F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Access Control Configuration Guide-6PW100

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99BNumbering and naming ACLs
Each ACL category has a unique range of ACL numbers. When creating an ACL, you must assign it a
number. In addition, you can assign the ACL a name for ease of identification. After creating an ACL with
a name, you cannot rename it or delete its name.
For an IPv4 basic or advanced ACLs, its ACL number and name must be unique in IPv4, and for an IPv6
basic or advanced ACL, its ACL number and name must be unique in IPv6.
100BMatch order
The rules in an ACL are sorted in a specific order. When a packet matches a rule, the device stops the
match process and performs the action defined in the rule. If an ACL contains overlapping or conflicting
rules, the matching result and action to take depend on the rule order.
The following ACL match orders are available:
• config—Sorts ACL rules in ascending order of rule ID. A rule with a lower ID is matched before a
rule with a higher ID. If you use this approach, carefully check the rules and their order.
• auto—Sorts ACL rules in depth-first order. Depth-first ordering makes sure any subset of a rule is
always matched before the rule.
544HTable 1 lists the sequence of tie breakers that depth-first ordering
uses to sort rules for each type of ACL.
Table 1 Sorting ACL rules in depth-first order
ACL cate
g
or
y
Se
q
uence of tie breakers
IPv4 basic ACL
1. VPN instance
2. More 0s in the source IP address wildcard (more 0s means a narrower IP
address range)
3. Rule configured earlier
IPv4 advanced ACL
4. VPN instance
5. Specific protocol type rather than IP (IP represents any protocol over IP)
6. More 0s in the source IP address wildcard mask
7. More 0s in the destination IP address wildcard
8. Narrower TCP/UDP service port number range
9. Rule configured earlier
IPv6 basic ACL
10. VPN instance
11. Longer prefix for the source IP address (a longer prefix means a narrower IP
address range)
12. Rule configured earlier
IPv6 advanced ACL
13. VPN instance
14. Specific protocol type rather than IP (IP represents any protocol over IPv6)
15. Longer prefix for the source IPv6 address
16. Longer prefix for the destination IPv6 address
17. Narrower TCP/UDP service port number range
18. Rule configured earlier
Ethernet frame header ACL
19. More 1s in the source MAC address mask (more 1s means a smaller MAC
address)
20. More 1s in the destination MAC address mask
21. Rule configured earlier