AMX NXA-ENET24 Instruction Manual page 283

Default Setting
Command Mode
Command Usage
Example
This example accepts any incoming packets if the source address is within subnet 10.7.1.x. For
example, if the rule is matched; i.e., the rule (10.7.1.0 & 255.255.255.0) equals the masked address
(10.7.1.2 & 255.255.255.0), the packet passes through.
Console(config-ext-acl)#permit 10.7.1.1 255.255.255.0 any
Console(config-ext-acl)#
NXA-ENET Software Management Guide
flag-bitmask – Decimal number representing the code bits to match.
* Includes TCP, UDP or other protocol types.
None
Extended ACL
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"
Command Line Interface
267