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Dell Chassis Management Controller Version 3.10 for Dell EMC PowerEdge VRTX User's Guide

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Enabling or Disabling DHCP for DNS IP Addresses

By default, the CMC’s DHCP for DNS address feature is disabled. When enabled, this feature obtains the primary and secondary DNS server addresses from the DHCP server. While using this feature, you do not have to configure static DNS server IP addresses.
To disable the DHCP for DNS address feature and specify the static preferred and alternate DNS server addresses, type: 
racadm config -g cfgLanNetworking -o
                                    cfgDNSServersFromDHCP 0
To disable the DHCP for DNS address feature for IPv6 and specify the static preferred and alternate DNS server addresses, type: 
racadm config -g cfgIPv6LanNetworking -o
                                    cfgIPv6DNSServersFromDHCP6 0

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