$ sudo redir :9875 192.168.1.101:78452

$ sudo vim /etc/systemd/system/redir.service
[Unit]
Description=Service redir pour la redirection de ports
After=network-online.target
Wants=network-online.target
 
[Service]
ExecStart=/usr/bin/redir -n -s :9875 192.168.1.101:78452
 
[Install]
WantedBy=multi-user.target

On active le service et on vérifie :

$ sudo systemctl enable redir.service
Created symlink /etc/systemd/system/multi-user.target.wants/redir.service → /etc/systemd/system/redir.service.
 
$ netstat -nat
Connexions Internet actives (serveurs et établies)
Proto Recv-Q Send-Q Adresse locale          Adresse distante        Etat       
(...)   
tcp        0      0 0.0.0.0:9875            0.0.0.0:*               LISTEN 
(...)
 
$ sudo systemctl status redir-odroid.service
● redir-odroid.service - Service redir pour la redirection de ports vers l'Odroid
   Loaded: loaded (/etc/systemd/system/redir-odroid.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2018-12-20 14:38:12 CET; 3s ago
 Main PID: 1846 (redir)
   CGroup: /system.slice/redir-odroid.service
           └─1846 /usr/bin/redir -n -s 9875 192.168.1.101 78452
 
déc 20 14:38:12 raspberrypi systemd[1]: Started Service redir pour la redirection de ports