systemd/network/80-vm-vt.network

#  SPDX-License-Identifier: LGPL-2.1-or-later
#
#  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 vt-* TUN/TAP devices and applies a similar
# configuration as ve-* to provide NAT/DHCP to VMs.

[Match]
Name=vt-*
Driver=tun

[Network]
# Default to using a /28 prefix, giving up to 13 addresses per VM.
Address=0.0.0.0/28
LinkLocalAddressing=yes
DHCPServer=yes
IPMasquerade=yes
LLDP=yes
EmitLLDP=customer-bridge
IPv6SendRA=yes
license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 07:23:58 +03:00			`# SPDX-License-Identifier: LGPL-2.1-or-later`
network: add TUN/TAP vt-* network rule for VMs VM typically use a TAP device, and work similarly to a veth device from the host side. 2020-04-16 14:05:32 +03:00			`#`
			`# 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 vt-* TUN/TAP devices and applies a similar`
			`# configuration as ve-* to provide NAT/DHCP to VMs.`

			`[Match]`
			`Name=vt-*`
			`Driver=tun`

			`[Network]`
			`# Default to using a /28 prefix, giving up to 13 addresses per VM.`
			`Address=0.0.0.0/28`
			`LinkLocalAddressing=yes`
			`DHCPServer=yes`
			`IPMasquerade=yes`
			`LLDP=yes`
			`EmitLLDP=customer-bridge`
networkd: Enable IPv6SendRA on builtin network files RAs trigger neighbor discovery which allows users to query the LL address of the container/VM via `ip neighbor get dev`. This is useful as it gives users an easy way to connect to the container without needing LLMNR or mDNS to resolve the hostname of the container to an IP address. In practice, this allows connecting with only networkd enabled and without resolved running in the host/container. 2020-12-26 17:27:55 +03:00			`IPv6SendRA=yes`