DHCP Server Configuration

and in here you have a dhcd example fir 2 subnetting


ddns-update-style interim;
ignore client-updates;

allow booting;
allow bootp;

subnet 172.16.0.0 netmask 255.255.255.0 {
}
subnet 172.32.0.0 netmask 255.255.255.0 {

# --- default gateway
      option routers                  172.32.0.1;
      option subnet-mask            255.255.0.0;

      option nis-domain            "pxe.net";
      option domain-name            "pxe.net";
      option domain-name-servers      172.16.0.1;

      # PXE-specific configuration directives
      next-server 172.32.0.1;
      filename "pxelinux.0";

      option time-offset            -21600;      # Central Standard Time
      option ntp-servers            172.16.0.5;
#      option netbios-name-servers      192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
#      option netbios-node-type 2;

      range dynamic-bootp 172.32.0.128 172.32.0.255;
      default-lease-time 21600;
      max-lease-time 43200;

      # we want the nameserver to appear at a fixed address
      host ns {
            next-server marvin.redhat.com;
            hardware ethernet 12:34:56:78:AB:CD;
            fixed-address 207.175.42.254;
      }
}

with both of those examples I am still getting the errors

No subnet declaration for eth1 (10.0.0.18).
** Ignoring requests on eth1.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface eth1 is attached. **
 
 
Not configured to listen on any interfaces!

Wat should the submast be? Do I need to setup the nic cards to listen or something?

no. please show us the result of ifconfig -a

here's what I need to use from ifconfig

eth1      Link encap:Ethernet  HWaddr 00:09:5B:62:E8:65
          inet addr:10.0.0.18  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2052 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2270 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1951828 (1.8 Mb)  TX bytes:351771 (343.5 Kb)
          Interrupt:10 Base address:0xc000
 
eth2      Link encap:Ethernet  HWaddr 00:10:5A:9E:15:EF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:76 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:19314 (18.8 Kb)  TX bytes:5310 (5.1 Kb)
          Interrupt:5 Base address:0xe800

ok try this script to initialize dhcp you have an error in the script.  if you run in console mode work no ??? dhcpd eth1 if working replace your initial scritp for this in /etc/init.d/dhcpd

[root@omega docs]# cat /etc/init.d/dhcpd



#!/bin/sh
#
# dhcpd         This shell script takes care of starting and stopping
#               dhcpd.
#
# chkconfig: - 65 35
# description: dhcpd provide access to Dynamic Host Control Protocol.

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network
. /etc/sysconfig/dhcpd

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

[ -f /usr/sbin/dhcpd ] || exit 0
[ -f /etc/dhcpd.conf ] || exit 0
[ -f /var/lib/dhcp/dhcpd.leases ] || exit 0

RETVAL=0
prog="dhcpd"

start() {
        # Start daemons.
        echo -n $"Starting $prog: "
#       daemon /usr/sbin/dhcpd ${DHCPDARGS}
daemon /usr/sbin/dhcpd eth1
        RETVAL=$?
        echo
        [ $RETVAL -eq 0 ] && touch /var/lock/subsys/dhcpd
        return $RETVAL
}

stop() {
        # Stop daemons.
        echo -n $"Shutting down $prog: "
        killproc dhcpd
        RETVAL=$?
        echo
        [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/dhcpd
        return $RETVAL
}

# See how we were called.
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart|reload)
        stop
        start
        RETVAL=$?
        ;;
  condrestart)
        if [ -f /var/lock/subsys/dhcpd ]; then
            stop
            start
            RETVAL=$?
        fi
        ;;
  status)
        status dhcpd
        RETVAL=$?
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart|condrestart|status}"
        exit 1
esac

exit $RETVAL

if you change /etc/init.d/dhcpd   the line

daemon /usr/sbin/dhcpd eth0

for

daemon /usr/sbin/dhcpd eth1


is working.

ok it says daemon /usr/sbin/dhcpd eth1 now but I still get the same errors.

Should it say eth2 because that is the nic that connects to the switch for the network. eth1 is the nic that connects the dsl modem.

OK. this is the problem you need to assign a static ip address to eth2.

ifconfig eth2 10.0.0.19

ok I've done everything you've mentioned but I still get the same errrors.

No subnet declaration for eth1 (10.0.0.18).
** Ignoring requests on eth1.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface eth1 is attached. **
 
 
Not configured to listen on any interfaces!


