change MTU of a network interface (VirtualBox)

[marco.a...@gmail.com]

Hello,

how can I change MTU of a network interface with a Vagrantfile option ?

What I have is:

[root@dev-local ~]# ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:a9:2d:51 brd ff:ff:ff:ff:ff:ff

    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3

       valid_lft 85575sec preferred_lft 85575sec

    inet6 fe80::a00:27ff:fea9:2d51/64 scope link

       valid_lft forever preferred_lft forever

3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:8b:7e:e7 brd ff:ff:ff:ff:ff:ff

    inet 192.168.1.10/24 brd 192.168.1.255 scope global enp0s8

       valid_lft forever preferred_lft forever

    inet6 fe80::a00:27ff:fe8b:7ee7/64 scope link

       valid_lft forever preferred_lft forever

[root@dev-local ~]#

I would like to change MTU of enp0s3 to 1300.

The Vagrantfile is this:

Vagrant.configure(2) do |config|

  config.vm.provider "virtualbox" do |v|

    v.memory = 512

    v.cpus = 1

    v.customize ["modifyvm", :id, "--cpuexecutioncap", "50"]

  end

  config.vm.hostname = "dev-local"

  config.ssh.username = 'root'

  config.ssh.password = 'root'

  config.ssh.insert_key = 'true'

  config.ssh.pty = false

  config.vm.boot_timeout = 600

  config.vm.network "private_network", ip: "192.168.10.10"

  if ENV['ROOT_TFS_MAPPINGS']

    config.vm.synced_folder ENV['ROOT_TFS_MAPPINGS'], "/src"

  end

  if Vagrant.has_plugin?("vagrant-vbguest")

    config.vbguest.auto_update = true

    config.vbguest.no_remote = true

  end

end

If I change manually /etc/sysconfig/network-scripts/ifcfg-enp0s3, the interface has no ip address mounted after a "vagrant reload". It seems that vagrant is in some way aware that the file was manually changed and this causes a failure...

Thanks

[Alvaro Miranda Aguilera]

Hello!

If you know the file you want to use, or the command you need to run, will be quicker if you tell Vagrant to create the interface, but not configure.

  config.vm.network "private_network", ip: "192.168.50.4",
    auto_config: false

Then, you can use a shell provisioner to copy a file from /vagrant/ to the location you require and start the interface manually.

Or you can use a shell provisioner to run the command you need:

ifconfig …. etc

If you got this way, you can tell Vagrant to always run that script. (By default a provisioning script will run on first time)

 config.vm.provision "shell", inline: "echo hello",
    run: "always"

Thanks

Alvaro

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