Выведем список постоянных записей ARP с помощью утилиты arp.
Установите пакет net-tools.
$ sudo apt install net-tools
Сохраните постоянные записи ARP в файле /etc/ethers.
$ cat <<EOF | sudo tee /etc/ethers 10.0.2.10 01:00:00:02:00:0a 10.0.2.11 01:00:00:02:00:0b 10.0.2.12 01:00:00:02:00:0c EOF
Создайте служебный файл для загрузки этих записей.
$ cat <<EOF | sudo tee /etc/systemd/system/permanent-arp.service [Unit] Description=Load permanent ARP entries ConditionPathExists=/etc/ethers After=network-online.target [Service] Type=oneshot ExecStart=/usr/bin/bash -c "/usr/bin/sleep 5; /usr/sbin/arp -f /etc/ethers" RemainAfterExit=yes [Install] WantedBy=multi-user.target EOF
Перезагрузите конфигурацию менеджера systemd.
$ sudo systemctl daemon-reload
Запустите и включите службу.
sudo systemctl enable --now permanent-arp
Проверьте состояние службы.
$ sudo systemctl status permanent-arp
● permanent-arp.service - Load permanent ARP entries
Loaded: loaded (/etc/systemd/system/permanent-arp.service; enabled; vendor preset: enabled)
Active: active (exited) since Fri 2021-07-23 07:37:57 UTC; 18s ago
Process: 313 ExecStart=/usr/bin/bash -c /usr/bin/sleep 5; /usr/sbin/arp -f /etc/ethers (code=exited, status=0/SUCCESS)
Main PID: 313 (code=exited, status=0/SUCCESS)
CPU: 4ms
Jul 23 07:37:52 bullseye systemd[1]: Starting Load permanent ARP entries...
Jul 23 07:37:57 bullseye systemd[1]: Finished Load permanent ARP entries.
Проверим записи ARP.
$ sudo arp -a
? (10.0.2.2) at 52:54:00:12:35:02 [ether] on eth0 ? (10.0.2.10) at 01:00:00:02:00:0a [ether] PERM on eth0 ? (10.0.2.3) at 52:54:00:12:35:03 [ether] on eth0 ? (10.0.2.12) at 01:00:00:02:00:0c [ether] PERM on eth0 ? (10.0.2.11) at 01:00:00:02:00:0b [ether] PERM on eth0