I'm pretty lost

ok. first....

the dhcp server is eth2 ok

you put in the main script /etc/init.d/dhcpd eth2



eth1 dont exist for dhcp

change all for eth2

Still the same exact errors

if you put

/usr/sbin/dhcpd eth2 -cf /etc/dhcpd.conf

what is the result?

[root@localhost root]# /usr/sbin/dhcpd eth2 -cf /etc/dhcpd.conf
Internet Software Consortium DHCP Server V3.0pl2
Copyright 1995-2003 Internet Software Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP
Wrote 0 leases to leases file.
 
No subnet declaration for eth2 (0.0.0.0).
** Ignoring requests on eth2.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface eth2 is attached. **
 
 
Not configured to listen on any interfaces!
 
If you did not get this software from ftp.isc.org, please
get the latest from ftp.isc.org and install that before
requesting help.
 
If you did get this software from ftp.isc.org and have not
yet read the README, please read it before requesting help.
If you intend to request help from the dhcp-server@isc.org
mailing list, please read the section on the README about
submitting bug reports and requests for help.
 
Please do not under any circumstances send requests for
help directly to the authors of this software - please
send them to the appropriate mailing list as described in
the README file.
 
exiting.
[root@localhost root]#

ok. you dont have ip addres in eth2 check that with ifconfig -a

[root@localhost root]# ifconfig -a
eth1      Link encap:Ethernet  HWaddr 00:09:5B:62:E8:65
          inet addr:10.0.0.18  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5601 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5564 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4755874 (4.5 Mb)  TX bytes:986236 (963.1 Kb)
          Interrupt:10 Base address:0xc000
 
eth2      Link encap:Ethernet  HWaddr 00:10:5A:9E:15:EF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:158 errors:0 dropped:0 overruns:0 frame:0
          TX packets:176 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:42837 (41.8 Kb)  TX bytes:33039 (32.2 Kb)
          Interrupt:5 Base address:0xe800
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:13501 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13501 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:10095979 (9.6 Mb)  TX bytes:10095979 (9.6 Mb)
 
[root@localhost root]#

I've assigned a static IP I thought using netconfig but I guess it didnt take it or something.

ok. try to assign  a ip address. with neat netconfig or ifconfig

ifconfig eth2 10.0.0.20  netmask 255.255.255.0

ok great... it took the ip address... but I still have the same issues.  = \

if you try this ??

 /usr/sbin/dhcpd eth2 -cf /etc/dhcpd.conf


paste the error

[root@localhost root]#  /usr/sbin/dhcpd eth2 -cf /etc/dhcpd.conf
Internet Software Consortium DHCP Server V3.0pl2
Copyright 1995-2003 Internet Software Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP
Wrote 0 leases to leases file.
 
No subnet declaration for eth2 (10.0.0.20).
** Ignoring requests on eth2.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface eth2 is attached. **
 
 
Not configured to listen on any interfaces!
 
If you did not get this software from ftp.isc.org, please
get the latest from ftp.isc.org and install that before
requesting help.
 
If you did get this software from ftp.isc.org and have not
yet read the README, please read it before requesting help.
If you intend to request help from the dhcp-server@isc.org
mailing list, please read the section on the README about
submitting bug reports and requests for help.
 
Please do not under any circumstances send requests for
help directly to the authors of this software - please
send them to the appropriate mailing list as described in
the README file.
 
exiting.
[root@localhost root]#




Im also using the dhcp.conf as



cat dhcpd.conf
ddns-update-style ad-hoc;
#ddns-update-style interim;
authoritative;
 
subnet 10.0.0.0 netmask 255.255.255.0 {
        option routers                  10.0.0.18;
        option subnet-mask              255.255.255.0;
 
        option domain-name              "yourserver.net";
        option domain-name-servers       10.0.0.18;
 
        option time-offset              -03000;     # Eastern Standard Time
 
default-lease-time 600;
max-lease-time 7200;
 
        range 10.0.0.21 10.0.0.250;
}
 

nop im sorry but all i see ok!

eth2 with ip number

dhcpd.conf correct
dhcpd daemon ok.

last question..  when you run dhcpd in console what say /var/log/messages ????? please paste

