This script sets up a RHEL(-like) host's ipmi interface with a static address based on eth0's ip address. It uses 'cut' because our eth0 ip addresses are all the same length. It requires ipmitool to be installed. We get it via the 'OpenIPMI' package.

ipmi_from_eth0

#!/bin/bash
eth0addr=$(/sbin/ip addr show eth0 | /bin/awk '/inet/{gsub("/.+","");print $2}')
ipone=$(/bin/echo $eth0addr | /bin/cut -c1-9)
iptwo=$(/bin/echo $eth0addr | /bin/cut -c11-12)
ipnet=$(/bin/echo $eth0addr | /bin/cut -c1-5)

/usr/bin/ipmitool lan set 1 ipsrc static && \
/usr/bin/ipmitool lan set 1 ipaddr ${ipone}.2${iptwo} && \
/usr/bin/ipmitool lan set 1 defgw ipaddr ${ipnet}.0.1 && \
/usr/bin/ipmitool lan set 1 netmask 255.255.0.0 && \
/usr/bin/ipmitool user set password 2 PASSWORD_GOES_HERE && \
/bin/touch /root/.ipmisetupdone