Create a Private VPS Network

What Is a Private Network?

A private network (VPC) provides an isolated Layer 2 network segment for your servers. Traffic between servers on the same private network does not traverse the public internet.

Use Cases

• Database servers accessible only from application servers
• GPU cluster inter-node communication (NCCL)
• Microservices that should not be publicly exposed

Creating a Private Network

1. Go to Network → VPS Networks → Create Network.
2. Choose a region.
3. Specify a CIDR block, e.g. 10.10.0.0/24.
4. Give it a name, e.g. ml-cluster-net.

Attaching Servers to the Network

At Deploy Time

Select the private network in the Advanced Options section of the deploy form.

On a Running Server

1. Go to Servers → [Your Server] → Settings → Private Networks.
2. Click Attach Network.
3. Assign an IP from the CIDR range.

Configuring the Network Interface

After attaching, configure the interface on the server:

$# Find the new interface (usually eth1 or ens4)
$ip link show
$
$# Assign IP manually
$ip addr add 10.10.0.10/24 dev eth1
$ip link set eth1 up
$
$# Make persistent (Ubuntu 22.04 Netplan)
$cat > /etc/netplan/60-private.yaml << EOF
$network:
$  version: 2
$  ethernets:
$    eth1:
$      addresses:
$        - 10.10.0.10/24
$EOF
$netplan apply

Testing Connectivity

$# From server A (10.10.0.10)
$ping 10.10.0.11
$
$# Check latency
$iperf3 -s  # on server B
$iperf3 -c 10.10.0.11  # on server A

Expected throughput: 10+ Gbps within the same region.