Accton Technology 24/48-Port, ES4548D, ES4524D manual 15-4

15 Access Control Lists

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

•Source/Destination Port Bit Mask – Decimal number representing the port bits to match. (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 Bit Mask – 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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