by an industry-standard numbering system. See Appendix C for details.)
Enter 2. filter commit. The filter is activated.
Network Port 3
Protocol =
TCP
Monitor Port 6
Monitor Port 8
filter add in_ports=n1.3 ip4_prot=3 action=redir redir_ports=m.6,m.8
Simple IPv4 protocol filter (with regeneration) Figure 27:
Available filter parameters are listed in Appendix B and include:
ip_proto IP protocol •