Chapter 12
| Security Measures
Access Control Lists
– 329 –
■
4 (rst) – Reset
■
8 (psh) – Push
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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, control bit mask 2
■
Both SYN and ACK valid, use control-code 18, control bit mask 18
■
SYN valid and ACK invalid, use control-code 2, control bit mask 18
◆ Time Range – Name of a time range.
Web Interface
To add rules to an IPv4 Extended ACL:
1. Click Security, ACL.
2. Select Configure ACL from the Step list.
3. Select Add Rule from the Action list.
4. Select IP Extended from the Type list.
5. Select the name of an ACL from the Name list.
6. Specify the action (i.e., Permit or Deny).
7. Select the address type (Any, Host, or IP).
8. If you select “Host,” enter a specific address. If you select “IP,” enter a subnet
address and the mask for an address range.
9. Set any other required criteria, such as service type, protocol type, or control
code.
10. Click Apply.
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