www.ctrl-click.fr

ls -la /etc/netplan

 nano 95-custonm.yaml :

network:
  version: 2
  renderer: NetworkManager
  ethernets:
    eth2:
      optional: true
      dhcp4: false
      link-local: []
    eth4:
      addresses:
      - "172.0.0.1/24"
      nameservers:
        addresses:
        - 192.168.10.2
      dhcp4: false
      routes:
      - to: "0.0.0.0/0"
      via: "192.168.10.1"
 

sudo chmod 600 /etc/netplan/99-custom.yaml
sudo netplan generate    # vérifie l’absence d’erreurs
sudo netplan apply

nmcli connection show

nmcli connection delete "Wired connection 1"

nmcli connection delete "Wired connection 2"

nmcli connection reload
sudo netplan apply

sudo nmcli device set eth2 managed no

nmcli device status

sudo ip addr flush dev eth2
sudo sysctl -w net.ipv4.conf.eth2.arp_ignore=1
sudo sysctl -w net.ipv4.conf.eth2.arp_announce=0

sysctl -p

nano /etc/sysctl.conf

net.ipv4.conf.all.arp_ignore=1
net.ipv4.conf.all.arp_announce=0

ip a show eth2

nano /etc/NetworkManager/dispatcher.d/95-disable-linklocal

#!/bin/bash
IFACE="$1"
STATUS="$2"
		
if [ "$IFACE" = "eth2" ] && [ "$STATUS" = "up" ]; then
  /usr/sbin/ip addr flush dev "$IFACE"
  /usr/sbin/sysctl -w net.ipv4.conf."$IFACE".arp_ignore=1
  /usr/sbin/sysctl -w net.ipv4.conf."$IFACE".arp_announce=0
fi

sudo chmod 755 /etc/NetworkManager/dispatcher.d/90-disable-linklocal

reboot

Regarder le contenu de netplan :
- [code]ls -la /etc/netplan[/code]
Si le fichier 90-… existe (crée par NetworkManager), créer un fichier (supérieur à 90, pour qu'il soit pris en compte, par-dessus au 90-… ), par ex :[code] nano 95-custonm.yaml :[/code]

[code]
network:
version: 2
renderer: NetworkManager
ethernets:
eth2:
optional: true
dhcp4: false
link-local: []
eth4:
addresses:
- "172.0.0.1/24"
nameservers:
addresses:
- 192.168.10.2
dhcp4: false
routes:
- to: "0.0.0.0/0"
via: "192.168.10.1"
[/code]
Enregistrer et fermer.
Puis :
[code]
sudo chmod 600 /etc/netplan/99-custom.yaml
sudo netplan generate # vérifie l’absence d’erreurs
sudo netplan apply[/code]

tapez :
- [code]
nmcli connection show[/code]
[quote]NAME UUID TYPE DEVICE
netplan-eth4 111... ethernet eth4
netplan-eth2 222... ethernet eth2
lo 333... loopback lo
Wired connection 1 444... ethernet --
Wired connection 2 555... ethernet --
/etc/netplan#[/quote]
alors, supprimez les interfaces inutilisés :
[code]nmcli connection delete "Wired connection 1"[/code]
[code]nmcli connection delete "Wired connection 2"[/code]
rechargez netplan :
- [code]
nmcli connection reload
sudo netplan apply[/code]
puis, mettez eth2 en unmanaged :
- [code]sudo nmcli device set eth2 managed no[/code]
Vérifier :
- [code]
nmcli device status[/code]
[quote]nmcli device status DEVICE TYPE STATE CONNECTION
eth4 ethernet connected netplan-eth4
lo loopback connected (externally) lo
eth2 ethernet unmanaged --[/quote]
Désactiver l'adresse ip de eth2 :
- [code]
sudo ip addr flush dev eth2
sudo sysctl -w net.ipv4.conf.eth2.arp_ignore=1
sudo sysctl -w net.ipv4.conf.eth2.arp_announce=0[/code]
puis recharger sysctl :
- [code]sysctl -p[/code]
puis, pour désactiver ces option au redémarrage :
- [code]
nano /etc/sysctl.conf[/code]
[code]net.ipv4.conf.all.arp_ignore=1
net.ipv4.conf.all.arp_announce=0[/code]
Enregistrez et fermez.
Sortie (rem: il n'y a plus d'adresse ip sur "eth2", elle ne comporte plus de champs "inet") :
- [code]ip a show eth2[/code]
[quote]2: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether a1... brd ff:ff:ff:ff:ff:ff[/quote]
Pour que ça marche après redémarrage, il faut encore faire :
Il faut utiliser un hook NetworkManager qui s’exécute après la configuration d’interface :
- [code]nano /etc/NetworkManager/dispatcher.d/95-disable-linklocal[/code]
- [code]
#!/bin/bash
IFACE="$1"
STATUS="$2"

if [ "$IFACE" = "eth2" ] && [ "$STATUS" = "up" ]; then
/usr/sbin/ip addr flush dev "$IFACE"
/usr/sbin/sysctl -w net.ipv4.conf."$IFACE".arp_ignore=1
/usr/sbin/sysctl -w net.ipv4.conf."$IFACE".arp_announce=0
fi[/code]
- [code]sudo chmod 755 /etc/NetworkManager/dispatcher.d/90-disable-linklocal[/code]
- [code]reboot[/code]
Et là, ça marche.




Source : ChatGPT.