Jun 23 12:53:59 localhost dhcpd: Internet Software Consortium DHCP Server V3.0pl2
Jun 23 12:53:59 localhost dhcpd: Copyright 1995-2003 Internet Software Consortium.
Jun 23 12:53:59 localhost dhcpd: All rights reserved.
Jun 23 12:53:59 localhost dhcpd: For info, please visit http://www.isc.org/products/DHCP
Jun 23 12:53:59 localhost dhcpd: Wrote 0 leases to leases file.
Jun 23 12:53:59 localhost dhcpd:
Jun 23 12:53:59 localhost dhcpd: No subnet declaration for eth2 (10.0.0.20).
Jun 23 12:53:59 localhost dhcpd: ** Ignoring requests on eth2.  If this is not what
Jun 23 12:53:59 localhost dhcpd:    you want, please write a subnet declaration
Jun 23 12:53:59 localhost dhcpd:    in your dhcpd.conf file for the network segment
Jun 23 12:53:59 localhost dhcpd:    to which interface eth2 is attached. **
Jun 23 12:53:59 localhost dhcpd:
Jun 23 12:53:59 localhost dhcpd:
Jun 23 12:53:59 localhost dhcpd: Not configured to listen on any interfaces!
Jun 23 12:53:59 localhost dhcpd:
Jun 23 12:53:59 localhost dhcpd: If you did not get this software from ftp.isc.org, please
Jun 23 12:53:59 localhost dhcpd: get the latest from ftp.isc.org and install that before
Jun 23 12:53:59 localhost dhcpd: requesting help.
Jun 23 12:53:59 localhost dhcpd:
Jun 23 12:53:59 localhost dhcpd: If you did get this software from ftp.isc.org and have not
Jun 23 12:53:59 localhost dhcpd: yet read the README, please read it before requesting help.
Jun 23 12:53:59 localhost dhcpd: If you intend to request help from the dhcp-server@isc.org
Jun 23 12:53:59 localhost dhcpd: mailing list, please read the section on the README about
Jun 23 12:54:00 localhost dhcpd: submitting bug reports and requests for help.
Jun 23 12:54:00 localhost dhcpd:
Jun 23 12:54:00 localhost dhcpd: Please do not under any circumstances send requests for
Jun 23 12:54:00 localhost dhcpd: help directly to the authors of this software - please
Jun 23 12:54:00 localhost dhcpd: send them to the appropriate mailing list as described in
Jun 23 12:54:00 localhost dhcpd: the README file.
Jun 23 12:54:00 localhost dhcpd:
Jun 23 12:54:00 localhost dhcpd: exiting.
Jun 23 12:56:20 localhost dhcpd: Internet Software Consortium DHCP Server V3.0pl2
Jun 23 12:56:20 localhost dhcpd: Copyright 1995-2003 Internet Software Consortium.
Jun 23 12:56:20 localhost dhcpd: All rights reserved.
Jun 23 12:56:20 localhost dhcpd: For info, please visit http://www.isc.org/products/DHCP
Jun 23 12:56:20 localhost dhcpd: Wrote 0 leases to leases file.
Jun 23 12:56:20 localhost dhcpd:
Jun 23 12:56:20 localhost dhcpd: No subnet declaration for eth2 (10.0.0.20).
Jun 23 12:56:20 localhost dhcpd: ** Ignoring requests on eth2.  If this is not what
Jun 23 12:56:20 localhost dhcpd:    you want, please write a subnet declaration
Jun 23 12:56:20 localhost dhcpd:    in your dhcpd.conf file for the network segment
Jun 23 12:56:20 localhost dhcpd:    to which interface eth2 is attached. **
Jun 23 12:56:20 localhost dhcpd:
Jun 23 12:56:20 localhost dhcpd:
Jun 23 12:56:20 localhost dhcpd: Not configured to listen on any interfaces!
Jun 23 12:56:20 localhost dhcpd:
Jun 23 12:56:20 localhost dhcpd: If you did not get this software from ftp.isc.org, please
Jun 23 12:56:20 localhost dhcpd: get the latest from ftp.isc.org and install that before
Jun 23 12:56:20 localhost dhcpd: requesting help.
Jun 23 12:56:20 localhost dhcpd:
