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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