D-Link DFL-260E User Manual page 164

4.2.6. Proxy ARP
Proxy ARP and High Availability Clusters
In HA clusters, switch routes cannot be used and transparent mode is therefore not an option.
However, proxy ARP does function with HA and is consequently the only way to implement
transparent mode functionality with a cluster.
Automatically Added Routes
Proxy ARP cannot be enabled for automatically added routes. For example, the routes that
NetDefendOS creates at initial startup for physical interfaces are automatically added routes. The
reason why Proxy ARP cannot be enabled for these routes is because automatically created routes
have a special status in the NetDefendOS configuration and are treated differently.
If Proxy ARP is required on an automatically created route, the route should first be deleted and
then manually recreated as a new route. Proxy ARP can then be enabled on the new route.
Not all interfaces can make use of Proxy ARP
It is only possible to have Proxy ARP functioning for Ethernet and VLAN interfaces.
Proxy ARP is not relevant for other types of NetDefendOS interfaces since ARP is not
involved.
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Chapter 4. Routing