On Sun, 23 Apr 2017 15:36:32 -0700 Jeff Silverman <jeffsilv...@gmail.com> wrote:
> People, > > When my NIC is up, but not connected, I see: > > root@jeff-desktop:~# ip link show enp3s0 > 2: enp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state > DOWN mode DEFAULT group default qlen 1000 > link/ether 00:10:18:cc:9c:77 brd ff:ff:ff:ff:ff:ff > root@jeff-desktop:~# ip link show enp3s0 > > NO-CARRIER makes sense to me - if the wire is unplugged, then the NIC > isn't seeing the humm at the beginning of each packet. That's clear. > Note that even though my link isn't plugged in, ip still notes that > it is up. That's great. > > > But if I down my NIC, there is no indication that it is DOWN other > than you can't see the UP flag. If somebody was new to linux, they > would not see what's not there. > > 2: enp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode > DEFAULT group default qlen 1000 > link/ether 00:10:18:cc:9c:77 brd ff:ff:ff:ff:ff:ff > > > What I would like you to do is modify the ip command so that if the > NIC has been downed by something, then it explicitly says DOWN. > > What would be really nice would be if you enumerated all of the flags > that an interface can have, and note if the flag is set or cleared. > But that's more than what I want with this message. > > > Many thanks, > > > Jeff > If you have a suggestion send a patch. The utility has shown the same output since the earliest versions. Therefore the default output format can't change since people do things like write scripts to parse it. A more verbose output is possible but would have to be enabled by a flag.
