Users Guide

NOTE: Some DNS servers only register names of 31 characters or fewer. Make sure the designated name is within

the DNS required limit.

NOTE: The following settings are valid only if you have registered the CMC on the DNS server by setting

cfgDNSRegisterRac to 1.

• CMC Name — By default, the CMC name on the DNS server is cmc-<service tag>. To change the CMC name on the DNS

server, type:

racadm config -g cfgLanNetworking -o cfgDNSRacName <name>

where <name> is a string of up to 63 alphanumeric characters and hyphens. For example: cmc-1, d-345.

NOTE: If a DNS Domain name is not specified then the maximum number of characters is 63. If a domain name is

specified then the number of characters in CMC name plus the number of characters in the DNS Domain Name must

be less than or equal to 63 characters.

• DNS Domain Name — The default DNS domain name is a single blank character. To set a DNS domain name, type:

racadm config -g cfgLanNetworking -o

cfgDNSDomainName <name>

where <name> is a string of up to 254 alphanumeric characters and hyphens. For example: p45, a-tz-1, r-id-001.

Configuring Auto Negotiation, Duplex Mode, and Network Speed (IPv4 and IPv6)

When enabled, the auto negotiation feature determines whether the CMC automatically sets the duplex mode and network speed

by communicating with the nearest router or switch. Auto negotiation is enabled by default.

You can disable auto negotiation and specify the duplex mode and network speed by typing:

racadm config -g cfgNetTuning -o cfgNetTuningNicAutoneg 0

racadm config -g cfgNetTuning -o cfgNetTuningNicFullDuplex <duplex mode>

where:

<duplex mode> is 0 (half duplex) or 1 (full duplex, default)

racadm config -g cfgNetTuning -o cfgNetTuningNicSpeed <speed>

where:

<speed> is 10 or 100 (default).

Setting the Maximum Transmission Unit (MTU) (IPv4 and IPv6)

The MTU property allows you to set a limit for the largest packet that can be passed through the interface. To set the MTU, type:

racadm config -g cfgNetTuning -o cfgNetTuningMtu <mtu>

where <mtu> is a value between 576–1500 (inclusive; default is 1500).

NOTE: IPv6 requires a minimum MTU of 1280. If IPv6 is enabled, and cfgNetTuningMtu is set to a lower value, the

CMC uses an MTU of 1280.

Configuring CMC Network and Login Security Settings

The IP address blocking and User blocking features in CMC allow you to prevent security issues due to password guessing

attempts. This feature enables you to block a range of IP addresses and users who can access CMC. By deafult, the IP address

blocking feature is enabled in CMC.

NOTE: Blocking by IP address is applicable only for IPV4 addresses.

You can set the IP range attributes using CMC Web interface or RACADM. To use the IP address blocking and user blocking

features, enable the options using CMC web interface or RACADM. Configure the login lockout policy settings to enable you to set

the number of unsuccessful login attempts for a specific user or for an IP address. After exceeding this limit, the blocked user can