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systemd/network/80-container-vz.network
Lennart Poettering 9ccc369ff3 network: mark container/VM/namespace networks as not required for online + disable DHCP lease persistency
These networks are not connections to upstream routers, but where we are
ourselves are the upstream router, hence it doesn't make too much sense
to require them to be up as default to determine if we are "online",
because they lead "in the wrong direction".

Also, disable DHCP lease persistency for these networks, since
container/VM/namespaces are generally shortlived, and typically have no
persistent identity. Moreover, the IP range we assign each VM/container
connection is just too small to permit persistency, as otherwise we'll
run out of leases way too quickly if VM/containers are restarted a bunch of
times with different MAC addresses (which I ran into).

I think these are better defaults, but of course these are only
defaults.
2025-02-09 19:37:38 +09:00

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SYSTEMD

# SPDX-License-Identifier: MIT-0
#
# This config file is installed as part of systemd.
# It may be freely copied and edited (following the MIT No Attribution license).
#
# To make local modifications, use "networkctl edit". See networkctl(1) for details.
# This file should not be edited in place, because it'll be overwritten on upgrades.
# This network file matches the bridge interface created by systemd-nspawn's
# --network-zone= switch. See systemd-nspawn(1) for details.
[Match]
Kind=bridge
Name=vz-*
[Link]
RequiredForOnline=no
[Network]
# Default to using a /24 prefix, giving up to 253 addresses per virtual network.
Address=0.0.0.0/24
LinkLocalAddressing=yes
DHCPServer=yes
IPMasquerade=both
LLDP=yes
EmitLLDP=customer-bridge
IPv6AcceptRA=no
IPv6SendRA=yes
[DHCPServer]
PersistLeases=no