SMC Networks SMC6752AL2 manual Default Setting, Extended ACL

ACCESS CONTROL LIST COMMANDS

Default Setting

None

Command Mode

Extended ACL

Command Usage

•All new rules are appended 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.

•You can specify both Precedence and ToS in the same rule. However,

if DSCP is used, then neither Precedence nor ToS can be specified.

•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”

Both SYN and ACK valid, use “control-code 18 18” SYN valid and ACK invalid, use “control-code 2 18”

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