SignaMax SC30010, Справочное руководство CLI

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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)
flag-bitmask – Decimal number representing the code bits to
match.
time-range-name - Name of the time range. (Range: 1-16
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.
◆
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”
◆ If an Extended IPv4 rule and MAC rule match the same packet, and these
rules specify a “permit” entry and “deny” entry, the “deny” action takes
precedence.