ARP Tab

Configuration > Networking > Routing > ARP

NOTE: In Orchestrator 9.6.0 and later, this tab is labeled ARP. In earlier versions of the React-based Orchestrator UI, this tab was labeled Neighbors.

Starting in Orchestrator 9.7.0, the ARP tab provides centralized visibility into ARP and neighbor tables for EdgeConnect appliances. This visibility improves network monitoring and simplifies troubleshooting of Layer 2 and Layer 3 connectivity. From the ARP tab, you can view ARP entries, add static entries, and delete existing entries. These operations previously required the local appliance CLI.

The ARP tab displays a consolidated view of all Layer 2 ARP entries known to selected EdgeConnect appliances, including entries for management interfaces (mgmt0 and mgmt1). The table displays the same information as the EdgeConnect CLI command show neighbor. You can select one or more appliances in the appliance tree to view their ARP entries in a single table.

NOTE: The ARP tab includes a shortcut link to the DHCP Manager tab, but the two are separate features. ARP entries are managed independently from their own location under Configuration > Networking > Routing > ARP.

NOTE: The ARP tab is available only in the React-based Orchestrator UI. It is not available in the local Appliance Manager. There is no corresponding Monitoring > ARP view; all ARP management functions are accessed from Configuration > Networking > Routing > ARP.

NOTE: The ARP tab requires EdgeConnect OS 9.6.0.0 or later. When an appliance running an earlier version is selected, the Add button is disabled and displays the tooltip “Appliance version does not support.”

ARP, Routes, and VRFs

Address Resolution Protocol (ARP) resolves Layer 3 IP addresses to Layer 2 MAC addresses for hosts on directly connected subnets. EdgeConnect appliances maintain per-interface ARP tables to support routing decisions.

Key relationships between ARP, routes, and VRFs:

  • Each VRF maintains its own routing and ARP tables.
  • Routes resolve their next hops through ARP. If the ARP entry for a next hop IP address is missing or stale, traffic through that next hop may fail.
  • ARP entries are automatically refreshed when traffic is exchanged with a neighbor. Administrators can manually clear entries to force re-resolution.

ARP Table Columns

The following columns appear in the ARP table.

Column Description
Appliance Name of the EdgeConnect appliance.
IP address Layer 3 IP address of the neighbor. Both IPv4 and IPv6 addresses are shown.
MAC address Layer 2 MAC address associated with the IP address.
Interface index Numeric index of the local interface on which the ARP entry was learned.
Interface name Name of the local interface (for example, wan0, lan0, mgmt0, or mgmt1).
Type Type of ARP entry. Dynamic or Static.

The equivalent CLI command is show neighbor. Use show neighbor ipv4 or show neighbor ipv6 to filter by address family.

NOTE: EdgeConnect supports up to 2,000 static ARP entries per appliance. This limit applies only to static entries; it does not limit the number of dynamically learned entries shown in the table. Use the inline search to filter by IP address, MAC address, or interface name.

NOTE: When adding a static ARP entry, enter the MAC address in colon-separated format, for example 00:11:22:33:44:55.

NOTE: The ARP table includes entries for management interfaces (mgmt0 and mgmt1). A MAC address may appear multiple times in the table—for example, when mgmt0 is connected to the same subnet as a data path interface. This can be useful for verifying Layer 2 connectivity between management and data path networks.

Adding a Static ARP Entry

Use the Add button to create a new static ARP entry for the selected appliance.

NOTE: The Add button is available only when exactly one appliance is selected. If multiple appliances are selected, the Add button is disabled and displays the tooltip “Select only one appliance.”

To add a static ARP entry:

  1. Navigate to Configuration > Networking > Routing > ARP.
  2. Select a single appliance.
  3. Click Add.

  4. In the ARP Configuration dialog box, complete the following fields.

    Field Description
    Interface name Local interface to associate with this entry. Select from the drop-down menu. Required.
    IP address IP address of the neighbor. Required.
    MAC address MAC address to associate with the IP address. Required. Enter the address in colon-separated format, for example 00:11:22:33:44:55.
  5. Select Save.

Deleting ARP Entries

You can delete an individual ARP entry or clear all dynamic ARP entries at once.

Complete the following steps to delete a specific ARP entry.

  1. Navigate to Configuration > Networking > Routing > ARP.
  2. Select the appliance whose ARP entry you want to delete.
  3. In the ARP table, locate the row to remove and select the corresponding delete icon (X) in the last column.
  4. In the Delete ARP confirmation dialog box, review the message “Are you sure you want to delete the selected ARP?” and select Delete.

To clear all dynamic ARP entries:

  1. Navigate to Configuration > Networking > Routing > ARP.
  2. Select one or more appliances.
  3. Select Clear all dynamic types.
  4. In the confirmation dialog box, review the warning “Deleting dynamic types will cause a network outage. Are you sure you want to delete them?”
  5. Select Delete.

CAUTION: Clearing all dynamic types removes all dynamically learned ARP entries (both IPv4 and IPv6) for the selected appliances, causing a temporary network disruption while the appliances relearn the entries. Static ARP entries are not affected.