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

[Andrey Lelikov]

The culprit is intramfs. Starting with 20 LTS, having an AOE device
brings in local_top/aoe, which calls configure_networking . This causes
dhcp configuration of the primary net interface, which screws up all
network later (as this physical interface is part of the bridge, and
bridge can't get a dhcp lease later).

AOE stands for "ATA over ETHERNET", not ATA over IP. There is zero need
to bring up ip stack for aoe to function.


** Also affects: ubuntu-core-initramfs
   Importance: Undecided
       Status: New

** No longer affects: isc-dhcp (Ubuntu)

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https://bugs.launchpad.net/bugs/1905472

Title:
  Something starts dhcclient for every intrface on boot

Status in ubuntu-core-initramfs:
  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)

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