DNS proxy working mechanism on the USG6000

The working process of DNS proxy is as follows:
1.The DNS client sends a request packet to the DNS proxy. The DNS proxy IP address is the destination address of the request packet.
2.After receiving the request packet, the DNS proxy searches for DNS entries saved in the local domain name resolution tables.
?If mapping information exists, the DNS proxy sends a reply packet carrying the resolution result to the DNS client.
?If no mapping information exists, the DNS proxy sends the request packet to the DNS server for resolution.
3.After receiving the reply packet from the DNS server, the DNS proxy records the resolution result and forwards the reply packet to the DNS client.

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