Jun 23 12:56:20 localhost dhcpd: If you did get this software from ftp.isc.org and have not
Jun 23 12:56:20 localhost dhcpd: yet read the README, please read it before requesting help.
Jun 23 12:56:20 localhost dhcpd: If you intend to request help from the dhcp-server@isc.org
Jun 23 12:56:20 localhost dhcpd: mailing list, please read the section on the README about
Jun 23 12:56:20 localhost dhcpd: submitting bug reports and requests for help.
Jun 23 12:56:20 localhost dhcpd:
Jun 23 12:56:20 localhost dhcpd: Please do not under any circumstances send requests for
Jun 23 12:56:20 localhost dhcpd: help directly to the authors of this software - please
Jun 23 12:56:20 localhost dhcpd: send them to the appropriate mailing list as described in
Jun 23 12:56:20 localhost dhcpd: the README file.
Jun 23 12:56:21 localhost dhcpd:
Jun 23 12:56:21 localhost dhcpd: exiting.
Jun 23 12:56:26 localhost nmbd[2094]: [2004/06/23 12:56:26, 0] nmbd/nmbd_become_lmb.c:become_local_master_stage2(396)
Jun 23 12:56:26 localhost nmbd[2094]:   *****
Jun 23 12:56:26 localhost nmbd[2094]:
Jun 23 12:56:26 localhost nmbd[2094]:   Samba name server ROCKYROAD is now a local master browser for workgroup SERVER on subnet 10.0.0.20
Jun 23 12:56:26 localhost nmbd[2094]:
Jun 23 12:56:26 localhost nmbd[2094]:   *****
Jun 23 12:57:02 localhost dhcpd: Internet Software Consortium DHCP Server V3.0pl2
Jun 23 12:57:02 localhost dhcpd: Copyright 1995-2003 Internet Software Consortium.
Jun 23 12:57:02 localhost dhcpd: All rights reserved.
Jun 23 12:57:02 localhost dhcpd: For info, please visit http://www.isc.org/products/DHCP
Jun 23 12:57:02 localhost dhcpd: Wrote 0 leases to leases file.
Jun 23 12:57:02 localhost dhcpd:
Jun 23 12:57:02 localhost dhcpd: No subnet declaration for eth2 (10.0.0.20).
Jun 23 12:57:02 localhost dhcpd: ** Ignoring requests on eth2.  If this is not what
Jun 23 12:57:02 localhost dhcpd:    you want, please write a subnet declaration
Jun 23 12:57:02 localhost dhcpd:    in your dhcpd.conf file for the network segment
Jun 23 12:57:02 localhost dhcpd:    to which interface eth2 is attached. **
Jun 23 12:57:02 localhost dhcpd:
Jun 23 12:57:02 localhost dhcpd:
Jun 23 12:57:02 localhost dhcpd: Not configured to listen on any interfaces!
Jun 23 12:57:02 localhost dhcpd:
Jun 23 12:57:02 localhost dhcpd: If you did not get this software from ftp.isc.org, please
Jun 23 12:57:02 localhost dhcpd: get the latest from ftp.isc.org and install that before
Jun 23 12:57:02 localhost dhcpd: requesting help.
Jun 23 12:57:02 localhost dhcpd:
Jun 23 12:57:02 localhost dhcpd: If you did get this software from ftp.isc.org and have not
Jun 23 12:57:02 localhost dhcpd: yet read the README, please read it before requesting help.
Jun 23 12:57:02 localhost dhcpd: If you intend to request help from the dhcp-server@isc.org
Jun 23 12:57:03 localhost dhcpd: mailing list, please read the section on the README about
Jun 23 12:57:03 localhost dhcpd: submitting bug reports and requests for help.
Jun 23 12:57:03 localhost dhcpd:
Jun 23 12:57:03 localhost dhcpd: Please do not under any circumstances send requests for
Jun 23 12:57:03 localhost dhcpd: help directly to the authors of this software - please
Jun 23 12:57:03 localhost dhcpd: send them to the appropriate mailing list as described in
Jun 23 12:57:03 localhost dhcpd: the README file.
Jun 23 12:57:03 localhost dhcpd:
Jun 23 12:57:03 localhost dhcpd: exiting.

