Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 86
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74 ServerIron ADX NAT64 Configuration Guide
53-1002444-02
Modifying rule-based ACLs
5
DRAFT: BROCADE CONFIDENTIAL
Reordering ACLs
When you use the Foundry device’s CLI to configure any ACL, the software places the ACL entries in
the ACL in the order you enter them. For example, if you enter the following entries in the order
shown below, the software always applies the entries to traffic in the same order.
ServerIronADX(config)# access-list 1 deny 209.157.22.0/24
ServerIronADX(config)# access-list 1 permit 209.157.22.26
If a packet matches the first ACL entry in this ACL and is therefore denied, the software does not
compare the packet to the remaining ACL entries. In this example, packets from host
209.157.22.26 will always be dropped, even though packets from this host match the second
entry.
You can use the CLI to reorder entries within an ACL by individually removing the ACL entries and
then re-adding them. To use this method, enter the no operand followed by the command for an
ACL entry, and repeat this for each ACL entry in the ACL you want to edit. After removing all the ACL
entries from the ACL, re-add them.
This method works well for small ACLs such as the example above, but can be impractical for ACLs
containing many entries. Therefore, Foundry devices provide an alternative method. The alternative
method lets you upload an ACL list from a TFTP server and replace the ACLs in the device’s
running-config file with the uploaded list. Thus, to change an ACL, you can edit the ACL on the file
server, then upload the edited ACL to the device. You then can save the changed ACL to the
device’s startup-config file.
ACL lists contain only the ACL entries themselves, not the assignments of ACLs to interfaces. You
must assign the ACLs on the device itself.
NOTE
The only valid commands that are valid in the ACL list are the access-list and end commands. The
Foundry device ignores other commands in the file.
Use the following procedure to modify an ACL by configuring an ACL list on a file server.
1. Use a text editor to create a new text file. When you name the file, use 8.3 format (up to eight
characters in the name and up to three characters in the extension).
NOTE
Make sure the Foundry device has network access to the TFTP server.
2. Optionally, clear the ACL entries from the ACLs you are changing by placing commands such as
the following at the top of the file.
no access-list 1
no access-list 101
When you load the ACL list into the device, the software adds the ACL entries in the file after
any entries that already exist in the same ACLs. Thus, if you intend to entirely replace an ACL,
you must use the no access-list <num> command to clear the entries from the ACL before the
new ones are added.
3. Place the commands to create the ACL entries into the file. The order of the separate ACLs
does not matter, but the order of the entries within each ACL is important. The software applies
the entries in an ACL in the order they are listed within the ACL. Here is an example of some
ACL entries.
- 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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