3Com 3CRDSF9PWR-US - OfficeConnect Managed Fast Ethernet PoE Switch User Manual page 91

Add Rules to ACL
Protocol — Defines the protocol in the rule to which the packet is
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matched. The possible fields are:
Select from List — Selects a protocol from a list by which packets
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are matched.
Protocol ID — Adds user-defined protocols by which packets are
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matched. Each protocol has a specific protocol number which is
unique. The possible field range is 0-255.
Source Port — Defines the source port that is used for matched
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packets. Enabled only when TCP or UDP are selected in the Protocol
list. The field value is either user defined or Any. If Any is selected the
IP based ACL is applied to any source port.
Destination Port — Defines the destination port that is used for
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matched packets. Enabled only when TCP or UDP are selected in the
Protocol list. The field value is either user defined or Any. If Any is
selected, the IP based ACL is applied to any destination port.
TCP Flags — If checked, enables configuration of TCP flags matched
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to the packet. The possible fields are:
URG — Urgent pointer field significant. The urgent pointer points
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to the sequence number of the octet following the urgent data.
ACK — Acknowledgement field significant. The acknowledgement
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field is the byte number of the next byte that the sender expects to
receive from the receiver.
PSH — Push (send) the data as soon as possible, without buffering.
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This is used for interactive traffic.
RST — Reset the connection. This invalidates the sequence
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numbers and aborts the session between the sender and receiver.
SYN — Synchronize Initial Sequence Numbers (ISNs). This is used to
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initialize a new connection.
FIN — Finish. This indicates there is no more data from the sender.
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This marks a normal closing of the session between the sender and
receiver.
For each TCP flag, the possible field values are:
Set — Enables the TCP flag.
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Unset — Disables the TCP flag.
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Don't Care — Does not check the packet's TCP flag.
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Defining Access Control Lists 91