The configuration of both IPv4 and IPv6 DNS servers in Cisco IOS software still uses the ip name-server [address] global configuration command. This same command has now been modified to allow the DNS server IP address to be specified as either an IPv4 or an IPv6 address. The following example illustrates how to configure a router to use both an IPv4 and an IPv6 DNS server:
R1(config)#ip name-server ?A.B.C.D Domain server IP address (maximum of 6)
X:X:X:X::X Domain server IP address (maximum of 6)
R1(config)#ip name-server . . .
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