Based on your description, it appears you have accidentially configured DHCP. You can verify this by viewing the file /etc/rc.net
Look for the line (shown below). If the value is USE_DHCP="0" then DHCP has been disabled. If the value is USE_DHCP="1", then DHCP has been enabled.
USE_DHCP="0"
The smitty interface for DHCP will not allow you to remove the configuration information once it is configured, so you must disable DHCP from the smitty "other available services" menu. The fast path can be accessed by typing:
smitty otherserv
and selecting the "dhcpcd subsystem" submenu. Select "stop using the dhcpcd subsystem" and select "Both".
Some of the other dhcp subsystems may also be configured to start. To check if they are started, type:
lssrc -a | grep dhcp
You should see this :
dhcpcd tcpip inoperative
dhcpsd tcpip inoperative
dhcprd tcpip inoperative
If any of the subsystems report active, they will need to be deactivated.
The commands bellow will deactivate the remaining dhcp subsystems.
/usr/sbin/chrctcp -S -d dhcpsd
/usr/sbin/chrctcp -S -d dhcprd
At this point, the server should be reconfigured for tcpip and restarted.
This article was published in the 21 May 1997 "Information Alley".