/lib/systemd/network/80-container-ve.network is in systemd 237-3ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | # SPDX-License-Identifier: LGPL-2.1+
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
# This network file matches the host-side of the virtual Ethernet link
# created by systemd-nspawn's --network-veth switch. See systemd-nspawn(1) for
# details.
[Match]
Name=ve-*
Driver=veth
[Network]
# Default to using a /28 prefix, giving up to 13 addresses per container.
Address=0.0.0.0/28
LinkLocalAddressing=yes
DHCPServer=yes
IPMasquerade=yes
LLDP=yes
EmitLLDP=customer-bridge
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