Local ND Proxy
Local ND proxy allows communication between hosts in different VLANs with identical
subnet masks or hosts that are part of private or an isolated VLAN.
Local ND proxy can be used to enable ND proxy on specific interfaces in a router. In the example, host 1 and host 2 are on the same IPv6 subnet. However, host 1 resides in VLAN 10 and host 2 resides in VLAN 20. Host 1 sends a neighbor solicitation request directly to host 2 because they are on the same IPv6 subnet. Because host 1 and host 2 are on different VLANs, host 2 will not receive this neighbor solicitation request. Local ND proxy must be enabled on interface 3 of router A to forward messages between host 1 and host 2. The generation of the proxy neighbor advertisement packet works as explained in IPv6 ND Proxy.