its all ok. please check again the file /etc/dhcpd.conf is the last options........ delete it and create again. with this. and check if eth2 dont lose de ip


put this in your /etc/dhcpd.conf


ddns-update-style ad-hoc;
ignore client-updates;
authoritative;
subnet 10.0.0.0 netmask 255.255.255.0 {
        option routers                  10.0.0.18;
        option subnet-mask              255.255.255.0;
        option domain-name              "localhost";
        option domain-name-servers       10.0.0.18;
        option time-offset              -03000;     # Eastern Standard Time
default-lease-time 600;
max-lease-time 7200;        
}

Hi wgordy

Normally, routers expect to have different IP subnets at the xDSL side (your eth1) and the DHCP side (your eth2). Perhaps it's possible to do it in the way you want, but it could confuse the whole system to have a part of the subnet 10.0.0.x at each side of your DHCP server.

Try a more classic way:

1. Give 10.0.0.18 as static IP address to eth1 (with ifconfig or redhat-config-network);
2. Give 192.168.1.18 as static IP address to eth2 (idem);
3. Configure dhcp to listen to eth2 and set dhcpd.conf to
######################################################
ddns-update-style ad-hoc;
#ddns-update-style interim;
authoritative;

subnet 192.168.1.0 netmask 255.255.255.0 {
        option routers                  192.168.1.18;
        option subnet-mask              255.255.255.0;

        option domain-name              "yourserver.net";
        option domain-name-servers       192.168.1.18;

        option time-offset              -03000;     # Eastern Standard Time

default-lease-time 600;
max-lease-time 7200;

        range 192.168.1.19 192.168.1.254;
}
######################################################
like pablouruguay said in one of his first comments, but changing every 10.0.0.x by 192.168.1.x

4. Be sure your DHCP server also acts as a name server,  otherwise the line "option domain-name-servers       192.168.1.18;" will be useless. Check the gateway of the eth1 side is set to something usefull, like the IP address of the modem (10.0.0.138 v.gr.). No gateway must be set at the eth2 side, but the DHCP server must provide 192.168.1.18 to its clients ("option router" in the dhcpd.conf file)

Good luck.

OK great... now I everything has an IP address... but on those computers I can't ping anything outside of the local network. What should I change?

I'm trying this but I'm not getting anywhere

up route add -net 10.0.0.18 netmask 255.255.255.0 dev eth1

not really sure what to do

you need to apply iptables for make a NAT outside....  what is the Ips. for eth0 / eth1 / eth2 ??

in here you hace a tutorial for that

http://www.linuxforum.com/linux_tutorials/5/1.php

or


http://www.linuxquestions.org/questions/showthread.php?threadid=192893

or

http://www.linuxquestions.org/questions/history/186000


thats all.

and any comments ??? you can make dhcp work?

If you can't ping through the dhcp server, it is possible that you don't have IP forwarding enabled. You can do this by setting net.ipv4.ip_forward = 1 (instead of = 0) in your /etc/sysctl.conf file and reboot. You can achieve the same by echoing a "1" to some pseudo-file of the /proc filesystem, but since I don't remenber which one, you faster get results by changing /etc/sysctl.conf and rebooting (argh!).

By the way, when you say "now I everything has an IP address", does it mean your DHCP server successfully gives an IP-address to all the computers of your LAN? It would be great. Tell me please.

hey wgordi. so ?????


work all ok ?! ?

can you close this question please?

Hi,
I am having the same problem...but the solution above doesn't seem to work for me. I am running Suse Pro 9.1 with Samba 3.0.2a.

I only have 1 ethernet interface (can't recall if its eth0 or eth1): 192.168.1.1

Sorry, that's about all the info I can give you now, my ddns service provider is down, I can't vnc into my server.

My dhcpd.conf:
#
default-lease-time 600;
max-lease-time 7200;
#
ddns-update-style none;
ddns-updates off;
#
option domain-name "dhcp.suse.local";
option domain-name-servers 213.45.56.1, 213.65.87.11;
option broadcast-address 192.168.1.255;
option routers 192.168.1.254;
option subnet-mask 255.255.255.0;
#
subnet 192.168.1.0 255.255.255.0
{
range 192.168.1.100 192.168.1.150;
}
#

Error msg:
"Wrote 0 lease to lease file.

No subnet declaration for eth-id-00:20:ed (0.0.0.0)
**Ignoring request on eth-id-00:20:ed. If this is not what you want,
please write a subnet declaration in your dhcpd.conf file for the network
segment to which interface eth-id-00:20:ed is attached. **

Not configured to listen on any interfaces!"

Please advise

This problem happened to me and I figured out that my network interface was down!

The ad-hoc mode is absolete, so I don't understand how that solution did it? May be the user has enabled his eth0 mistakenly without noticing.