Some cases it's just easier to re-setup DHCP using a script. This script will setup a DHCP connection on a Wired Ethernet device and configure a hostname of your liking. This script has only been developed for RedHat/Fedora tm based systems running Open Client layer.
 | NetworkManager and static IP SetupStatic IP address users should consider turning off Network Manager first (see info below) |
- Download the script by right clicking on the following link:
- Setup Network Script (click here)
(or click on the attachments link at the bottom the page)
- Setup Network Script (click here)
- Save the file to your Desktop (or some other accessible location):
- Open a terminal session by right clicking on Desktop and selecting Open Terminal (or locate the terminal icon from the menu)
- change directory to your Desktop (or wherever you downloaded the file) :
cd $HOME/Desktop
- Type to confirm it is there.
ls *network*
- type chmod a+x ./setup_network.sh
- run the command with: ./setup_network.sh
[quickm@chad scripts]$ ./setup_network.sh
+------------------------------------------------------------+
| |
| Configure DHCP IP Address on (eth0) ........... 1 |
| |
| Configure STATIC IP Address on (eth0) ........... 2 |
| |
| Change default device from (eth0) to ? ............ 3 |
| |
| Show current settings on (eth0) ................... 4 |
| |
| Quit ............................................. Q |
| |
+------------------------------------------------------------+
Choose 1 - Q - Select the number 1 and press the enter key to setup eth0,
if you are unsure which device, click on option 3 to see what is available on your system. - Input your full hostname (i.e. ILOVELINUX.fishkill.ibm.com), you can makeup any name you like but the domain (fishkill.ibm.com) should be site specific or use (ibm.com).
 | Testing:reboot the system or restart the network service. service network restart |
setup_network-1.sh:
#!/bin/bash
# ----------------------------------------------------------------#
# setup DHCP or static on REDHAT SYSTEMS ONLY
# ----------------------------------------------------------------#
# M QUICK v1.0b 2006/09
CMDLN_ARGS="$@" # Command line arguments for this script
export CMDLN_ARGS
empty_str=""
sleep_timer=5
USAGE="Usage: $0 [ static | dhcp ] [ ethX ]"
## GLOBAL IP VARIABLES
iface="eth0"
full_host=$empty_str
part_host=$empty_str
ipaddr=$empty_str
mask=$empty_str
gate=$empty_str
dns1=$empty_str
dns2=$empty_str
domain=$empty_str
sub_domain=$empty_str
# ----------------------------------------------------------------#
# Check for Root credentials
# ----------------------------------------------------------------#
# if passed silent option, will exit on failure.
chk_root () {
temp_cond="$1"
if [ ! $( id -u ) -eq 0 ]; then
if [ "$temp_cond" != "silent" ] ;then
echo "Please enter root's password."
exec su -c "${0} ${CMDLN_ARGS}" # Call this prog as root
# su -c \"$0 $@\" # another way to do it
exit ${?} # sice we're 'execing' above, we wont reach this exit
# unless something goes wrong.
else
# the 'silent' option has been set - just exit.
echo "root privilages have not been met ."
exit 1
fi
fi
}
# ----------------------------------------------------------------#
# Assign arguments to variables 'iface' and 'net_type'
# ----------------------------------------------------------------#
set_input_args(){
temp_val1="`echo $CMDLN_ARGS | awk '{print $1}'`"
temp_val2="`echo $CMDLN_ARGS | awk '{print $2}'`"
if [ `echo $temp_val1 | grep eth` ] ;then
iface=$temp_val1
net_type=$temp_val2
else
iface=$temp_val2
net_type=$temp_val1
fi
}
# ----------------------------------------------------------------#
# Check Passed in Values for correctness, quit on errors
# ----------------------------------------------------------------#
## confirm input values are correct, if not print usage mssg
check_input_args() {
set_input_args # acquire values passed to the script
# print warning if script is run on a non Red Hat system
if ! [ "`cat /etc/redhat-release | egrep 'Red|Hat'`" ] ;then
echo "WARNING: This script has only been tested on Red Hat based systems!"
sleep 3
fi
# print usage message if no values are passed (or fail to be assigned)
if [[ "$net_type" = "" || "$iface" = "" ]] ;then
echo "$USAGE"
exit 1;
fi
# print this if net_type isn't set correctly
if ! [[ "$net_type" = "static" || "$net_type" = "dhcp" ]] ;then
echo "Error: Invalid value ($net_type), either dhcp or static are valid ..."
echo "$USAGE"
exit 1;
fi
# print this if the interface is invalid
if ! [ "`echo $iface | grep eth`" ] ;then
echo "Error: Invalid interface ($iface), will not continue ..."
