Canon 802.11g 54M WLAN - Manual (Page 62)

802.11g 4-Port Wireless LAN Broadband Router
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3.3.8 Proxy DNS
Use the Proxy DNS screen to map a domain name to its server IP address. This
feature acts as a DNS server for the internal and DMZ networks, allowing you to
connect to local machines without using an external DNS server. This simplifies
network configuration and management.