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10/16/2001 I wrote this page several years ago when Red Hat and Linux were version 6.X. See addendum at the end for a user contribution that contains information that is more up to date.
Recent versions of Linux install pump as the dhcp client. Many people have had problems with pump. This document tells you how to install the dhcpcd client program in place of pump.
You should be logged in as root for the entire procedure.
First, stop pump from running:
| ifdown eth0 | (Assuming that 'eth0' is the network device that is connected to the cable modem.) |
Then install the dhcpcd program from your Red Hat or Mandrake CD.
Insert the CD. Mount it, if needed. (mount /mnt/cdrom). Change to /mnt/cdrom/RedHat/RPMS. Find the exact name of the dhcpcd rpm file. (ls *dhcpcd*.rpm) Then type "rpm -Uvh dhdpcd_filename.rpm" to install it. Change back to the hard drive. (cd /) and unmount the CD. (umount /mnt/cdrom.)
Then, you must create the directory /etc/dhcpc, because dhcpcd uses this directory, but doesn't create it when dhcpcd is installed. (mkdir /etc/dhcpc)
Next, you must edit /etc/sysconfig/network-scripts/ifup. Search for the reference to pump.
if [ -n "$PUMP" ]; then
echo -n "Determining IP information for $DEVICE..."
if /sbin/pump -i $DEVICE ; then
echo " done."
Change it to
if [ -n "$PUMP" ]; then
echo -n "Determining IP information for $DEVICE..."
# if /sbin/pump -i $DEVICE ; then
if /sbin/dhcpcd $DEVICE ; then
echo " done."
(Don't forget to "comment out" the line that starts pump!)
I had seen references to phrase the dhcpcd line like this:
if /sbin/dhcpcd $DEVICE -h $HOSTNAME ; then
When I did, then dhcpcd failed on bootup. Apparently, the -h $HOSTNAME clause is needed in some cable modem systems, but flat out doesn't work at all on my system. You can try it either way. Use the version that works.
You also must modify /etc/sysconfig/network-scripts/ifdown. This step is often not mentioned in a lot of postings about dhcpcd. Look for
if [ "$BOOTPROTO" = bootp -o "$BOOTPROTO" = dhcp ]; then
pump -r -i ${DEVICE}
and change it to
if [ "$BOOTPROTO" = bootp -o "$BOOTPROTO" = dhcp ]; then
# pump -r -i ${DEVICE}
/sbin/dhcpcd $DEVICE -k
You can test this now by typing
ifup eth0
It should give a civilized display and not complain about failing. Then try to bring it down.
ifdown eth0
And back up again
ifup eth0
Check to see if it has been configured properly. Type ifconfig and see what is displayed for eth0. Then try ping yahoo.com to see if your connection works. (Ctrl-C to exit ping.)
Then try re-booting and see if eth0 initializes OK.
Look at /etc/dhcpc/dhcpcd-eth0.info This will list all the network parameters that dhcpcd set. (IP address, DNS server, lease time, etc.)
I have also noted some misinformation about resolv.conf. Older versions of dhcpcd created resolv.conf in /etc/dhcpc and required a symbolic link to make it appear in /etc. The version of dhcpcd that comes with RH 6 creates /etc/resolv.conf directly.
Optional. You might want to change the default logfile where syslog sends DHCP messages to. (By default it goes to /var/log/messages.) To do this, edit your /etc/syslog.conf file and add this to it:
# Log dhcpcd operations local0.* /var/log/dhcpcd.log
Remember to use tabs and NOT spaces in your syslog.conf file. Otherwise it won't work.
The system will now log DHCP messages to both /var/log/messages as well as to /var/log/dhcpcd.log, so now you have to tell it not to log DHCP messages to /var/log/messages. To do this, add ;local0.none to your /var/log/messages line. It should look something like this:
# Log anything (except mail) of level info or higher. # Don't log private authentication messages! *.info;mail.none;authpriv.none;local0.none /var/log/messages
For the changes to take effect, you'll need to restart the syslog daemon. To do so, just do a
killall -HUP syslogd
That will force syslogd to re-read its config file for the changes to take effect.
See man syslog.conf -S 5 for more information.
Syslog information courtesy of Bruce A. Buhler
Joe Kidd (cassiusdrow@yahoo.com) contributed:
Wayne,
On your "Using dhcpcd instead of pump" page you give
some instructions that are no longer necessary for
RedHat 7.1. The new ipup and ifdown scripts already
include the code for dhcpcd along side the code for
pump. All that is required is to confirm that the
file /sbin/dhcpcd exists (dhcpcd is installed), and
to delete or rename the file /sbin/pump. The new
scripts will automatically fall back to dhcpcd.
I wrote a little script that should be run as root to automate the
process. It looks like this:
#!/bin/bash
#
# Switch from pump to dhcpcd
if [ -x /sbin/dhcpcd ] && [ -x /sbin/pump ];
then
echo -n Switching from pump to dhcpcd...
ifdown eth0
chmod 644 /sbin/pump
ifup eth0
echo DONE.
fi
It makes sure that both dhcpcd & pump are executable, and then brings down
eth0, removes the executable flag from pump, then brings eth0 back up. The
ifup/ifdown scripts will automatically use dhcpcd.
That's all there is to it
Thanks Joe.
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