How to Change MTU Size

Applies To:

Oracle Cloud Infrastructure - Version N/A and later

Linux OS - Version Oracle Linux 6.0 and later

Linux x86-64

Goal:

This document details steps to change MTU size of a network interface on Oracle Linux 6/7/8.

Solution:

With NetworkManager

This method is suitable for interfaces created/configured using NetworkManager (e.g. nmcli(1)). Here is an example.

[root@host ~]# nmcli connection
NAME    UUID                                  TYPE      DEVICE
enp0s3  e8412b71-6588-4ccf-9acc-b70b923fb415  ethernet  enp0s3
[root@host ~]#
[root@host ~]# date ; nmcli connection add type ethernet ifname enp0s8 con-name enp0s8 autoconnect yes save yes mtu 1500 ip4 <ip_address>/24
Fri Aug 12 21:06:35 AEST 2022
Connection 'enp0s8' (d5873ce6-6022-4bc0-96e7-c901ff1d34f8) successfully added.
[root@host ~]#
[root@host ~]# nmcli connection
NAME    UUID