DHCP on my router

Moebius · 07-26-2005, 12:03 AM

I set up debian as a router and I have everything working except the DHCP server. eth0 is connected to the local network and eth1 is connected to my cable modem. When I try to start dhcp I get

moe-server:~# /etc/init.d/dhcp start
Starting DHCP server: dhcpd failed to start - check syslog for diagnostics.

/var/log/daemon.org says:

Jul 25 23:48:03 localhost dhcpd: No subnet declaration for eth1 (xxx.xxx.xxx.xxx).
Jul 25 23:48:03 localhost dhcpd: Please write a subnet declaration in your dhcpd.conf file for the
Jul 25 23:48:03 localhost dhcpd: network segment to which interface eth1 is attached.
Jul 25 23:48:03 localhost dhcpd: exiting.

I don't understand why DHCP should have to know anything about eth1 because I'm only assigning IP addresses to my local network on eth0.

my /etc/init.d/dhcp has the line INTERFACES="eth0"

my /etc/dhcpd.conf looks like:

Code:

authoritative;
ddns-update-style interim;

default-lease-time 259200;
max-lease-time 518400;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.1;
option domain-name-servers 192.168.1.1;
option netbios-name-servers 192.168.1.1;

subnet 192.168.1.0 netmask 255.255.255.0 {
    range 192.168.1.100 192.168.1.250;
}

/etc/network/interfaces

Code:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
name Local Ethernet LAN card
address 192.168.1.1
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0
gateway 192.168.1.1

iface eth1 inet dhcp
name Ethernet LAN card (WAN)

auto eth1

deoren · 07-26-2005, 06:44 AM

https://listman.redhat.com/archives/.../msg00528.html

Perhaps that is what you're looking for?

This doesn't like like it'll help, but here it is anyway:
https://listman.redhat.com/archives/.../msg00737.html

mpeg4codec · 07-26-2005, 08:43 AM

As root, try running:

dhcpd eth0

And see if it still gives you the same error.

Moebius · 07-26-2005, 04:50 PM

mpeg4codec, you were right. starting the server as "dhcpd eth0" works, but using the init.d file doesn't. I looked at it and could not figure out why the $INTERFACES variable wasn't working. So eventually I just replaced this line:

Code:

--exec /usr/sbin/dhcpd -- -q $INTERFACES

with

Code:

--exec /usr/sbin/dhcpd -- -q eth0

I hate these bloody scripts, they never work right.

this is my full, working /etc/init.d/dhcpd

Code:

#!/bin/sh
#
# $Id: dhcp.init.d,v 1.3.2.2 2002/08/11 22:11:54 peloy Exp $
#

test -x /usr/sbin/dhcpd || exit 0

# Defaults
INTERFACES="eth0"

# Reads config file (will override defaults above)
[ -r /etc/default/dhcp ] && . /etc/default/dhcp

DHCPDPID=/var/run/dhcpd.pid

case "$1" in
        start)
                echo -n "Starting DHCP server: "
                start-stop-daemon --start --quiet --pidfile $DHCPDPID \
                        --exec /usr/sbin/dhcpd -- -q eth0
#                       --exec /usr/sbin/dhcpd -- -q $INTERFACES
                sleep 2

                if [ -f "$DHCPDPID" ] && ps h `cat "$DHCPDPID"` >/dev/null; then
                        echo "dhcpd."
                else
                        echo "dhcpd failed to start - check syslog for diagnostics."
                fi
                ;;
        stop)
                echo -n "Stopping DHCP server: dhcp"
                start-stop-daemon --stop --quiet --pidfile $DHCPDPID
                echo "."
                ;;
        restart | force-reload)
                $0 stop
                sleep 2
                $0 start
                ;;
        *)
                echo "Usage: /etc/init.d/dhcp {start|stop|restart|force-reload}"
                exit 1 
esac

exit 0