Cannot set NIC speed/duplex permanently?

[rbach]

I have some issues with periodic network dropouts on one of my VM's... And based on my 20+ experience ensuring that the physical NIC runs as fixated speed/duplex is often a good way ensure network stability.

On proxmox host:
Edited /etc/network/interfaces and added 1 line to set it with ethtool.

iface eno1 inet manual
pre-up /usr/sbin/ethtool -s eno1 speed 1000 duplex full autoneg off


However after a reboot it doesn't seem to have effect.
Running ethtool eno1 shows that advertisted link modes is all.
If I manually run ethtool -s eno1 speed 1000 duplex full autoneg off and look at ethtool eno1 it only reports advertised link mode 1000baseT/Full.

What am I missing here???


root@proxmox01:~# ethtool eno1
Settings for eno1:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full

 

[Stoiko Ivanov]

pre-up /usr/sbin/ethtool -s eno1 speed 1000 duplex full autoneg off

on a hunch and without having tested it - does it work if you change pre-up to post-up? (if you set the settings before activating the link it could be that they are reset to default)

I hope this helps!

 

[rbach]

No, changing it to post-up doesn't work either.?

This must be totally basic configuration... I mean fixating speed/duplex on a NIC.
Who knows how to do it on Proxmox?

 

[rbach]

Well... I ended up using crontab instead to ensure it gets set during reboot:

I'd edit root's crontab (crontab -e) and add them via: @reboot /path/to/script