User`s guide

Packet Filtering on the OnSite
68
AlterPath OnSite Administrator’s and User’s Guide
TCP Protocol Options
If you select TCP as the protocol when specifying a rule, you can define the
following options.
UDP Protocol Options
When you select UDP as a protocol when specifying a rule, you can select the
UDP options defined in the following table.
ICMP Protocol Options
When you select ICMP as a protocol when specifying a rule, you can select
the following ICMP options.
•all
• echo-reply
Table 1-32: TCP Protocol Packet Filtering Options
Field/Menu Option Definition
Source Port
- OR -
Destination Port
You can specify a source or destination port number for filtering in
the “Source Port” or “Destination Port” field. You can also specify
a second number, so that TCP packets are filtered for any port
number within the range starting with the first number and ending
with the second.
TCP Flags
Specifying any of the flags: “SYN” (synchronize), “ACK”
(acknowledge), “FIN” (finish), “RST” (reset), “URG” (urgent) or
“PSH” (push), and one of the “Any,” “Set,” or “Unset” conditions,
filters TCP packets for the specified flag and the selected
condition.
Table 1-33: UDP Protocol Packet Filtering Options
Field Definition
Source Port
- OR -
Destination Port
Specify a source or destination port number for filtering in the
“Source Port” or “Destination Port” field.
You can specify a source or destination port number for filtering in
the “Source Port” field. You can also specify a second number so
that UDP packets are filtered for any port number within the range.