echo "$USAGE"
exit 1;
fi
# print this if the interface is not present on the system as a warning.
if ! [ "`/sbin/ifconfig | grep $iface`" ] ;then
echo "WARNING: $iface not found by ifconfig! "
sleep 2
fi
}
# ----------------------------------------------------------------#
# Check host name for validity
# ----------------------------------------------------------------#
isvalid_host() {
if [[ "`echo $1 | cut -d '.' -f1`" = "$empty_str" || "`echo $1 | cut -d '.' -f2`" = "$empty_str" || "`echo $1 | cut -d '.' -f3`" = "$empty_str" || "`echo $1 | cut -d '.' -f4`" = "$empty_str" ]] ;then
echo "invalid value [$1]"
exit 1
fi
if [ "$full_host" = "$part_host" ] ;then
echo "hostname error .. [ $full_host = $part_host ]"
exit 1
fi
}
# ----------------------------------------------------------------#
# Get Hostname and DSSO (global vars)
# ----------------------------------------------------------------#
# sets hostname values 'full_host' 'part_host' etc.
set_hostname_values() {
local full_host="$1"
part1="`echo $full_host | cut -d '.' -f1`"
part2="`echo $full_host | cut -d '.' -f2`"
part3="`echo $full_host | cut -d '.' -f3`"
part4="`echo $full_host | cut -d '.' -f4`"
if [[ "$part1" = "$empty_str" || "$part2" = "$empty_str" || "$part3" = "$empty_str" ]] ;then
echo "Error: Invalid hostname [ $full_host ] .."
exit 1
fi
part_host="$part1"
if [ "$part4" = "$empty_str" ] ;then
domain="$part2.$part3"
sub_domain="$part2.$part3"
else
domain="$part2.$part3.$part4"
sub_domain="$part3.$part4"
fi
}
# ----------------------------------------------------------------#
# Gather Enduser information on host/ip/etc.
# ----------------------------------------------------------------#
## Query user for ip info depending on static or dhcp choice
gather_ip_information() {
local net_type="$1"
if [ "$net_type" = "static" ] ;then
echo " * Static IP Address setup *"
echo " Please input the following information:"
echo " "
echo -e " Full Hostname of machine (xxxx.site.ibm.com):"
read full_host
set_hostname_values "$full_host"
echo -e " IP Address:"
read ipaddr
isvalid_host "$ipaddr"
echo -e " subnet mask:"
read mask
isvalid_host "$mask"
echo -e " Gateway:"
read gate
isvalid_host "$gate"
echo -e " DNS server 1:"
read dns1
isvalid_host "$dns1"
echo -e " DNS server 2:"
read dns2
isvalid_host "$dns2"
else
echo " * DHCP IP Address setup *"
echo " Please input the following information:"
echo " "
local confirm="NULL"
local x=0
echo "A default hostname is required :" ;sleep 2
while ! [ "$confirm" = "$full_host" ] ;do
if [ $x -gt 0 ] ;then
echo "Error, your values did not match, please try again .."
fi
echo " => Please input a FULL hostname for your system (i.e. host.fishkill.ibm.com ):"
read full_host
echo " => Please (re)input your desired full hostname (again):"
read confirm
(( x += 1 ))
done
set_hostname_values "$full_host"
fi
}
# ----------------------------------------------------------------#
# Setup DHCP Config files
# ----------------------------------------------------------------#
# Set the RH config files to DHCP
switch_to_dhcp(){
echo "Setting up /etc/hosts .. "
echo "127.0.0.1 localhost.localdomain localhost" > /etc/hosts
echo "127.0.0.1 $full_host $part_host" >> /etc/hosts
sleep 2
echo "Setting up /etc/sysconfig/network-scripts/ifcfg-$iface .."
echo "DEVICE=$iface" > /etc/sysconfig/network-scripts/ifcfg-$iface
echo "BOOTPROTO=dhcp" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "ONBOOT=yes" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "TYPE=Ethernet" >>/etc/sysconfig/network-scripts/ifcfg-$iface
sleep 2
echo "Setting up /etc/sysconfig/network .."
echo "HOSTNAME=$full_host" > /etc/sysconfig/network
echo "NETWORKING=yes" >> /etc/sysconfig/network
sleep 2
echo "Setting up /etc/resolv.conf .."
sleep 2
}
# ----------------------------------------------------------------#
# Setup STATIC Config files
# ----------------------------------------------------------------#
## set the RH config files to Static
switch_to_static(){
echo "Setting up /etc/hosts .. "
echo "127.0.0.1 localhost.localdomain localhost" > /etc/hosts
echo "$ipaddr $full_host $part_host" >> /etc/hosts
sleep 2
echo "Setting up /etc/sysconfig/network-scripts/ifcfg-$iface .."
