[Dnsmasq-discuss] Can not set lease time to less than 2m

[Tomas Hozza]

On 02/24/2015 05:26 PM, Jim Alles wrote:
> You must have a very small network and very special requirements?
It was for dhcp client testing purposes.
> From the man pages for dhcp-range:
>
> Enable the DHCP server. Addresses will be given out from the range
> <start-addr> to <end-addr> and from statically defined addresses given in
> *dhcp-host *options.
> If the lease time is given, then leases will be given for that length of
> time. The lease time is in seconds, or minutes (eg 45m) or hours (eg 1h) or
> "infinite". If not given, the default lease time is one hour.
>
> The minimum lease time is two minutes.
Ahh, Thank you. I was looking for "2m" and didn't see this statement.
> For IPv6 ranges, the lease time maybe "deprecated"; this sets the preferred
> lifetime sent in a DHCP lease or router advertisement to zero, which causes
> clients to use other addresses, if available, for new connections as a
> prelude to renumbering.
>
> On Tue, Feb 24, 2015 at 10:11 AM, Tomas Hozza <thozza at redhat.com> wrote:
>
> > Hi.
> >
> > Even though I configure dnsmasq to git leases
> > e.g. for 1 minute it always configures it self
> > with 2m lease time. I was not able to get under
> > 2m, however if the value is greater than 2m, dnsmasq
> > configures itself correctly.
> >
> > using:
> > ...
> > dhcp-range=192.168.99.2,192.168.99.254,1m
> > dhcp-range=fd00:dead:beef:55::100,fd00:dead:beef:55::1ff,1m
> > ...
> >
> > gives:
> > ...
> > dnsmasq-dhcp: DHCP, IP range 192.168.99.2 -- 192.168.99.254, lease time 2m
> > dnsmasq-dhcp: DHCPv6, IP range fd00:dead:beef:55::100 --
> > fd00:dead:beef:55::1ff,
> > lease time 2m
> > ...
> >
> > Why it is so? Seems like a bug IMHO.
> >
> > Regards,
> > --
> > Tomas Hozza
> > Software Engineer - EMEA ENG Developer Experience
> >
> > PGP: 1D9F3C2D
> > Red Hat Inc.                               http://cz.redhat.com

Anyway, my question why is this so and why is the user hard-limited?
Is there some technical reason behind the limit?

Thanks!

Regards,
-- 
Tomas Hozza
Software Engineer - EMEA ENG Developer Experience

PGP: 1D9F3C2D
Red Hat Inc. http://cz.redhat.com