[Dnsmasq-discuss] DHCP Request Flood
Gavin Hill
gavin at highpeak.co.za
Wed Feb 25 09:14:42 GMT 2015
As a quick update, I tried changing
dhcp-range=192.168.1.1,192.168.1.99,static,48h
to
dhcp-range=192.168.1.1,192.168.1.99,static,infinite
Things slowed down a little and I’m seeing fewer log entries, but it still doesn’t explain why the 48h entry didn’t seem to work. I’m assuming 48h is a valid syntax?
> On 24 Feb 2015, at 10:31 AM, Gavin Hill <gavin at highpeak.co.za> wrote:
>
> 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 – gavin at highpeak.co.za <mailto:gavin at highpeak.co.za> – http://www.highpeak.co.za <http://www.highpeak.co.za/> -- @HighpeakHA
>
>
>
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