[dhclient] persistent database

[Yury Stankevich]

Hello,

i have not stable dhcpd server (over WiFi) and it took some time to get a lease,

but problem is that after client ifdown/ifup - dhclient tell 'No working leases in persistent database - sleeping.'
this is strange, cause server configured to give lease for few days.

i found that on ifdown - dhclient updates leases file,
so before ifdown it looks like:
>>>
lease {
  interface "wlan1";
  fixed-address 192.168.1.70;
  option dhcp-lease-time 864000;
  renew 0 2017/06/04 02:40:44;
  rebind 4 2017/06/08 11:06:05;
  expire 5 2017/06/09 17:06:05;
}
lease {
  interface "wlan1";
  fixed-address 192.168.1.70;
  option dhcp-lease-time 864000;
  renew 6 2017/06/03 19:28:21;
  rebind 4 2017/06/08 11:09:11;
  expire 5 2017/06/09 17:09:11;
}
<<<

and after ifdown
>>>
lease {
  interface "wlan1";
  fixed-address 192.168.1.70;
  option dhcp-lease-time 864000;
  renew 6 2017/06/03 19:28:21;
  rebind 4 2017/06/08 11:09:11;
  expire 5 2017/06/09 17:09:11;
}
lease {
  interface "wlan1";
  fixed-address 192.168.1.70;
  option dhcp-lease-time 864000;
  renew 2 2017/05/30 17:14:46;
  rebind 2 2017/05/30 17:14:46;
  expire 2 2017/05/30 17:14:46;
}
<<<

today is 2017/05/30 17:14:46,
dhclient writes expired lease to persistent database, and unable to reuse one after start.

is this expected behaviour ?


ps:
debian 8, isc-dhclient-4.3.5.