SMC Networks SMC6724L3 manual Extended ACL

COMMAND LINE INTERFACE

•host – Keyword followed by a specific IP address.

•source-port– TCP/UDP source port number. (Range: 0-65535)

•destination-port– TCP/UDP destination port number. (Range:

0-65535)

•protocol-number– A specific protocol number. (Range: 0-255)

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

•code-bitmask– Decimal number representing the code bits to match.

Default Setting

None

Command Mode

Extended ACL

Command Usage

•All new rules are added to the end of the list.

•Address bitmasks are similar to a subnet mask, containing four integers from 0 to 255, each separated by a period. The binary mask uses 1 bits to indicate “match” and 0 bits to indicate “ignore.” The bitmask is bitwise ANDed with the specified source IP address, and then compared with the address for each IP packet entering the port(s) to which this ACL has been assigned.

•The control-code bitmask is a decimal number (representing an equivalent 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 2”

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