Configure NAT Prefixes

Learn how to configure local and global NAT prefixes.
A prefix is a group of one or more individual IP addresses or IP address subnets. Prefixes are a construct of NAT which help to identify traffic. They can be either global or local in scope. Global prefixes are used when traffic of interest across all sites in a network can be identified with the same set of prefixes. For example, facilities infrastructure or print services for an enterprise. Local prefixes are used when specific prefix values change by branch location. Use local prefixes to simplify creation and administration of rules. For example, a subset of IP addresses within a subnet.
  • Configure global NAT prefixes.
    1. Select
      Policies
      Stacked Policies
      NAT
      NAT Prefixes
      .
    2. Click
      Add Prefix
      , and then select
      Global
      from the drop-down list.
    3. On the
      Create Global Prefix
      screen, enter a name and description for the prefix.
    4. Enter an IP and subnet address.
      IP addresses within a prefix are defined by the subnet. For example, 10.1.1.0/24 defines the entire limit of 255 IPs in that subnet.
    5. Select
      NAT
      in the
      Create for policy Type(s)
      section to replicate the prefix for NAT policies.
      (Optional)
      You can create a copy of this prefix filter to be used in Path and QoS policies respectively by selecting the Path and QoS check boxes.
  • Configure local NAT prefixes.
    1. Select
      Policies
      Stacked Policies
      NAT
      NAT Prefixes
      .
    2. Click
      Add Prefix
      , and then select
      Local
      from the drop-down list.
    3. On the
      Create Local Prefix
      screen, enter a name and description for the prefix.
    4. Attach a site to the local prefix filter from the
      Choose a site
      drop-down.
      You must attach a local prefix filter to a site for the filter to work.
    5. Select
      NAT
      in the
      Create for policy Type(s)
      section to replicate the prefix for NAT policies.

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