No subnet declaration for eth0

jakobsg · 09-03-2006, 05:33 PM

My dhcp3-server is acting strangely (in my oppinion). I can't start the service, and when I look in the daemin.log afterwards I can see the following reported problem:

#tail /var/log/daemon.log

Code:

Sep  4 00:29:17 ltsp1 dhcpd: No subnet declaration for eth0 (192.168.50.1).
Sep  4 00:29:17 ltsp1 dhcpd: ** Ignoring requests on eth0.  If this is not what
Sep  4 00:29:17 ltsp1 dhcpd:    you want, please write a subnet declaration
Sep  4 00:29:17 ltsp1 dhcpd:    in your dhcpd.conf file for the network segment
Sep  4 00:29:17 ltsp1 dhcpd:    to which interface eth0 is attached. **
Sep  4 00:29:17 ltsp1 dhcpd:
Sep  4 00:29:17 ltsp1 dhcpd:
Sep  4 00:29:17 ltsp1 dhcpd: Not configured to listen on any interfaces!

I have seen meny post this error but the solutions I have found don't seem to match my problem. It tells me "No subnet declaration for eth0 (192.168.50.1)" but that's not true:

#ifconfig eth0

Code:

eth0      Link encap:Ethernet  HWaddr 00:0D:88:64:A2:32
          inet addr:192.168.50.1  Bcast:192.168.50.255  Mask:255.255.255.0
          inet6 addr: fe80::20d:88ff:fe64:a232/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:670 (670.0 b)
          Interrupt:193

Ubuntu dhcpd interface control file:
#cat /etc/default/dhcp3-server

Code:

INTERFACES="eth0"

#cat /etc/dhcp3/dhcpd.conf

Code:

ddns-update-style none;
option domain-name "";
get-lease-hostnames true;
#option domain-name-servers mainserver.skolesys.local;
log-facility local7;
subnet 192.168.50.0 netmask 255.255.255.0 {
  range 192.168.50.50 192.168.50.254;
  option routers 192.168.50.1;
  default-lease-time 604800;
  max-lease-time 605800;
  filename "pxelinux.0";
  option root-path "192.168.50.1:/opt/ltsp/i386";
}

Can anybody see a problem anywhare?

Best regards Jakob

camh · 09-03-2006, 06:21 PM

Try adding the line

Code:

DHCPDARGS=eth0;

to the top of dhcpd.conf and see if it works.

jakobsg · 09-03-2006, 06:26 PM

Quote:

Originally Posted by camh

Try adding the line

Code:

DHCPDARGS=eth0;

to the top of dhcpd.conf and see if it works.

No that didn't work

camh · 09-03-2006, 06:31 PM

What happens when you try specifying it on the command line? eg. dhcpd -cf /path/to/dhcpd.conf eth0

jakobsg · 09-03-2006, 11:53 PM

Quote:

Originally Posted by camh

What happens when you try specifying it on the command line? eg. dhcpd -cf /path/to/dhcpd.conf eth0

It says exactly the same. What's wrong with this configuration or is it dhcp3-server?..

Code:

Internet Systems Consortium DHCP Server V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.

No subnet declaration for eth1 (10.1.0.50).
** 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. **

Listening on LPF/eth0/00:0d:88:64:a2:32/192.168.50/24
Sending on   LPF/eth0/00:0d:88:64:a2:32/192.168.50/24
Sending on   Socket/fallback/fallback-net

camh · 09-04-2006, 01:19 AM

It looks like it's working now. It should be listening on eth0 (change the command line to match the interface you want).

jakobsg · 09-04-2006, 11:52 AM

I finally solved the problem. It looks like an ubuntu/debian issue/feature

I had just installed ltsp from the universe repository which installs a dhcpd.conf in /etc/ltsp. I realized this by having a look at the init.d script that starts the dhcp service: (snippet)

Code:

# Allow ltsp to override
if [ -f /etc/ltsp/dhcpd.conf ]; then
       CONFIG_FILE=/etc/ltsp/dhcpd.conf
       break
fi

So watch out debian/ubuntu users.

Best regards Jakob