SMC Networks 100BASE-TX, 16 10BASE-T manual Configuring an Extended IP ACL

3 Configuring the Switch

Configuring an Extended IP ACL

Command Attributes

•Action – An ACL can contain either all permit rules or all deny rules. (Default: Permit rules)

•Source/Destination Address Type – Specifies the source or destination IP address. Use “Any” to include all possible addresses, “Host” to specify a specific host address in the Address field, or “IP” to specify a range of addresses with the Address and SubMask fields. (Options: Any, Host, IP; Default: Any)

•Source/Destination Address – Source or destination IP address.

•Source/Destination Subnet Mask – Subnet mask for source or destination address. (See the description for Subnet Mask on page 3-55.)

•Service Type – Packet priority settings based on the following criteria:

-Precedence – IP precedence level. (Range: 0-8)

-TOS – Type of Service level. (Range: 0-16)

-DSCP – DSCP priority level. (Range: 0-64)

•Protocol – Specifies the protocol type to match as TCP, UDP or Others, where others indicates a specific protocol number (0-255). (Options: TCP, UDP, Others; Default: TCP)

•Source/Destination Port – Source/destination port number for the specified protocol type. (Range: 0-65535)

•Control Code – Decimal number (representing a bit string) that specifies flag bits in byte 14 of the TCP header. (Range: 0-63)

•Control Code Bitmask – Decimal number representing the code bits to match. The control bitmask is a decimal number (for an equivalent binary bit mask) that is applied to the control code. Enter a decimal number, where the equivalent binary bit “1” means to match a bit and “0” means to ignore a bit. The following bits may be specified:

-1 (fin) – Finish

-2 (syn) – Synchronize

-4 (rst) – Reset

-8 (psh) – Push

-16 (ack) – Acknowledgement

-32 (urg) – Urgent pointer

For example, use the code value and mask below to catch packets with the following flags set:

-SYN flag valid, use control-code 2, control bitmask 2

-Both SYN and ACK valid, use control-code 18, control bitmask 18

-SYN valid and ACK invalid, use control-code 2, control bitmask 18

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