6.4. DNS Proxy Implementation

6.4. DNS Proxy Implementation

The CLAT should implement a DNS proxy as defined in [RFC5625]. The case of an IPv4-only node behind the CLAT querying an IPv4 DNS server is undesirable since it requires both stateful and stateless translation for each DNS lookup. The CLAT should set itself as the DNS server via DHCP or other means and should proxy DNS queries for IPv4 and IPv6 LAN clients. Using the CLAT-enabled home router or UE as a DNS proxy is a normal consumer gateway function and simplifies the traffic flow so that only IPv6 native queries are made across the access network. DNS queries from the client that are not sent to the DNS proxy on the CLAT must be allowed and are translated and forwarded just like any other IP traffic.