Lantronix LSB4, Reference Manual, Page: 38 / 74

Filter Commands LSB4 Reference Manual
6-8
Set/Define Filter (cont.)
Parameters Protocol identifier (cont.)
For example, if the following command is entered [Figure 6-8]:
Figure 6-8: Allowing TCP Packets
TCP/IP protocol data packets, including the TCP's level three
protocol data packets, will be permitted passage through the
LSB4.
If the command below is then entered [Figure 6-9]:
Figure 6-9: Preventing IP Packets
all IP data packets containing all of its level two and three pro-
tocols will be denied passage through the LSB4, with the ex-
ception of the TCP/IP data packets allowed by the preceding
command.
It is important to note that if the order of the two command ex-
amples above were reversed, the results would be different.
No IP data packets would be passed by the switch regardless
of the subsequent filter command.
If the information on Protocol identifier is not completely
clear, please review the syntax representation on page 6-9.
The syntax shows the many combinations of protocols, sub-
protocols, and sub-sub-protocols.
LOCAL> SET FILTER 1 APPEND PROTOCOL IP TCP ALLOW
Local> SET FILTER 1 APPEND PROTOCOL IP DENY