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11 - 14 Aironet 340 Series Bridge
Adding IP protocol Sub-Filters
Once you have added a filter for the IP protocol you may also filter
packets based on their UDP or TCP port number, their IP sub-protocol
(i.e., UDP/TCP/ICMP) or based on an IP address range.
To filter based on an IP sub- protocol use add ip_subprotocol. You are
then prompted as to whether you want to filter tcp or udp or another protocol
based on its ID number. Finally you are prompted for a filter
action as in the other manual filters.
To filter based on port number use add ip_port. You are prompted as to
whether you want to filter a TCP or UDP source or destination port. You
are then prompted for the port number and the action associated with it.
To filter based on an IP address range use add ip_address. You are
prompted as to whether you want to filter a source or destination address
and then for an IP address and address mask and a filter action. The filter
matches if the value of both the packet address and the filter address
ANDED with the filter mask are equal.
Removing an Entry (Remove)
Use the remove option to remove a protocol filter entry. You may either
remove all filters by entering the keyword “all” or a single entry by
entering the number assigned to the filter and shown at the start of the
line in the filter display.
Length of Data Displayed in Log Action (Length)
Use the length option to display the contents of packets being forwarded
to the radio.
Use this option to setup the filter mask values to properly narrow down
which packets are filtered.
If you add a protocol filter whose action is “log,” each time the filter
matches, the contents of the data portion of the packet (after the MAC
header) will be displayed on the console (in hexadecimal) for a length in
bytes determined by the value of this option.