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Enabling the IPv6 DNS Proxy/Relay Function
Context
IPv6 DNS relay is similar to IPv6 DNS proxy. The IPv6 DNS proxy searches for DNS entries saved in the domain name cache after receiving IPv6 DNS query packets from IPv6 DNS clients. The IPv6 DNS relay, however, directly forwards IPv6 DNS query packets to the DNS server, reducing the cache usage.
When the device functions as the DNS proxy/relay, pay attention to the following:
- To use an IPv4 DNS server, you must enable the IPv4 DNS proxy/relay function.
- To use an IPv6 DNS server, you must enable the IPv6 DNS proxy/relay function.
- If both IPv4 DNS proxy/relay and IPv6 DNS proxy/relay functions are enabled, both IPv4 and IPv6 DNS servers can be used. After receiving a DNS request packet, the device preferentially selects an IPv4 or IPv6 DNS server based on the DNS query type. For example, after receiving a Class A query request, the device preferentially selects an IPv4 DNS server. If the query of all IPv4 DNS servers times out or no IPv4 DNS server is configured, the device sends the query packet to an IPv6 DNS server.