[Dnsmasq-discuss] DHCP Request Flood

[Gavin Hill]

I'm using dnsmasq on a Raspberry Pi as a DHCP and DNS server for my home
network.  I switched to using the Pi as it boots fast and dnsmasq can start
handing out IP addresses on my network quickly after a power failure (IP
cameras, alarms system, etc).

 

Network: 192.168.1.0/24

Range 1-99 static, defined in /etc/dnsmasq.d/reservations file

Range 100-250 dynamic

 

If I check my syslog though, I see many of my static devices requesting IP
addresses every 60 seconds or so, suggesting their leases are only 120
seconds.  I've searched for the issue but the only hits I could find were
related to windows machines looking for and autoconfig option (option 252).
While I've added that option, many of the requests are not coming from
Windows machines anyway.

 

dhcp-range=tag:!known,192.168.1.100,192.168.1.250,12h             #Dynamic
devices

dhcp-range=192.168.1.1,192.168.1.99,static,48h
#Static devices in /etc/dnsmasq.d/reservations e.g.
dhcp-host=00:0c:5d:dc:4f:3c,192.168.1.52,cctv-ptz

 

 

Feb 24 10:15:13 ipam dnsmasq-dhcp[23224]: DHCPREQUEST(eth0) 192.168.1.52
00:0c:5d:dc:4f:3c

Feb 24 10:15:13 ipam dnsmasq-dhcp[23224]: DHCPACK(eth0) 192.168.1.52
00:0c:5d:dc:4f:3c cctv-ptz

[may repetitive entries removed]

Feb 24 10:16:10 ipam dnsmasq-dhcp[23224]: DHCPACK(eth0) 192.168.1.52
00:0c:5d:dc:4f:3c cctv-ptz

Feb 24 10:16:14 ipam dnsmasq-dhcp[23224]: DHCPREQUEST(eth0) 192.168.1.21
00:20:4a:a8:28:fe

 

 

Regards

Gavin

 

--

Gavin Hill -  <mailto:gavin at highpeak.co.za> gavin at highpeak.co.za -
<http://www.highpeak.co.za> http://www.highpeak.co.za -- @HighpeakHA  

 



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