CLI Reference Guide-R04

Chapter 10 | Access Control Lists
IPv4 ACLs
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port-bitmask – Decimal number representing the port bits to match.
(Range: 0-65535)
control-flags – Decimal number (representing a bit string) that specifies flag
bits in byte 14 of the TCP header. (Range: 0-63)
Note: control-flags is only available with the TCP option
flag-bitmask – Decimal number representing the code bits to match.
time-range-name - Name of the time range. (Range: 1-32 characters)
Default Setting
None
Command Mode
Extended IPv4 ACL
Command Usage
◆ All new rules are appended to the end of the list.
◆ Address bit masks 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 bit mask 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 as long as
Precedence is specified first. However, if DSCP is used, then neither Precedence
nor ToS can be specified.
◆ The control-code bitmask (tcp only parameter: control-flag control-flags flag-
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”