Overriding a Bridge NAT Configuration

Use Bridge NAT to manage internet traffic originating at a remote site. In addition to traditional NAT functionality, Bridge NAT provides a means of configuring NAT for bridged traffic through an access point. NAT rules are applied to bridged traffic through the access point, and matching packets are NATed to the WAN link instead of being bridged on their way to the router.

Using Bridge NAT, a tunneled VLAN (extended VLAN) is created between the NoC and a remote location. When a remote client needs to access the internet, internet traffic is routed to the NoC, and from there routed to the internet. This increases the access time for the end user on the client.

To resolve latency issues, Bridge NAT identifies and segregates traffic heading towards the NoC and outwards towards the internet. Traffic towards the NoC is allowed over the secure tunnel. Traffic towards the internet is switched to a local WLAN link with access to the internet.

Note

Bridge NAT supports single AP deployments only. This feature cannot be used in a branch deployment with multiple access points.

To define a NAT configuration or override that can be applied to a profile:

1. Select Configuration > Devices > Device Overrides from the web UI.
2. Select Security.
3. Select Bridge NAT.
4. Refer to the following Bridge NAT settings to determine whether a new bridge NAT configuration needs to be created, or whether an existing one can be edited or deleted:

   Access List	Lists the ACL applying IP address access/deny permission rules to the Bridge NAT configuration.
   Interface	Lists the communication medium (outgoing layer 3 interface) between source and destination points. This is either the access point‘s pppoe1 or wwan1 interface or the VLAN used as the redirection interface between the source and destination.
   NAT Pool	Lists the names of existing NAT pools used with the bridge NAT configuration. This displays only when Overload Type is NAT Pool.
   Overload IP	Lists the IP address used to represent a large number of local addresses for this configuration.
   Overload Type	Lists the overload type used with the listed IP ACL rule. Select NAT Pool, One Global Address, or Interface IP Address.
   ACL Precedence	Lists the administrator-assigned priority set for the ACL. The lower the value listed, the higher the priority assigned to these ACL rules.

5. Click Add to create a new bridge VLAN configuration, Edit to modify or override an existing configuration, or Delete to permanently remove a configuration.
6. Select the ACL whose IP rules are applied to the policy based forwarding rule.
   You can define a new ACL by clicking the Create icon, or you can modify an existing set of IP ACL rules by clicking the Edit icon.
7. Use the spinner control to select the ACL Precedence.
   The lower the precedence value, the higher the priority assigned to this Dynamic NAT policy rule.
8. Use the IP Address Range table to configure IP addresses and address ranges that can used to access the internet.

   Interface	Select the outgoing Layer 3 interface on which traffic is redirected. The interface can be an access point wwan or pppoe interface. Traffic can also be redirected to a designated VLAN.
   NAT Pool	Displays the NAT pool used by this bridge NAT entry. A value is only displayed only when Overload Type has been set to NAT Pool.
   Overload IP	Lists the IP address used to represent a large number of local addresses for this configuration.
   Overload Type	Displays the override type for this policy-based forwarding rule.

9. Click + Add Row to set the interface, overload, and NAT pool settings for the bridge NAT configuration.
10. Click OK to save the changes made in the Add Row and Source Dynamic NAT screens.
    Click Reset to revert to the last saved configuration.