Support for Proxy ARP in NSX-T Data Center
Article ID: 319020
Updated On: 03-24-2025
Products
VMware NSX
Issue/Introduction
This article provides information on VMware NSX-T support for Proxy ARP on the NSX-T Edge.
Environment
VMware NSX-T
Resolution
Proxy ARP is automatically enabled when a NAT rule or a load balancer VIP uses an IP address from the subnet of the Tier-0 gateway uplink.
Proxy ARP can be considered in environments where IP subnets are limited and where it is problematic to use new subnets easily and rapidly (either by using static routes or BGP).
For production environment, VMware recommends implementing proper routing between a physical fabric and the NSX-T Tier-0 by using either static routes or Border Gateway Protocol with BFD. If proper routing is used between the Tier-0 gateway and the physical fabric, BFD with its sub-second timers will converge faster.
The following table summarizes the design option and support for the Proxy ARP feature on the NSX-T Edge:
Proxy ARP can be considered in environments where IP subnets are limited and where it is problematic to use new subnets easily and rapidly (either by using static routes or BGP).
For production environment, VMware recommends implementing proper routing between a physical fabric and the NSX-T Tier-0 by using either static routes or Border Gateway Protocol with BFD. If proper routing is used between the Tier-0 gateway and the physical fabric, BFD with its sub-second timers will converge faster.
The following table summarizes the design option and support for the Proxy ARP feature on the NSX-T Edge:
| NSX-T Proxy ARP Support | |
| Tier-0 High Availability Mode | Support |
| Active / Standby | Supported |
| Active / Active | Supported starting in 3.2 |
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