Getting DHCP to use resolv.conf?

[fbsd]

I got this from the ISC-dhcp questions list.

Note: This might not work, Not tested, No guarantees.
Use this as starter code and after testing post what
you get working for the list archives.

In dhcpd.conf comment out the line "option domain-name-servers"
and add following line

  include "/etc/dhcpd.name-servers";

This will include the contents of the named file into dhcpd.conf.
It is easier to manipulate a small separate file containing only
a single line, rather than trying to manage the whole
dhcpd.conf file

Every time dhcp-client runs it will try to run
/etc/dhclient-exit-hooks file if it exists.

Create a empty /etc/dhclient-exit-hooks file and populate with this

###############  Start of refresh dhcpd dns ip  ####################
# This script will propagate to dhcpd the changed dns servers ip
address
# which dhcp-client puts in resolv.conf.
#
# In dhcpd.conf replace the "option domain-name-servers" line with
this
#
#  include "/etc/dhcpd.name-servers";
#
# Spript uses the dhcpc variables to build temp line in dhcpd
format.
# Then compare temp content to production content.
# If different replace production content with new content from
temp,
# and restart dhcp to reread dhcpd.conf containing new ISP dns ip
addresses.
#
# logging event and sending email to user root is optional.
#
# Note: All LAN machines using dhcpd will not get new ISP dns ip
addresses
# until they reboot or their lease comes up for renewal.
#
# Each of the following lines must be one long line. IE: no wrap
arounds
####################################################################
####

# load my_domain_name_servers variable with ISP dns ip addresses
from dhcpc
my_domain_name_servers=`echo $new_domain_name_servers | sed -e 's/
/, /g'`

# Create single line in file to be included in dhcpd.conf
echo "option domain-name-servers $my_domain_name_servers ;" >
/etc/dhcpd.name-servers.tmp

# See if different from what production file contains
cmp -s /etc/dhcpd.name-servers.tmp /etc/dhcpd.name-servers
if [ $? -gt 0 ]; then
  # move the new file into place
  mv /etc/dhcpd.name-servers.tmp /etc/dhcpd.name-servers
  # restart dhcp using whatever is appropriate for your platform
  #service dhcpd restart
  /usr/local/etc/rc.d/isc-dhcpd.sh restart -q
  # Write message to log to document event.
  logger -t dhclient ISP DNS IP address changed to $new_ip_address
  # Send notification email to root user. This can wrap to next
line.
  mail -s "dhcp client changed ISP DNS IP addresses" root The
dhclient-exit-hooks script was invoked and has determined that your
ISP changed the IP address of their DNS servers. The new values have
been auto updated to dhcpd.conf and dhcpd restarted so they are now
in effect.

Note: All LAN machines using dhcpd will not start using the new ISP
dns ip addresses until they reboot or their lease comes up for
renewal.
fi

rm -f /etc/dhcpd.name-servers.tmp

###############  End of refresh dhcpd dns ip  ####################




-----Original Message-----
From: owner-freebsd-questions at freebsd.org
[mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Telting
Sent: Wednesday, April 26, 2006 3:40 PM
To: freebsd-questions at freebsd.org
Subject: Getting DHCP to use resolv.conf?


I would like to know how I can propagate the dns servers which the
dhcp
client puts in resolv.conf to dhcpd.  I only see how I can only
explicitly list a domain server with "option domain-name-servers".
How
do I propogate non static dns servers?

Chris

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