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How to configure systemd to bring up a virtual network interface from a vlan trunk.

Prerequisite

• Debian 9 (aka Stretch) or probably most of the systemd installations.
• Knowledge of how to manage network setup with systemd.
• No other managers for the network, like network-manager, ifup/down etc.
• Trunked connection to …

Wrap-up about the sr-iov, some passage may be forgotten.

Expose the SR-IOV virtual network interfaces ¹

Search for the pci interfaces (here the server has a 4 port intel network card).

root@srv:~# find /sys -name sriov_numvfs

/sys/devices/pci0000:00/0000:00:1c.0/0000:06:00.2/sriov_numvfs …

This is a quick tips to simulate a fake mailserver useful if you want to test and application which send emails.

You need netcat (nc) software installed and no email server active on the port 25.

In order to open the privilege port 25 I use the root user. The …