Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 103
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ServerIron ADX NAT64 Configuration Guide 91
53-1002444-02
ACLs and ICMP
5
DRAFT: BROCADE CONFIDENTIAL
• The ACL packet counter feature provides an accurate count of packets matching individual ACL
entries.
• The ACL flow counter feature provides an approximate count of flows matching individual ACL
entries. This feature can be used for troubleshooting purposes to provide an indication of flow
activity against an ACL. Each time the Foundry device receives the first packet of a flow
matching an entry in an ACL list, the flow counter for that ACL entry is incremented by one. If a
flow lasts longer than two minutes, the flow counter for the ACL entry is incremented again.
NOTE
The ACL flow counter feature is designed to monitor the general volume of flow activity for an
ACL. It is not intended to be used for accounting purposes.
The ACL flow and packet counters are incremented differently depending on whether packets are
handled by the Management Processor (MP), and whether they are permit or deny flows.
The Management Processor (MP) handles flows as follows.
For flows handled by the Management Processor:
• For permit flows, only flows are counted. If a permit flow lasts longer than two minutes, the flow
counter is incremented again.
• For deny flows, only packets are counted.
Once the ACL packet and flow counters are enabled, you can disable them with the no form of the
enable-acl-counter command. Disabling and then re-enabling the ACL packet and flow counters
resets them to zero.
To display the packet and flow counters for ACL 100.
Syntax: show access-list <acl-num> | <acl-name> | all
To clear the flow counters for ACL 100.
ServerIronADX# clear access-list 100
Syntax: clear access-list <acl-num> | <acl-name> | all
ACLs and ICMP
This section describes how ACLs can be used to filter traffic based on ICMP packets.
Using flow-based ACLs to filter ICMP packets
To configure an extended ACL that filters based on the IP packet length of ICMP packets, enter
commands such as the following.
ServerIronADX(config)#access-list 105 deny icmp any any echo ip-pkt-len 92
ServerIronADX(config)#access-list 105 deny icmp any any echo ip-pkt-len 100
ServerIronADX(config)#access-list 105 permit ip any any
ServerIronADX# show access-list 100
Extended IP access list 100 (Total flows: 432, Total packets: 42000)
permit tcp 1.1.1.0 0.0.0.255 any (Flows: 80, Packets: 12900)
deny udp 1.1.1.0 0.0.0.255 any (Flows: 121, Packets: 20100)
permit ip 2.2.2.0 0.0.0.255 any (Flows: 231, Packets: 9000)
- ServerIron ADX 1
- Document History 2
- Contents 3
- About This Document 9
- Command syntax conventions 10
- Notice to the reader 11
- Related publications 11
- Getting technical help 11
- NAT64 and NAT46 Overview 13
- Stateless NAT46 translation 14
- Protocol support 15
- NAT64 fragmentation support 17
- References 18
- Stateful NAT64 Configuration 19
- Operation of stateful NAT64 20
- 53-1002444-02 23
- Enabling connection logging 28
- Displaying NAT64 information 31
- Displaying NAT64 translations 32
- Displaying NAT64 statistics 33
- Displaying NAT64 resources 37
- Stateless NAT64 Configuration 39
- Operation of stateless NAT64 40
- High availability for NAT64 52
- Clearing NAT64 information 53
- Stateless NAT46 Configuration 55
- Operation of stateless NAT46 56
- High availability for NAT46 67
- Displaying NAT46 information 68
- Clearing NAT46 information 69
- Access Control Lists 71
- Rule-based ACLs 72
- Default ACL action 74
- ACL IDs and entries 74
- Configuring rule-based ACLs 77
- Modifying rule-based ACLs 85
- Reordering ACLs 86
- Applying ACLs to interfaces 87
- Adding comments to named ACLs 89
- ACL logging 94
- Displaying ACL log entries 95
- Clearing the ACL statistics 97
- Throttling the fragment rate 98
- DRAFT: BROCADE CONFIDENTIAL 100
- Enabling strict TCP mode 101
- Enabling strict UDP mode 102
- ACLs and ICMP 103
- Numbered ACLs 104
- Named ACLs 105
- • Enable the strict TCP mode 107
- IPv6 Access Control Lists 109
- Configuration notes 110
- Processing of IPv6 ACLs 110
- Configuring IPv6 ACLs 111
- IPv6 ACL syntax 114
- Syntax Description 116
- Displaying IPv6 ACLs 118
- Logging IPv6 ACLs 119
- Network Address Translation 121
- Configuring NAT 122
- Configuring static NAT 123
- Configuring dynamic NAT 123
- Enabling IP NAT 124
- NAT configuration examples 125
- IP NAT with VIP overlap 129
- Translation timeouts 130
- Stateless static IP NAT 132
- IP NAT redundancy 133
- Displaying NAT information 144
- Displaying NAT translation 147
- Displaying VRRPE information 148
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