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From: Marc SCHAEFER <schaefer@alphanet.ch>
Newsgroups: fr.comp.os.linux.configuration
Subject: Re: IP et ethernet (sont dans un bateau)
Date: Sun, 13 Feb 2022 16:54:20 -0000 (UTC)
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Pascal Hambourg <pascal@plouf.fr.eu.org> wrote:
>> 2: enp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
>>      link/ether 94:de:80:b0:41:f7 brd ff:ff:ff:ff:ff:ff
> 
> Désactivée. Active-la et elle devrait passer en UP,NO-CARRIER.

root@virtual:~# ip set link up dev enp2s0

2: enp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 94:de:80:b0:41:f7 brd ff:ff:ff:ff:ff:ff

Effectivement!   Donc ici c'est logiciellement active, matériellement
inactive car pas branchée.  Le DOWN reflète-t-il cette situation?

>> 30: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 100
>>      link/none
> 
> Type d'interface sans couche liaison.

Effectivement, c'est un VPN couche 3, contrairement à l'autre qui est
une couche 2.