echo "DEVICE=$iface" > /etc/sysconfig/network-scripts/ifcfg-$iface
echo "BOOTPROTO=static" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "IPADDR=$ipaddr" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "NETMASK=$mask" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "GATEWAY=$gate" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "HOSTNAME=$full_host" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "ONBOOT=yes" >>/etc/sysconfig/network-scripts/ifcfg-$iface
echo "TYPE=Ethernet" >>/etc/sysconfig/network-scripts/ifcfg-$iface
sleep 2
echo "Setting up /etc/sysconfig/network .."
echo "HOSTNAME=$full_host" > /etc/sysconfig/network
echo "NETWORKING=yes" >> /etc/sysconfig/network
echo "GATEWAY=$gate" >> /etc/sysconfig/network
echo "NETWORKDELAY=10" >> /etc/sysconfig/network
sleep 2
echo "Setting up /etc/resolv.conf .."
echo "search $domain $sub_domain " > /etc/resolv.conf
echo "nameserver $dns1" >> /etc/resolv.conf
echo "nameserver $dns2" >> /etc/resolv.conf
sleep 2
}
# ----------------------------------------------------------------#
# ADD IBM DHCP QIP Information
# ----------------------------------------------------------------#
## IBM DHCP QIP addtion to "network" file
add_IBM_qip_settings() {
local quote=$'\042'
local dollar=`echo -e "\044"`
local one="1"
#local dollar_one="$dollar$one"
echo "# IBM QIP SETTINGS (added by $0 script)" >> /etc/sysconfig/network
echo "if [ -x /opt/ibm/c4eb/bin/valid-qip-hostname ]; then" >> /etc/sysconfig/network
echo " #" >> /etc/sysconfig/network
echo " # Ensure hostnames like 'localhost' or 'loopback' are not used." >> /etc/sysconfig/network
echo " #" >> /etc/sysconfig/network
echo -e " /opt/ibm/c4eb/bin/valid-qip-hostname \042\044HOSTNAME\042" >> /etc/sysconfig/network
echo "fi" >> /etc/sysconfig/network
echo -e "if [ \044? -eq 0 ]; then" >> /etc/sysconfig/network
echo " # hostname is OK, so propogate to DNS" >> /etc/sysconfig/network
echo -e " DHCP_HOSTNAME=\042\044HOSTNAME\042" >> /etc/sysconfig/network
echo "fi" >> /etc/sysconfig/network
echo "# also the following will cause dhclient to append ibm.com to domain" >> /etc/sysconfig/network
echo -e "new_domain_name=\042\044{new_domain_name} ibm.com\042" >> /etc/sysconfig/network
echo "# ifup will brink up wireless device" >> /etc/sysconfig/network
echo "check_link_down()" >> /etc/sysconfig/network
echo "{" >> /etc/sysconfig/network
echo -e " if ! LC_ALL=C iwconfig $dollar$one 2>&1 | grep -q \042no wireless extensions\042; then" >> /etc/sysconfig/network
echo " return 1" >> /etc/sysconfig/network
echo " fi" >> /etc/sysconfig/network
echo " if [ -x /sbin/mii-tool -o -x /sbin/ethtool ]; then" >> /etc/sysconfig/network
echo -e " if ! LC_ALL=C ip link show dev $dollar$one 2>/dev/null| grep -q UP ; then" >> /etc/sysconfig/network
echo -e " ip link set dev $dollar$one up >/dev/null 2>&1" >> /etc/sysconfig/network
echo " fi" >> /etc/sysconfig/network
echo " timeout=0" >> /etc/sysconfig/network
echo -e " while [ \044timeout -le 10 ]; do" >> /etc/sysconfig/network
echo -e " check_mii_tool $dollar$one" >> /etc/sysconfig/network
echo -e " m=\044?" >> /etc/sysconfig/network
echo -e " check_ethtool $dollar$one" >> /etc/sysconfig/network
echo -e " e=\044?" >> /etc/sysconfig/network
echo -e " if [ \044m -eq 1 ] || [ \044e -eq 1 ] ; then" >> /etc/sysconfig/network
echo " return 1" >> /etc/sysconfig/network
echo " fi" >> /etc/sysconfig/network
echo -e " if [ \044m -eq 2 ] && [ \044e -eq 2 ] ; then" >> /etc/sysconfig/network
echo " return 1" >> /etc/sysconfig/network
echo " fi" >> /etc/sysconfig/network
echo " usleep 500000" >> /etc/sysconfig/network
echo -e " timeout=\044((timeout+1))" >> /etc/sysconfig/network
echo " done" >> /etc/sysconfig/network
echo " return 0" >> /etc/sysconfig/network
echo " fi" >> /etc/sysconfig/network
echo " return 1" >> /etc/sysconfig/network
echo "}" >> /etc/sysconfig/network
}
# ----------------------------------------------------------------#
# Print Values Compiled
# ----------------------------------------------------------------#
print_input_variables(){
echo " Network type: $net_type"
echo " Interface: $iface"
echo " Full Host: $full_host"
echo " Part Host: $part_host"
echo " IP address: $ipaddr"
