Canon LBP7100Cn User Manual page 252

Address]
IMPORTANT
Addresses that cannot be entered in [IP Address] and [Default Router Address]
Addresses that begin with "ff" (multicast address)
"::1" (loopback address)
5
Specify DHCPv6.
Proceed to Step 6 when not using DHCPv6.
[Use DHCPv6]
6
Specify the DNS.
Proceed to Step 7 when not using DNS.
To use DHCPv6, select the check box.