dhcp-client and IPv4 lease times

[Bob Harold]

On Tue, Dec 7, 2021 at 12:52 PM Mike <the.lists at mgm51.com> wrote:

> I'm running dhcp-client-4.4.2.P1 from packages on OpenBSD 7.0, amd64..
>
> The IPv4 lease renewal times seem odd to me.
>
> From the environment passed to the script specified in dhclient4.conf, I
> see, among others, the following variables:
>
> new_dhcp_lease_time=45605
> new_dhcp_rebinding_time=34805
> new_dhcp_renewal_time=2405
>
>
> In the log for the dhclient daemon I see the following entry (sanitized):
>
> dhclient: ... -- renewal in 2121 seconds.
>
>
> I have two questions:
>
> 1) Why is the renewal time specified in the log different than any of
> the renewal times passed in the environment?
>
> 2) Why is not the renewal time taken to be half the lease time?
>
> Thanks.


If you are using failover, then the initial lease time is "mclt".  Are you
using failover?

There is also a setting " dhcp-cache-threshold" that can affect lease
times.  Do you have that set?

-- 
Bob Harold
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