Users Guide

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 enable the DHCP for DNS address feature and specify the static preferred and alternate DNS server

addresses, type:

racadm config -g cfgLanNetworking -o

cfgDNSServersFromDHCP 1

To enable 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 1

Setting Static DNS IP addresses

NOTE: The static DNS IP addresses settings are not valid unless the DCHP for DNS address feature is

disabled.

For IPv4, to set the preferred primary and secondary DNS IP server addresses, type:

racadm config -g cfgLanNetworking -o cfgDNSServer1 <IP-address>

racadm config -g cfgLanNetworking -o cfgDNSServer2 <IPv4-address>

For IPv6, to set the preferred and secondary DNS IP Server addresses, type:

racadm config -g cfgIPv6LanNetworking -o

cfgIPv6DNSServer1 <IPv6-address>

racadm config -g cfgIPv6LanNetworking -o

cfgIPv6DNSServer2 <IPv6-address>

Viewing and Modifying CMC Network LAN Settings

The LAN settings, such as community string and SMTP server IP address, affect both the CMC and the

external settings of the chassis.

When IPv6 is enabled at boot time, three router solicitations are sent after every four seconds. If external

network switches are running the Spanning Tree Protocol (STP), the external switch ports may be blocked

for more than 12 seconds in which the IPv6 router solicitations are sent. In such cases, there may be a

period when IPv6 connectivity is limited, until router advertisements are gratuitously sent by the IPv6

routers.

NOTE: Changing the CMC network settings may disconnect your current network connection.

NOTE: You must have Chassis Configuration Administrator privilege to set up CMC network

settings.