[Bug 1618717] Re: dhclient fails to set default route

[Philipp]

There was a typo in the old 14.04 script... Which caused dhclient to add the default gateway in any case.
Now the typo is "fixed" and the script is no longer working the old way. Is this intended or just another bug?

I will attach the diff file for the typo.

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Title:
  dhclient fails to set default route

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  
  We are trying to migrate our systems from trusty to xenial. There are no changes to dhcp configurations. On a xenial host, upon running dhclient, the default route does not get set. However, the other static routes do get set. 

  I copied /sbin/dhclient-script from a trusty host to the xenial host
  and ran dhclient and voila the default route got set.

  Version I copied from:
  user at host:~$ dpkg -l isc-dhcp-client
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                       Version            Architecture       Description
  +++-==========================-==================-==================-=========================================================
  ii  isc-dhcp-client            4.2.4-7ubuntu12.4  amd64              ISC DHCP client


  
  AFFECTED VERSION DETAILS
  =========================
  user at host:/var/lib/dhcp$ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04
  Codename:	xenial
  user at host:/var/lib/dhcp$ dpkg -l isc-dhcp-client
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                       Version            Architecture       Description
  +++-==========================-==================-==================-=========================================================
  ii  isc-dhcp-client            4.3.3-5ubuntu12.1  amd64              DHCP client for automatically obtaining an IP address

  user at host:/var/lib/dhcp$ cat dhclient.leases  # some values changed
  lease {
    interface "ens3";
    fixed-address 10.0.0.97;
    filename "pxelinux.0";
    option subnet-mask 255.255.255.0;
    option routers 10.0.0.11;
    option dhcp-lease-time 86400;
    option dhcp-message-type 5;
    option domain-name-servers 127.0.0.1;
    option dhcp-server-identifier 10.0.0.1;
    option dhcp-renewal-time 43200;
    option rfc3442-classless-static-routes 24,10,1,0,10,84,192,66,24,192,168,100,10,0,0,66;
    option broadcast-address 10.0.0.255;
    option dhcp-rebinding-time 75600;
    option host-name "host";
    option domain-name "example.com";
    renew 3 2016/08/31 16:52:44;
    rebind 4 2016/09/01 03:25:21;
    expire 4 2016/09/01 06:25:21;
  }

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