DNX: Minimal cross-platform DNS changer

Overview

DNX is a small Python CLI and library for viewing and changing per-interface DNS servers on Linux, macOS, and Windows. It picks a sensible backend automatically (e.g. systemd-resolved, NetworkManager, or /etc/resolv.conf on Linux; PowerShell DNS cmdlets on Windows; networksetup on macOS), validates IP addresses, and can ping resolvers to show latency before or after you switch. Operations that change system DNS typically require administrator privileges.

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Installation

Source Code

• Download Version 0.1 or Latest Source
• pip install .

PyPI

• Check Python Packaging User Guide
• pip install dnx==0.1

Usage

In Python

Backend and current DNS

>>> from dnx.dns import get_backend, get_platform, Platform
>>> get_platform()
<Platform.LINUX: 'linux'>
>>> backend = get_backend()
>>> backend.get_dns()
['192.168.1.1']

Set DNS (requires admin / elevated process)

>>> from dnx.dns import get_backend
>>> backend = get_backend()
>>> backend.set_dns(["8.8.8.8", "8.8.4.4"])
>>> backend.get_dns()
['8.8.8.8', '8.8.4.4']

Ping helpers

>>> from dnx.ping import ping_server, verify_servers
>>> ping_server("1.1.1.1", count=2)
PingResult(ip='1.1.1.1', reachable=True, ...)
>>> verify_servers(["8.8.8.8", "1.1.1.1"])
(True, [PingResult(...), PingResult(...)])

Exceptions

>>> from dnx.exceptions import DNXError, InvalidIPError
>>> from dnx.dns import validate_ips
>>> validate_ips(["999.0.0.1"])
Traceback (most recent call last):
...
InvalidIPError: ...

CLI

ℹ️ You can use dnx or python -m dnx to run this program.

Version

> dnx --version
dnx 0.1

List presets

> dnx list
google: 8.8.8.8, 8.8.4.4
cloudflare: 1.1.1.1, 1.0.0.1
...

List presets with latency

ℹ️ Sends a few ICMP probes per preset IP (may require permission for raw ping on some systems).

> dnx list --latency
Checking latency for all presets...

google:
  8.8.8.8: 12.3ms avg (0% loss)
  ...

Current DNS

> dnx current
Current DNS servers:
  192.168.1.1

Current DNS with latency

> dnx current --latency
Current DNS servers:
  1.1.1.1

Latency:
  1.1.1.1: 8.1ms avg (0% loss)

Set DNS (preset or IPs)

ℹ️ set and reset require an elevated shell (e.g. Administrator on Windows, sudo on Linux/macOS).

> dnx set cloudflare
Using preset 'cloudflare': 1.1.1.1, 1.0.0.1
DNS updated successfully!

Latency comparison:
  Before:
    192.168.1.1: 2.1ms avg (0% loss)
  After:
    1.1.1.1: 9.0ms avg (0% loss)

> dnx set 9.9.9.9 149.112.112.112 --verify

ℹ️ --verify pings first and asks before continuing if a server is unreachable. --no-latency skips the before/after latency block.

Ping only

ℹ️ Preset name or one or more IP addresses. Use -c / --count for probe count.

> dnx ping cloudflare -c 4
Pinging 2 server(s)...

1.1.1.1: 7.5ms avg (0% loss)
1.0.0.1: 8.2ms avg (0% loss)

Reset to system default

> dnx reset
DNS reset to system default

Interface override

ℹ️ When auto-detected interface is wrong (VPN, multiple NICs), pass --iface before the subcommand:

> dnx --iface "Wi-Fi" current

Issues & Bug Reports

Just fill an issue and describe it. We'll check it ASAP! You can also email dnx@openscilab.com.

• Please complete the issue template

You can also join our discord server

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