Why NetworkManager adds incorrect ETHTOOl_OPTS?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 8.6
  • NetworkManager (version 1.36.0-7.el8_6)
  • ifcfg-rh method

Issue

  • When changing the ethtool options for parameters like pause-rx , pause-tx, pause-autoneg , incorrect options are getting added in /etc/sysconfig/network-scripts/ifcfg-<interface>

Resolution

  • Red Hat investigated this issue and delivered a fix in NetworkManager-1.40.4-1.el8 through errata RHBA-2023:2968. If this issue still occurs in your environment after updating, open a support case in the Red Hat Customer Portal referring to this solution.

Workaround

- Use the keyfile method.

# cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=keyfile

After this you may need to configure the interface again, as profiles are stored in /etc/NetworkManager/system-connections/ for keyfile.

Diagnostic Steps

  • Configure an interface with multiple ethtool options:

   $ nmcli con add type ethernet ifname eno1 con-name eno1  ipv4.method manual ipv4.address 10.0.0.0/24

   $ nmcli con up eno1

   $ nmcli con mod eno1 ethtool.pause-autoneg off

   $ nmcli con up eno1

   $ nmcli con modify eno1 ethtool.ring-rx 512

   $ nmcli con up eno1
  • Check the interface configuration file:
cat /etc/sysconfig/network-scripts/ifcfg-eno1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
IPADDR=10.0.0.0
PREFIX=24
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eno1
UUID=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa
DEVICE=eno1
ONBOOT=yes
ETHTOOL_OPTS="-G eno1 rx 512 pause-autoneg off"  <<----  value for  ETHTOOL_OPTS is incorrect.

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