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GNU Dynamic IP update protocol for dynamic DNS management

Core Idea: GnuDIP is an open-source dynamic DNS update protocol that enables clients with changing IP addresses to update their DNS records automatically through a standardized method.

Key Elements

Key Features

• Free and open-source protocol
• Client/server architecture
• Cross-platform compatibility
• Multiple authentication methods
• Support for various DNS server backends

Technical Specifications

• Client connects to server on TCP port 3495 (default)
• Domain-based authentication system
• Supports multiple update methods
• Configuration options for update frequency and timeout
• Extensible architecture for custom implementations

Implementation Details

GnuDIP consists of two primary components:

1. Server: Daemon that accepts connections from clients and updates DNS records
2. Client: Software that detects IP changes and communicates with the server

Protocol Exchange

1. Client connects to server
2. Client sends authentication information
3. Client sends current IP or requests server to detect IP
4. Server updates DNS records
5. Server sends confirmation or error

Use Cases

• Self-hosted dynamic DNS solutions
• Private networks requiring internal name resolution
• Organizations maintaining their own DNS infrastructure
• Custom DDNS implementations with specific requirements
• Privacy-focused alternative to commercial DDNS services

Implementation Example

Sample client implementation in Bash:

#!/bin/bash
# Simple GnuDIP client
SERVER="gnudip.example.com"
PORT=3495
USERNAME="myuser"
PASSWORD="mypassword"
DOMAIN="myhost.example.com"

# Connect and authenticate
exec 3<>/dev/tcp/$SERVER/$PORT
echo -e "0.0.0.0\n$USERNAME\n$PASSWORD\n$DOMAIN\n" >&3

# Read response
read -t 5 -u 3 RESPONSE
echo $RESPONSE

# Close connection
exec 3>&-

Additional Connections

• Broader Context: Dynamic DNS (GnuDIP is a protocol for implementing DDNS)
• Applications: Self-hosted DNS (common use case)
• See Also: QDNS (alternative protocol), ddclient (popular Linux DDNS client)

References

1. GnuDIP project repository: https://savannah.nongnu.org/projects/gnudip/
2. GnuDIP protocol specification
3. Free Software Foundation GNU project

#dynamic-dns #networking #protocols #gnu #open-source #self-hosting

Connections:

Sources:

• From: Worklog n8n