[Dnsmasq-discuss] DHCP doesn't seem to respond to requests(?)

Thu May 19 00:35:52 BST 2011

Hi, All:

I am a new user of DNSMASQ, and I have the DNS portion working great!  What
a great tool, and so easy!

However, I'm struggling with the DHCP portion.  This is being run on a linux
server in my small network, and DHCP has been supplied by the cable modem.
(I did turn off DHCP at the modem.)  I have decided to start small -
connecting with an UBUNTU laptop - but my dhclient eth0 requests
consistently end with "No DHCPOFFERS received."  I've been through the past
year of your logs, looking at subjects including DHCP and didn't find a hit,
so I've come here.

My configuration is simple for now:

domain-needed

bogus-priv

expand-hosts

domain=lovelady.com

dhcp-range=192.168.0.150,192.168.0.249,72h

 ( also added the following line to see if that would improve the situation,
but no joy. :

dhcp-host=00:23:8b:8a:ad:70,192.168.0.249

Server's eth0 configuration is:

eth0      Link encap:Ethernet  HWaddr 00:26:F2:DB:94:4B

          inet addr:192.168.0.251  Bcast:192.168.0.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:47896 errors:0 dropped:0 overruns:0 frame:0

          TX packets:31135 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:532

          RX bytes:7831943 (7.4 MiB)  TX bytes:6542941 (6.2 MiB)

          Interrupt:11

My client connection attempt looks like:

/home/dennis> sudo dhclient eth0

[sudo] password for dennis:

Internet Systems Consortium DHCP Client V3.1.3

For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:23:8b:8a:ad:70

Sending on   LPF/eth0/00:23:8b:8a:ad:70

Sending on   Socket/fallback

DHCPREQUEST of 192.168.0.12 on eth0 to 255.255.255.255 port 67

DHCPREQUEST of 192.168.0.12 on eth0 to 255.255.255.255 port 67

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 17

DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8

No DHCPOFFERS received.

/var/log/messages on the server side looks pretty good (to these untrained
eyes)  :

May 18 19:23:37 lovestora-1 dnsmasq[4673]: started, version 2.57 cachesize
150

May 18 19:23:37 lovestora-1 dnsmasq[4673]: compile time options: IPv6
GNU-getopt no-DBus no-I18N DHCP TFTP no-IDN

May 18 19:23:37 lovestora-1 dnsmasq-dhcp[4673]: DHCP, IP range 192.168.0.150
-- 192.168.0.249, lease time 3d

May 18 19:23:37 lovestora-1 dnsmasq[4673]: reading /etc/resolv.conf

May 18 19:23:37 lovestora-1 dnsmasq[4673]: using nameserver 65.32.5.112#53

May 18 19:23:37 lovestora-1 dnsmasq[4673]: using nameserver 65.32.5.111#53

May 18 19:23:37 lovestora-1 dnsmasq[4673]: read /etc/hosts - 2 addresses

And netstat -panel|grep dnsmask|grep 67 reveals:

tcp        0      0 0.0.0.0:53                  0.0.0.0:*
LISTEN      0          22419      4673/dnsmasq

udp        0      0 0.0.0.0:53                  0.0.0.0:*
0          22418      4673/dnsmasq

udp        0      0 0.0.0.0:67                  0.0.0.0:*
0          22415      4673/dnsmasq

unix  2      [ ]         DGRAM                    22429  4673/dnsmasq

(Wouldn't you know the process ID happens to have 67 imbedded in it?  :\ )

What might I be missing?  How can I diagnose?  I've found a few
troubleshooting tips online, but they all seem to point to configurations
like this one, so I'm baffled.  (I did find a question about iptables, but
couldn't decipher how to determine if that's a problem.)  FTR, my associated
iptables lines look like:

    # and allow DHCP

    iptables -A INPUT -p UDP --dport bootpc -j ACCEPT || die

iptables -A INPUT -p UDP --dport bootps -j ACCEPT || die

I  welcome any advice.

Dennis

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