dnsmasq: failed to bind DHCP server socket: Address already in use
 

Hi everyone

i have problem with dnsmasq and dhcp. I cant get dhcp working.

[root@test diplomska]# dnsmasq --log-dhcp
dnsmasq: failed to bind DHCP server socket: Address already in use

This is the setup

[root@test diplomska]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:13:8F:BC:01:30
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15242 errors:0 dropped:0 overruns:0 frame:0
TX packets:15444 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13826515 (13.1 MiB) TX bytes:2387616 (2.2 MiB)
Interrupt:22 Base address:0xa800

eth1 Link encap:Ethernet HWaddr 00:C0:DF:EE:B5:79
inet addr:192.168.3.1 Bcast:192.168.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:23 errors:0 dropped:0 overruns:0 frame:0
TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7866 (7.6 KiB) TX bytes:7476 (7.3 KiB)
Interrupt:22 Base address:0xbc00

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:12119 errors:0 dropped:0 overruns:0 frame:0
TX packets:12119 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:512240 (500.2 KiB) TX bytes:512240 (500.2 KiB)


#############
# INTERFACES#
#############

# Networking Interface
DEVICE=eth0
BOOTPROTO=dhcp
NAME="WAN"
HWADDR=00:13:8F:BC:01:30
ONBOOT=yes
TYPE=Ethernet
PEERDNS=yes
PEERROUTES=yes
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03

# Networking Interface
DEVICE=eth1
BOOTPROTO=none
IPADDR=192.168.3.1
NETMASK=255.255.255.0
NETWORK=192.168.3.0
BROADCAST=192.168.3.255
NAME="LAN"
HWADDR=00:C0:DF:EE:B5:79
ONBOOT=yes
TYPE=Ethernet
PREFIX=24
#PEERDNS=yes
UUID=9c92fad9-6ecb-3e6c-eb4d-8a47c6f50c04

##############
# /etc/hosts #
##############

127.0.0.1 test.router localhost.localdomain localhost
192.168.3.1 router


####################
# /etc/resolv.conf #
####################

nameserver 127.0.0.1

#######################
# /etc/resolv.dnsmasq #
#######################

nameserver 192.168.1.1

#####################
# /etc/dnsmasq.conf #
#####################

domain-needed
bogus-priv
resolv-file=/etc/resolv.dnsmasq
interface=eth1
listen-address=127.0.0.1
listen-address=192.168.3.1
bind-interfaces
expand-hosts
dhcp-range=192.168.3.100,192.168.3.150,12h
log-queries
log-dhcp

#######
# NAT #
#######

iptables -F
iptables -t nat -F
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth1 -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/ip_dynaddr
service iptables restart

#############################
# output od tcpdump -i eth1 #
#############################

02:45:08.290027 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:1e:ec:9a:57:93 (oui Unknown), length 300
02:45:15.048943 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:1e:ec:9a:57:93 (oui Unknown), length 300
02:45:36.063862 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:1e:ec:9a:57:93 (oui Unknown), length 300

i can ping eth1

I think i've found the problem. Interface eth1 should not have an IP address. Don't know why i address that iface in a first place :scratch: .. i am so dumb .. hihihi

Cheers

Actually the output from dnsmasq --log-dhcp is still same.. failed to bind DHCP bla bla bla.. but now is working :))