[Bug 1905472] [NEW] Something starts dhcclient for every intrface on boot

[Andrey Lelikov]

Public bug reported:

After upgrade frpm 18LTS to 20LTS I've lost the network.

Network is managed by ifupdown
Netplan is not installed
Network manger is disabled (masked)

Yet, at boot, SOMETHING starts dhclient for every network interface.
This has disastrous results - dhcp request succeeds on physical
interface that is a base for a vlan-based interface, causing real dhcp
request on to fail on vlan interface.

Expected behavior - dhclient starts only for interfaces marked as dhcp
in /etc/network/interfaces .

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: isc-dhcp-client 4.4.1-2.1ubuntu5
ProcVersionSignature: Ubuntu 5.8.0-29.31~20.04.1-generic 5.8.14
Uname: Linux 5.8.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Nov 25 00:07:45 2020
SourcePackage: isc-dhcp
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to isc-dhcp in Ubuntu.
https://bugs.launchpad.net/bugs/1905472

Title:
  Something starts dhcclient for every intrface on boot

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  After upgrade frpm 18LTS to 20LTS I've lost the network.

  Network is managed by ifupdown
  Netplan is not installed
  Network manger is disabled (masked)

  Yet, at boot, SOMETHING starts dhclient for every network interface.
  This has disastrous results - dhcp request succeeds on physical
  interface that is a base for a vlan-based interface, causing real dhcp
  request on to fail on vlan interface.

  Expected behavior - dhclient starts only for interfaces marked as dhcp
  in /etc/network/interfaces .

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: isc-dhcp-client 4.4.1-2.1ubuntu5
  ProcVersionSignature: Ubuntu 5.8.0-29.31~20.04.1-generic 5.8.14
  Uname: Linux 5.8.0-29-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.12
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Nov 25 00:07:45 2020
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1905472/+subscriptions