[PVE-User] link down for network interface

[PVE-User] link down for network interface

[Leandro Roggerone]

Hi guys ...
Yesterday was working on my datacenter cabling my new proxmox network
interfaces.
I connected a network port to my mikrotik router.
Before coming home I checked network linked condition and physically was ok
, both leds blinking on both side , router and server nic. (eno1)
Now , working remotely can see that server interface has no link.
Very strange since interface at router is up.
Any idea ? I never seen something similar (one side  link ok  and the other
is down).
Here can I share some outputs:
root@pve2:~# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens2f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0
state UP mode DEFAULT group default qlen 1000
    link/ether a0:d3:c1:f5:37:08 brd ff:ff:ff:ff:ff:ff
3: ens2f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr1
state UP mode DEFAULT group default qlen 1000
    link/ether a0:d3:c1:f5:37:09 brd ff:ff:ff:ff:ff:ff
4: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq master vmbr2
state DOWN mode DEFAULT group default qlen 1000
    link/ether 40:a8:f0:2a:18:80 brd ff:ff:ff:ff:ff:ff
5: eno2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq master vmbr3
state DOWN mode DEFAULT group default qlen 1000

as you can see eno1 is down ... while can see link up on the other
connected side.
I will change cable tomorrow, but wanted to share this experience with you.
BTW , already tryed autonegociation , and fixed 100, 1000Mb.
Regards.
Leandro.

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Re: [PVE-User] link down for network interface

[Chris Hofstaedtler | Deduktiva]

* Leandro Roggerone <leandro@tecnetmza.com.ar> [210407 17:25]:
> Hi guys ...
Please consider that more than one gender exists.

> Yesterday was working on my datacenter cabling my new proxmox network
> interfaces.
> I connected a network port to my mikrotik router.
> Before coming home I checked network linked condition and physically was ok
> , both leds blinking on both side , router and server nic. (eno1)
> Now , working remotely can see that server interface has no link.
> Very strange since interface at router is up.
> Any idea ? I never seen something similar (one side  link ok  and the other
> is down).

> root@pve2:~# ip link
[..]
> 4: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq master vmbr2
> state DOWN mode DEFAULT group default qlen 1000
>     link/ether 40:a8:f0:2a:18:80 brd ff:ff:ff:ff:ff:ff
> 
> as you can see eno1 is down ... while can see link up on the other
> connected side.

You did not tell us the brand and make or driver of that network
card. Some Intel cards are known to be extremely picky about autoneg
and power save settings, (short) cables, etc.

Best luck,
Chris

-- 
Chris Hofstaedtler / Deduktiva GmbH (FN 418592 b, HG Wien)
www.deduktiva.com / +43 1 353 1707

Re: [PVE-User] link down for network interface

[Leandro Roggerone]

Veeeery strange.
After removing the vlan aware flag on the interface configuration could get
the link up.
Fortunately I have a second nic on this server so I will use it instead.
Have not much time to debug this.
Thanks.

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El mié, 7 abr 2021 a las 19:04, Chris Hofstaedtler | Deduktiva (<
chris.hofstaedtler@deduktiva.com>) escribió:

> * Leandro Roggerone <leandro@tecnetmza.com.ar> [210407 17:25]:
> > Hi guys ...
> Please consider that more than one gender exists.
>
> > Yesterday was working on my datacenter cabling my new proxmox network
> > interfaces.
> > I connected a network port to my mikrotik router.
> > Before coming home I checked network linked condition and physically was
> ok
> > , both leds blinking on both side , router and server nic. (eno1)
> > Now , working remotely can see that server interface has no link.
> > Very strange since interface at router is up.
> > Any idea ? I never seen something similar (one side  link ok  and the
> other
> > is down).
>
> > root@pve2:~# ip link
> [..]
> > 4: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq master
> vmbr2
> > state DOWN mode DEFAULT group default qlen 1000
> >     link/ether 40:a8:f0:2a:18:80 brd ff:ff:ff:ff:ff:ff
> >
> > as you can see eno1 is down ... while can see link up on the other
> > connected side.
>
> You did not tell us the brand and make or driver of that network
> card. Some Intel cards are known to be extremely picky about autoneg
> and power save settings, (short) cables, etc.
>
> Best luck,
> Chris
>
> --
> Chris Hofstaedtler / Deduktiva GmbH (FN 418592 b, HG Wien)
> www.deduktiva.com / +43 1 353 1707
>
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