[pkg-dhcp-devel] Bug#844659: isc-dhcp-client: must set future expire date on static leases in dhclient.conf (reopening bug #100886)

[Pavel Mendl]

Package: isc-dhcp-client
Version: 4.3.5~b1-1
Severity: normal

Dear Maintainer,

   * What led up to the situation?
   This behavior comes when DHCP server goes down/gets irresponsible.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   On headless NAS station I have had lease stanza in dhclient.conf, generated 
   by uncommenting default example comming with the package and only adjusting
   values I understood exactly (like IP address, mask, router address etc. I left
   renew, expire and so times intact as I expected they are set in past intentionally
   (e.g. to provoke processing).

   * What was the outcome of this action?
   After DHCP down NAS got irresponsive even on the preconfigured (fallback) ip address.

   * What outcome did you expect instead?
   Finally I took machine out of server room, attached keyboard and monitor and found out
   it really does not configure ip address from lease stanza.
   Using google from other comp I finally found the old Debian bug report #100886.
   Indeed, changing the times to future (even as far as 2020) worked like a charm.

   As the original bug report #100886 even contains patch proposal and it's only "sin"
   is that it was reported against version 2.x while we hav 4.x now (but still containing
   the same bug), I ask politely to review and reconsider that bugreport and apply
   patch (maybe bit adapted to version 4.x) into package code.

   Thank you in advance.

   NOTE: I am reporting from my desktop comp, so the bellow technical details are NOT
   related to the machine in question. However there is some 2 months old Debian 8
   instalation there.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=cs_CZ.UTF-8, LC_CTYPE=cs_CZ.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages isc-dhcp-client depends on:
ii  debianutils       4.8
ii  iproute2          4.8.0-1
ii  libc6             2.24-5
ii  libdns-export162  1:9.10.3.dfsg.P4-10.1
ii  libisc-export160  1:9.10.3.dfsg.P4-10.1

Versions of packages isc-dhcp-client recommends:
ii  isc-dhcp-common  4.3.5~b1-1

Versions of packages isc-dhcp-client suggests:
pn  avahi-autoipd         <none>
pn  isc-dhcp-client-ddns  <none>
pn  resolvconf            <none>

-- no debconf information