Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 102
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90 ServerIron ADX NAT64 Configuration Guide
53-1002444-02
Enabling strict TCP or UDP mode for flow-based ACLs
5
DRAFT: BROCADE CONFIDENTIAL
To disable the strict ACL mode and return to the default ACL behavior, enter the following
command.
ServerIronADX(config)# no ip strict-acl-tcp
NOTE
Enter the ip rebind-acl command at the global CONFIG level of the CLI to place the ip strict-acl-tcp or
no ip strict-acl-tcp command into effect.
Enabling strict UDP mode
By default, when you use ACLs to filter UDP traffic, the Foundry device does not compare all UDP
packets against the ACLs. Instead, the device compares the source and destination information
against entries in the session table. The session table contains forwarding entries based on Layer
3 and Layer 4 information:
• If the session table contains a matching entry, the device forwards the packet, assuming that
the first packet the device received that contains the same address information was permitted
by the ACLs.
• If the session table does not contain a matching entry, the device sends the packet to the CPU,
where the software compares the packet against the ACLs. If the ACLs permit the packet
(explicitly by a permit ACL entry or implicitly by the absence of a deny ACL entry), the CPU
creates a session table entry for the packet’s forwarding information and forwards the packet.
For tighter control, the software provides the strict ACL UDP mode. When you enable strict UDP
processing, the device sends every UDP packet to the CPU and compares the packet against the
configured ACLs.
NOTE
If the device's configuration currently has ACLs associated with interfaces, remove the ACLs from the
interfaces before changing the ACL mode.
To enable the strict ACL UDP mode, enter the following command at the global CONFIG level of the
CLI.
ServerIronADX(config)# ip strict-acl-udp
Syntax: [no] ip strict-acl-udp
This command configures the device to compare all UDP packets against the configured ACLs
before forwarding them.
To disable the strict ACL mode and return to the default ACL behavior, enter the following
command.
ServerIronADX(config)# no ip strict-acl-udp
NOTE
Enter the ip rebind-acl command at the global CONFIG level of the CLI to place the ip strict-acl-udp
or no ip strict-acl-udp command into effect.
Configuring ACL packet and flow counters
You can configure counters for packets and flows that match entries in an ACL. Using the CLI, you
can display the contents of the counters and clear them:
- 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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