Shell script change ip

[slax2009]

Hi

I have trouble with this script. I try to change ip (network/interfaces)


# An example ethernet card setup: (broadcast and gateway are optional)
#
# auto eth0
# iface eth0 inet static
# address 192.168.1.25
# network 192.168.1.0
# netmask 255.255.255.0
# broadcast 192.168.1.255
# gateway 192.168.1.1


#!/bin/sh
echo "Configure your network interfaces"
echo "Please enter your old IP address: (eg 192.168.1.25)"
read NIC_OLD_IP
echo "Enter new IP address:"
read NIC_NEW_IP
echo "Please enter your old gateway address: (eg 192.168.1.1)"
read NIC_OLD_GATE
echo "Enter new gateway address:"
read NIC_NEW_GATE
echo "Please enter your old network address: (eg 192.168.1.0)"
read NIC_OLD_NET
echo "Enter new network address:"
read NIC_NEW_NET
echo "Please enter your old broadcast address: (eg 192.168.1.255)"
read NIC_OLD_BROADCAST
echo "Enter new network address:"
read NIC_NEW_BROADCAST



#
echo
echo Is this information correct? [Y/N] Default is [Y]
read ANS
case $ANS in
YES|[Yy]es|[Yy]|"")
echo OK, we will continue...
;;
NO|[Nn]o|[Nn])
echo Lets start over...
sleep 3;clear;./ipchange;exit
;;
*)
esac
#
cp -p /etc/network/interfaces /etc/network/interfaces.orig
sed -e s/${NIC_OLD_IP}/${NIC_NEW_IP}/g /etc/network/interfaces
sed -e s/${NIC_OLD_GATE}/${NIC_NEW_GATE}/g /etc/network/interfaces
sed -e s/${NIC_OLD_NET}/${NIC_NEW_NET}/g /etc/network/interfaces
sed -e s/${NIC_OLD_BROADCAST}/${NIC_NEW_BROADCAST}/g /etc/network/interfaces



#
sleep 2
echo
echo Done....
fi
host#
Is there other way to just enter (NIC_NEW_IP), and will auto enter the gateway, broadcast and network address.

Like just enter: 192.168.1.25, and it assign to $xxx

adresss 192.168.1.25
network xxx.xxx.xxx.0
broadcast xxx.xxx.xxx.255
gateway xxx.xxx.xxx.1

where $xxx is 192.168.1

Thanks in advanced

[lavinog]

NIC_IP_PREFIX=$(echo "$NIC_NEW_IP"|cut -d '.' -f 1-3)
NIC_NEW_GATE="${NIC_IP_PREFIX}.1"
NIC_NEW_NET="${NIC_IP_PREFIX}.0"
NIC_NEW_BROADCAST="${NIC_IP_PREFIX}.255"

[slakkie]

NIC_IP_PREFIX=$(echo "$NIC_NEW_IP"|cut -d '.' -f 1-3)
NIC_NEW_GATE="${NIC_IP_PREFIX}.1"
NIC_NEW_NET="${NIC_IP_PREFIX}.0"
NIC_NEW_BROADCAST="${NIC_IP_PREFIX}.255"


Yes, that works only for /24 networks. What if I have a /28?

Perhaps use ipcalc to determine the network/broadcast/gateway address:

sudo aptitude install ipcalc

ipcalc 192.168.0.0/28

and parse that output?