Debian Static IP Configuration
Complete guide for configuring a static IP address on Debian by replacing DHCP configuration with manual network settings.
Setting up static IP addresses on Debian servers provides consistent network connectivity essential for server environments. This guide shows you how to replace DHCP with static IP configuration.
Quick Configuration Steps
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# 1. Check current network configuration
ip addr show
# 2. Edit network interfaces file
sudo nano /etc/network/interfaces
# 3. Replace DHCP with static configuration (see example below)
# 4. Apply changes
sudo systemctl restart networking.service
SSH Warning: Your SSH session may disconnect when restarting networking. Note your new static IP for reconnection and ensure you have physical/console access as a contingency.
Configuration Change
Before (DHCP):
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auto ens192
iface ens192 inet dhcp
After (Static):
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auto ens192
iface ens192 inet static
address 192.168.1.123
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 192.168.1.1
Parameters Explained
address: Your desired static IP addressnetmask: Subnet mask (255.255.255.0 = /24 network)gateway: Default gateway (usually your router’s IP)dns-nameservers: DNS servers for name resolution
Modern CIDR Alternative
For cleaner configuration, use CIDR notation:
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auto ens192
iface ens192 inet static
address 192.168.1.123/24
gateway 192.168.1.1
dns-nameservers 192.168.1.1
Verify Configuration
Test your new configuration:
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# Check interface
ip addr show ens192
# Test connectivity
ping -c 3 192.168.1.1 # Gateway
ping -c 3 1.1.1.1 # Internet
nslookup google.com # DNS
Conclusion
Static IP configuration on Debian is straightforward: edit /etc/network/interfaces, replace DHCP settings with static parameters, and restart networking. Always have console access ready as your current SSH connection will drop if the IP changes, and if the new static IP is invalid, the server becomes unreachable via SSH.