On the Windows command line, run the following commands:

  • netsh interface ipv6 set interface LAN weakhostreceive=enabled
  • netsh interface *ipv6 *set interface Kemp-SMTP-LOOPBACK weakhostreceive=enabled
  • netsh interface *ipv6 *set interface Kemp-SMTP-LOOPBACK weakhostsend=enabled

In the loopback adapter properties:

  • IPv6 address: <IPAddressOf TheVIP>
  • Subnet prefix length: 128

In Advanced Properties, set the Interface metric to 254.

Note: If you want IPv6 DSR, you must have the IPv6 address as the primary address on the interface. Additional addresses may be IPv6 or IPv4, as required.