DHCP cannot start (it fails No subnet declaration)

[marisdembovskis]

HI.
Want to setup DHCP for Nic eth1 (192.168.2.201).
From eth1 will be cable to dhcp network (7 clients).
In the same time, I have another Nic eth0 (192.168.1.201), where internet cable comes to server. (I have disable this to get working eth1 first)

so my problem is that, I can not start Dhcp!

[root@localhost ~]# service dhcpd restart
Shutting down dhcpd: [FAILED]
Starting dhcpd: [FAILED]

My configuration is:
1. [root@localhost ~]# ifconfig
eth1 Link encap:Ethernet HWaddr 00:14:85:34:5C:AF
inet addr:192.168.2.201 Bcast:192.168.2.255 Mask:255.255.255.0

2. [root@localhost ~]# dhcpd -d
No subnet declaration for eth1 (192.168.2.201).
** 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!

3. [root@localhost ~]# vi /etc/sysconfig/dhcpd
# Command line options here
DHCPDARGS=eth1

4. ----/etc/dhcpd.conf ----------
# dhcpd.conf

ddns-update-style ad-hoc;

option subnet-mask 255.255.255.0;
option broadcast-address 192.168.2.201;
option routers 192.168.2.201;
option domain-name-servers 192.168.2.201;
option domain-name "your_domain.org"; # You really should fix this
option option-128 code 128 = string;
option option-129 code 129 = text;


get-lease-hostnames true;

next-server 192.168.2.201;
option root-path "192.168.2.201:/opt/ltsp/i386";

subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.100 192.168.0.199;
if substring (option vendor-class-identifier, 0, 9) = "PXEClient" {
filename "/lts/2.6.16.1-ltsp-1/pxelinux.0";
}
else{
filename "/lts/vmlinuz-2.6.16.1-ltsp-1";
}
}

----end-of-------/etc/dhcpd.conf ----------




what to do?
Am I doing something wrong?
thanks.

[marisdembovskis]

any ideas?

[marisdembovskis]

Ok. I found solution.
I plugged 2 cables in. one was Static internet cable, second was LTSP network cable. And I changed a lot /etc/dhcpd.conf default file, problem was in subnets addresses.
I did not know, that I need ACTIVE eth0 and eth1 to start dhcpd.
solved.

[franck_T]

hi may i know what means active eth0 and eth1 is it just and ifup or you need to modify the /etc/sysconfig/dhcp

thanks
franck

[franck_T]

just in case it helps. I did have the same problem using bridges.

I wanted nat a subnet and want to dhcp all machines behind your subnet.

here is what i did (my bridge is rubisbr0 and it is routing packets between eth0 and all my VM in the subnet)

edit /etc/dhcpd.conf
-----------------------------------

# Required for dhcp 3.0+ / Red Hat 8.0+
ddns-update-style interim;
ignore client-updates;

default-lease-time 259200;
max-lease-time 518400;

subnet 192.168.1.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.1;
option domain-name "rubisva.ch";
range 192.168.1.50 192.168.1.100;
option domain-name-servers 128.178.15.227,128.178.15.229;
}

now build the bridge and iptable routing
----------------------------------------------------------
brctl addbr rubisbr0
ip addr add 192.168.1.1/24 dev rubisbr0
ip link set rubisbr0 up
iptables -t filter -F
iptables -t mangle -F
iptables -t nat -F
iptables -t filter -P FORWARD DROP
iptables -t mangle -A FORWARD -i rubisbr0 -o eth0 -j MARK --set-mark 1
iptables -t filter -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -t filter -A FORWARD -m mark --mark 1 -j ACCEPT
iptables -t nat -A POSTROUTING -m mark --mark 1 -j MASQUERADE
service dhcpd restart

[lun2lan]

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.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.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.