echo " Net Mask: $mask"
echo " Gateway: $gate"
echo " DNS: $dns1 $dns2"
echo " Domain: $domain $sub_domain"
}
# ----------------------------------------------------------------#
# Menu for Main function
# ----------------------------------------------------------------#
menu(){
printf " +------------------------------------------------------------+\n"
printf " | |\n"
printf " | Configure DHCP IP Address on ($iface) ........... 1 |\n"
printf " | |\n"
printf " | Configure STATIC IP Address on ($iface) ........... 2 |\n"
printf " | |\n"
printf " | Change default device from ($iface) to ? ............ 3 |\n"
printf " | |\n"
printf " | Show current settings on ($iface) ................... 4 |\n"
printf " | |\n"
printf " | Quit ............................................. Q |\n"
printf " | |\n"
printf " +------------------------------------------------------------+\n"
echo " Choose 1 - Q "
}
# ----------------------------------------------------------------#
# Netowrk Main function
# ----------------------------------------------------------------#
setup_network() {
#check_input_args # check arguments
#chk_root
gather_ip_information "$net_type" # query user for ip info
print_input_variables # print data
echo " Continuing in $sleep_timer seconds, press cntrl + C to stop ... "
sleep $sleep_timer
# set hostname now (not necessary)
hostname $full_host
# switch to static or dhcp functions
if [[ "$net_type" = "static" ]] ;then
switch_to_static
else
switch_to_dhcp
fi
add_IBM_qip_settings #add IBM qip lines to "network" file
echo " Finished ... (restart network settings)"
}
show_status() {
temp="`ifconfig $iface | grep inet | awk '{print $2}' | cut -d: -f 2| cut -d. -f 1,2`"
echo " ------------------------------ "
echo " ip addr: `ifconfig $iface | grep inet | awk '{print $2}' | cut -d: -f 2`"
temp="`ifconfig $iface | grep inet | awk '{print $2}' | cut -d: -f 2 | cut -d. -f 1,2`"
echo " route: `route | grep $temp | awk '{print $1}'`"
echo " gate: `ifconfig $iface | grep inet | awk '{print $4}' | cut -d: -f 2`"
echo " MAC: `ip link show $iface | grep ff:ff | awk '{print $2}'`"
echo " device: `/sbin/mii-tool $iface`"
echo " ------------------------------ "
}
change_iface(){
set -a iface_list
x=1
echo "Available Devices On System:"
echo "-----------------------------------"
for each in `/sbin/ifconfig | grep Link | grep -v lo | grep -v vmnet | awk '{print $1}'` ;do
iface_list[$x]=$each
echo " $x ..................... ${iface_list[$x] }"
(( x+=1 ))
done
echo " Q ..................... QUIT"
echo " Select an avaiable device: 1 - X "
read -e choice
if [ "$choice" = "q" ] || [ "$choice" = "Q" ] ;then
echo "nothing selected ..."
else
echo "Setting device to ${iface_list[$choice]} ..."
iface=${iface_list[$choice]}
fi
}
network_manager(){
# input for this script is on or off.. ie network_manager on
input=$1
if [ "$input" = "off" ] || [ "$input" = "OFF" ] ;then
echo "turning off NetworkManager, you will lose the desktop applet ..";sleep 2
/sbin/service NetworkManager stop
/sbin/chkconfig --level 35 NetworkManager off
echo "to turn back on -> /sbin/service NetworkManager start;/sbin/chkconfig --level 35 NetworkManager on"
elif [ "$input" = "on" ] || [ "$input" = "ON" ] ;then
echo "turning on NetworkManager, you will be overridden with the desktop applet ..";sleep 2
/sbin/service NetworkManager start
/sbin/chkconfig --level 35 NetworkManager on
echo "finished ... run script again for static to turn off .. "
else
echo "No action was taken with network_manager ... ";sleep 2
fi
}
# ----------------------------------------------------------------#
# MAIN
# ----------------------------------------------------------------#
if [ ! $( id -u ) -eq 0 ]; then
echo " $HOSTNAME "
chk_root # check for root
fi
while [ 1 ] ;do
menu
read choice
case $choice in
1)
net_type="dhcp"
setup_network
network_manager "on"
;;
2)
net_type="static"
setup_network
network_manager "off"
;;
3) change_iface ;sleep 1
;;
4) show_status
sleep 4
;;
*) echo "Quitting application ..."
exit 1
;;
esac
done
# ----------------------------------------------------------------#
# ----------------------------------------------------------------#
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