Configuring Jumbo Frames in vRack

Objective

Jumbo frames are Ethernet frames with more than 1500 bytes of payload. They can carry up to 9000 bytes of payload. Using them minimizes routing processing time. In the case of vRack, this will optimize traffic on it.

This guide explains how to configure your Linux distribution to use Jumbo frames within the vRack.

Requirements

• a vRack
• run a shell as root

Instructions

Step 1: Checking MTU

ip link show | grep mtu

Step 2: Setting new MTU size and test command

ip link set <interface name> mtu 9000

Step 3: Making changes permanent

Edit the file /etc/network/interface and add the following lines to it:

For a DHCP-managed interface

Auto <interface name>

Iface <interface name> inet dhcp

  Pre-up /sbin/ip link set dev <interface name> up mtu 9000</p>

For a fixed IP interface

Auto <interface name>

Iface <interface name> inet static
  mtu 9000

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