SMC Networks SMC8724M Manual do Utilizador descarregar pdf (Página 393)

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OMMANDS

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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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SMC Networks SMC8724M Manual do Utilizador Página 393

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