Debian/Ethernet

Comment faire fonctionner une connexion ethernet pour un ordinateur sous Debian ?

Il peut y avoir plusieurs soucis :

• paramétrage incomplet (inexistant) pour ce type de connexion
• absence de pilote pour gérer la carte réseau derrière la prise RJ45

Cas pratique

Comme pour la plupart des soucis matériels, un coup d'oeil à /var/log est utile.

ls -alt pour voir les fichiers classés temporellement

messages
...
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7663] policy: auto-activating connection 'Wired connection 1'
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7721] device (eno1): Activation: starting connection 'Wired connection 1' (292c29aa-90e2-4c2a-9b1d-74d76e270210)
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7725] device (eno1): state change: disconnected -> prepare (reason 'none') [30 40 0]
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7733] device (eno1): state change: prepare -> config (reason 'none') [40 50 0]
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7758] device (eno1): state change: config -> ip-config (reason 'none') [50 70 0]
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7764] dhcp4 (eno1): activation: beginning transaction (timeout in 45 seconds)
Nov 23 16:24:43 DO790B NetworkManager[500]: <info>  [1542986683.7786] dhcp4 (eno1): dhclient started with pid 32716
Nov 23 16:25:28 DO790B NetworkManager[500]: <warn>  [1542986728.7352] dhcp4 (eno1): request timed out
Nov 23 16:25:28 DO790B NetworkManager[500]: <info>  [1542986728.7352] dhcp4 (eno1): state changed unknown -> timeout
Nov 23 16:25:28 DO790B NetworkManager[500]: <info>  [1542986728.7674] dhcp4 (eno1): canceled DHCP transaction, DHCP client pid 32716
Nov 23 16:25:28 DO790B NetworkManager[500]: <info>  [1542986728.7675] dhcp4 (eno1): state changed timeout -> done
Nov 23 16:25:28 DO790B NetworkManager[500]: <info>  [1542986728.7678] device (eno1): state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
Nov 23 16:25:28 DO790B NetworkManager[500]: <info>  [1542986728.7681] policy: disabling autoconnect for connection 'Wired connection 1'.
Nov 23 16:25:28 DO790B NetworkManager[500]: <warn>  [1542986728.7683] device (eno1): Activation: failed for connection 'Wired connection 1'
Nov 23 16:25:28 DO790B NetworkManager[500]: <info>  [1542986728.7689] device (eno1): state change: failed -> disconnected (reason 'none') [120 30 0]

Commandes utiles

Pour aider à diagnostiquer les soucis.

• nmcli

$ nmcli device
PÉRIPHÉRIQUE     TYPE      ÉTAT                                          CONNEXION          
wlx503eaa471fde  wifi      connecté                                      Orange Airbox-xxxx 
eno1             ethernet  connexion (obtention de la configuration IP)  Wired connection 1 
lo               loopback  non-géré