This document has some AIX networking tips and commands.

• List all network interface cards on the AIX server :  The "lsdev" command displays devices in the system and their characteristics. Use the below command to just list the NIC.

bash-3.00# lsdev | grep -i ether | grep -i Available
en0        Available 03-08         Standard Ethernet Network Interface
bash-3.00#

• Check network interface speed and duplex settings :  "entstat" command shows the details of the interface.

bash-3.00# entstat -d ent0 | grep 'Media Speed Running:'
Media Speed Running: 100 Mbps Full Duplex
bash-3.00#

• Change network interface speed & duplex settings. : "chdev" command is used to change the device attributes.

bash-3.00# chdev -P -l ent0 -a media_speed=100_Full_Duplex
ent0 changed
bash-3.00#

• Setting IP address, netmask , routing for interface : The command "mktcpip" is used to set tcp-ip paramters to a network card. This command can also be launched using "smit".

The "mktcpip" command and options are as below (they are self-explanatory)

/usr/sbin/mktcpip
        -i NIC
        -h HOSTNAME
        -a HOST.IP
        -m HOST.IP.NETMASK
        -d DNS.DOMAIN.NAME   
        -g DEF.GATEWAY.IP
        -A ACTIVATE.NOW

Example :
bash-3.00#  /usr/sbin/mktcpip -h 'geekyAIX' -i 'en0' -a '192.170.1.2' -d 'geekyfacts.com' -g '192.170.1.1' -A 'yes'
bash-3.00#

And as usual "ifconfig -a" to see the IP address details of a interface.