Let me preface by saying that I've been using dnsmasq for a couple of years,
without known problems until today.
Today, after having been away for a week, I tried to connect with an internal
server as I've done many, many times, but DNS lookup failed.
So, on the server that's running dnsmasq, I typed (where m1330c is the server
in question), and the response was:
> Server: 127.0.0.1
> Address: 127.0.0.1#53
>
> Non-authoritative answer:
> *** Can't find m1330c: No answer
Now, let me point out that m1330c has a wireless interface and a wired
interface. And both of these are specified in the dnsmasq.conf with preferred
addresses, in the format:
dhcp-host=11:22:33:44:55:66,m1330c,192.168.0.6
dhcp-host=11:22:33:44:55:67,m1330cw,192.168.0.7
I get the same nslookup response for m1330cw
Upon review of the messages log, I found that different addresses are being
assigned (.14 and .15, respectively)... and not only that, but the assignment
is being made every 50-some seconds.
This has been set-it-and-forget-it for me, and I don't remember a lot of the
details I went through for the initial configuration, but I do know that it was
working, and now has stopped, but without configuration changes. A reboot of
the server running dnsmasq did not resolve the issue.
There are a few devices on the network. Three have hard-coded addresses (in
/etc/hosts), and nslookup shows accurate information for them. Those with
DHCP-based addresses all return "can't find ..." messages.
Final bit of information: It appears that the repeat-ip-serving for m1330c/w
has been going on for months, but did not seem to impact operation. But it
seems to happen only to these two interfaces (a Windows 7 server, but not the
only one in the net).
To summarize:
nslookup does not return IP address of DHCP-based servers
"dhcp-host" entries in /etc/dnsmasq.conf are ignored, or at least are not as
expected
Repeated assignment of IP address to two interfaces
Following are the messages from dnsmasq since time of boot. What might I be
missing?
Oct 8 10:46:46 stora-1 dnsmasq[2046]: started, version 2.62 cachesize 150
Oct 8 10:46:46 stora-1 dnsmasq[2046]: compile time options: IPv6 GNU-getopt
no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack
Oct 8 10:46:46 stora-1 dnsmasq-dhcp[2046]: DHCP, IP range 192.168.0.10 --
192.168.0.109, lease time 7d
Oct 8 10:46:46 stora-1 dnsmasq-tftp[2046]: TFTP root is /home/tftpd
Oct 8 10:46:46 stora-1 dnsmasq[2046]: reading /etc/resolv.conf
Oct 8 10:46:46 stora-1 dnsmasq[2046]: using nameserver 65.32.5.112#53
Oct 8 10:46:46 stora-1 dnsmasq[2046]: using nameserver 65.32.5.111#53
Oct 8 10:46:46 stora-1 dnsmasq[2046]: read /etc/hosts - 258 addresses
Oct 8 10:46:58 stora-1 dnsmasq[2046]: reading /etc/resolv.conf
Oct 8 10:46:58 stora-1 dnsmasq[2046]: using nameserver 65.32.5.112#53
Oct 8 10:46:58 stora-1 dnsmasq[2046]: using nameserver 65.32.5.111#53
Oct 8 10:46:58 stora-1 dnsmasq[2046]: ignoring nameserver 127.0.0.1 - local
interface
Oct 8 10:47:35 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:47:35 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:47:35 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:47:35 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:48:35 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:48:35 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:48:36 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:48:36 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:49:37 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:49:37 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:49:37 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:49:37 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:50:41 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:50:41 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:50:41 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:50:41 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:51:42 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:51:42 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:51:42 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:51:42 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:53:35 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:53:35 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:53:35 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:53:35 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:54:36 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:54:36 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:54:37 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:54:37 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
Oct 8 10:55:37 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.14
00:21:9b:cb:e6:dd
Oct 8 10:55:37 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.14
00:21:9b:cb:e6:dd M1330C
Oct 8 10:55:41 stora-1 dnsmasq-dhcp[2046]: DHCPINFORM(eth0) 192.168.0.15
00:21:5c:6a:03:ef
Oct 8 10:55:41 stora-1 dnsmasq-dhcp[2046]: DHCPACK(eth0) 192.168.0.15
00:21:5c:6a:03:ef m1330cw
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