Temporary Network Configuration Guideline (Linux)

This guideline describes how to set up a temporary network configuration on a Linux server using ip commands. These changes will only persist until the next reboot.

---

1. Identify Your Network Interface

Check available network interfaces and note the one you want to configure (e.g., ens3).

ip link show

---

2. Flush Existing IP Addresses

Remove all current IP addresses from your interface to avoid conflicts.

sudo ip addr flush dev ens3

Replace ens3 with your actual interface name.

---

3. Assign a New IP Address

Set the desired IP address and subnet mask.

sudo ip addr add 51.1.1.51/24 dev ens3

• 51.1.1.51 is the new IP.

• /24 is the subnet mask (255.255.255.0).

---

4. Bring the Interface Up

Activate the interface if it is down.

sudo ip link set ens3 up

---

5. Set Up Routing

a. Add a Static Route (Optional)

If you need to reach a specific host directly:

sudo ip route add 15.2.2.15 dev ens3

b. Set the Default Gateway

Direct all traffic through the gateway:

sudo ip route add default via 15.2.2.15

---

6. Configure DNS

Set a DNS server to resolve domain names.

echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf

This replaces your /etc/resolv.conf with Google’s DNS.
Note: Changes to /etc/resolv.conf are also temporary and may be overwritten by network managers.

---

7. Automatic Setup Script

You can use the following shell script to automate this temporary network setup.
This script will prompt you for the required details and apply the configuration.

#!/bin/bash

# Temporary Linux Network Configuration (Interactive Script)

echo "=== Temporary Network Configuration ==="

# Prompt for network interface
read -p "Enter the network interface name (e.g., ens3): " IFACE

# Prompt for new IP address (with CIDR)
read -p "Enter the new IP address with CIDR (e.g., 192.168.1.100/24): " IPADDR

# Prompt for Gateway
read -p "Enter the gateway IP address (e.g., 192.168.1.1): " GATEWAY

# Prompt for DNS
read -p "Enter the DNS server IP (e.g., 8.8.8.8): " DNS

echo ""
echo "Applying network changes..."

# Flush existing IP addresses
sudo ip addr flush dev "$IFACE"

# Assign new IP address
sudo ip addr add "\(IPADDR" dev "\)IFACE"

# Bring the interface up
sudo ip link set "$IFACE" up

# Add default gateway
sudo ip route add default via "$GATEWAY"

# Set DNS server
echo "nameserver $DNS" | sudo tee /etc/resolv.conf

echo ""
echo "Network configuration applied (temporarily, until reboot)."
echo "Current network status:"
ip addr show "$IFACE"
ip route

echo ""
echo "Test connectivity (ping DNS server):"
ping -c 4 "$DNS"

echo ""
echo "Done."

Usage:

1. Save as network_setup_prompt.sh.

2. Make executable: chmod +x network_setup_prompt.sh

3. Run: ./network_setup_prompt.sh

4. Follow prompts to input interface, IP address, gateway, and DNS.

Note:
This configuration is temporary and will be lost after a reboot. For permanent changes, edit your network configuration files.

---

8. Verify Configuration

a. Check IP Address

ip a

b. Check Routing Table

ip route

c. Test Connectivity

• Ping gateway or external IP:

  ping -c 4 8.8.8.8
  

• Test DNS:

  ping -c 4 google.com
  

---

9. (Optional) Install Open vSwitch

If you need Open vSwitch for virtual networking:

sudo apt update
sudo apt install openvswitch-switch

---

10. Notes

• Temporary: These changes will be lost after a reboot. For permanent changes, edit your network configuration files (e.g., /etc/network/interfaces, Netplan, or NetworkManager settings).

• Permissions: All commands require root privileges (sudo).

• Interface Name: Replace ens3 with your actual interface name.

---

11. Troubleshooting

• If network is not working, check:

  • IP address assignment: ip a

  • Routing table: ip route

  • DNS settings: cat /etc/resolv.conf

  • Interface status: ip link show ens3

• Re-run commands if you made a mistake or want to reset.

CONTACT:

I’m Kumar Bishojit Paul, the Founder and CEO of BIKIRAN. If you need further assistance, please leave a comment. I’m interested in helping you.

---

🏢 About Bikiran

Bikiran is a software development and cloud infrastructure company founded in 2012, headquartered in Khulna, Bangladesh. With 15,000+ clients and over a decade of experience, Bikiran builds and operates a suite of products spanning domain services, cloud hosting, app deployment, workflow automation, and developer tools.

SL	Topic	Product	Description
1	Website	Bikiran	Main platform — Domain, hosting & cloud services
2	Website	Edusoft	Education management software for institutions
3	Website	n8n Clouds	Managed n8n workflow automation hosting
4	Website	Timestamp Zone	Unix timestamp converter & timezone tool
5	Website	PDFpi	Online PDF processing & manipulation tool
6	Website	Blog	Technical articles, guides & tutorials
7	Website	Support	24/7 customer support portal
8	Website	Probackup	Automated database backup for SQL, PostgreSQL & MongoDB
9	Service	Domain	Domain registration, transfer & DNS management
10	Service	Hosting	Web, app & email hosting on NVMe SSD
11	Service	Email & SMS	Bulk email & SMS notification service
12	npm	Chronopick	Date & time picker React component
13	npm	Rich Editor	WYSIWYG rich text editor for React
14	npm	Button	Reusable React button component library
15	npm	Electron Boilerplate	CLI to scaffold Electron.js project templates
16	NuGet	Bkash	bKash payment gateway integration for .NET
17	NuGet	Bikiran Engine	Core .NET engine library for Bikiran services
18	Open Source	PDFpi	PDF processing tool — open source
19	Open Source	Bikiran Engine	Core .NET engine — open source
20	Open Source	Drive CLI	CLI tool to manage Google Drive from terminal
21	Docker	Pgsql	Docker setup for PostgreSQL
22	Docker	n8n	Docker setup for n8n automation
23	Docker	Pgadmin	Docker setup for pgAdmin
24	Social Media	LinkedIn	Bikiran on LinkedIn
25	Social Media	Facebook	Bikiran on Facebook
26	Social Media	YouTube	Bikiran on YouTube
27	Social Media	FB n8nClouds	n8n Clouds on Facebook