[Dnsmasq-discuss] DHCP mangling IP address, host name

[duane-dnsmasq-discuss at evenson.ca]

I'm getting a confusing result with my DHCP server part.

$ sudo grep -v -E '^$|^#'  /etc/dnsmasq.conf
domain-needed
bogus-priv
strict-order
no-resolv
no-poll
server=1.1.1.1
server=9.9.9.10
server=80.80.80.80
local=/example.com/
interface=eth0
expand-hosts
domain=example.com
dhcp-range=192.168.0.2,192.168.0.254
dhcp-host=00:25:f6:03:2a:5d,iris,192.168.0.10/24
dhcp-authoritative
selfmx
.

Except for obscuring my domain name, this is the output of the conf 
file. Her is my /etc/hosts file:

$ sudo cat /etc/hosts
127.0.0.1       ian     localhost
::1             ian     localhost ip6-localhost ip6-loopback
192.168.0.1     ian     ian mail localhost localhost.localdomain
fe00::0     ip6-localnet
ff00::0     ip6-mcastprefix
ff02::1     ip6-allnodes
ff02::2     ip6-allrouters
192.168.0.2     dave
192.168.0.3     edward
192.168.0.4     fred
192.168.0.9     helen
192.168.0.10    iris
192.168.0.17    oscar
192.168.0.21    henry

Here is what I get in syslog:


$ sudo grep dnsmasq /var/log/syslog

...

Dec 17 09:35:54 ian systemd[1]: Starting dnsmasq - A lightweight DHCP 
and caching DNS server...
Dec 17 09:35:54 ian dnsmasq[14594]: dnsmasq: syntax check OK.
Dec 17 09:35:54 ian dnsmasq[14599]: started, version 2.80 cachesize 150
Dec 17 09:35:54 ian dnsmasq[14599]: compile time options: IPv6 
GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth 
DNSSEC loop-detect inotify dumpfile
Dec 17 09:35:54 ian dnsmasq[14599]: warning: ignoring resolv-file flag 
because no-resolv is set
Dec 17 09:35:54 ian dnsmasq-dhcp[14599]: DHCP, IP range 192.168.0.2 -- 
192.168.0.254, lease time 1h
Dec 17 09:35:54 ian dnsmasq[14599]: using local addresses only for 
domain example.com
Dec 17 09:35:54 ian dnsmasq[14599]: using nameserver 80.80.80.80#53
Dec 17 09:35:54 ian dnsmasq[14599]: using nameserver 9.9.9.10#53
Dec 17 09:35:54 ian dnsmasq[14599]: using nameserver 1.1.1.1#53
Dec 17 09:35:54 ian dnsmasq[14599]: read /etc/hosts - 16 addresses
Dec 17 09:35:54 ian dnsmasq-dhcp[14599]: not giving name 
fred.example.com to the DHCP lease of 192.168.0.211 because the name 
exists in /etc/hosts with address 192.168.0.4
Dec 17 09:35:54 ian dnsmasq-dhcp[14599]: not giving name fred to the 
DHCP lease of 192.168.0.211 because the name exists in /etc/hosts with 
address 192.168.0.4
Dec 17 09:35:54 ian dnsmasq-dhcp[14599]: not giving name 
henry.example.com to the DHCP lease of 192.168.0.204 because the name 
exists in /etc/hosts with address 192.168.0.21
Dec 17 09:35:54 ian dnsmasq-dhcp[14599]: not giving name henry to the 
DHCP lease of 192.168.0.204 because the name exists in /etc/hosts with 
address 192.168.0.21
Dec 17 09:35:55 ian dnsmasq[14600]: /etc/resolvconf/update.d/libc: 
Warning: /etc/resolv.conf is not a symbolic link to 
/etc/resolvconf/run/resolv.conf
Dec 17 09:35:55 ian systemd[1]: Started dnsmasq - A lightweight DHCP and 
caching DNS server.
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: DHCPDISCOVER(eth0) 
00:25:f6:03:2a:5d
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: DHCPOFFER(eth0) 192.168.0.178 
00:25:f6:03:2a:5d
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: DHCPREQUEST(eth0) 192.168.0.178 
00:25:f6:03:2a:5d
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: Ignoring domain 168.0.10/24 for 
DHCP host name 192
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: DHCPACK(eth0) 192.168.0.178 
00:25:f6:03:2a:5d 192
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: not giving name 
fred.example.com to the DHCP lease of 192.168.0.211 because the name 
exists in /etc/hosts with address 192.168.0.4
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: not giving name fred to the 
DHCP lease of 192.168.0.211 because the name exists in /etc/hosts with 
address 192.168.0.4
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: not giving name 
henry.example.com to the DHCP lease of 192.168.0.204 because the name 
exists in /etc/hosts with address 192.168.0.21
Dec 17 09:36:40 ian dnsmasq-dhcp[14599]: not giving name henry to the 
DHCP lease of 192.168.0.204 because the name exists in /etc/hosts with 
address 192.168.0.21
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: DHCPDISCOVER(eth0) 
00:25:f6:03:2a:5d
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: DHCPOFFER(eth0) 192.168.0.178 
00:25:f6:03:2a:5d
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: DHCPREQUEST(eth0) 192.168.0.178 
00:25:f6:03:2a:5d
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: Ignoring domain 168.0.10/24 for 
DHCP host name 192
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: DHCPACK(eth0) 192.168.0.178 
00:25:f6:03:2a:5d 192
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: not giving name 
fred.example.com to the DHCP lease of 192.168.0.211 because the name 
exists in /etc/hosts with address 192.168.0.4
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: not giving name fred to the 
DHCP lease of 192.168.0.211 because the name exists in /etc/hosts with 
address 192.168.0.4
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: not giving name 
henry.example.com to the DHCP lease of 192.168.0.204 because the name 
exists in /etc/hosts with address 192.168.0.21
Dec 17 09:36:51 ian dnsmasq-dhcp[14599]: not giving name henry to the 
DHCP lease of 192.168.0.204 because the name exists in /etc/hosts with 
address 192.168.0.21

I power recycled the VOIP device (iris) to trigger a DHCP event. You can 
see that the server is trying to use 192 as a hostname and 168.0.10/24 
as an address for some reason.

Why is it mangling the IP address?

Thanks, Duane