101 lines
2.8 KiB
Markdown
101 lines
2.8 KiB
Markdown
# wg-mtu-auto
|
||
[](https://github.com/sponsors/kevinveenbirkenbach) [](https://www.patreon.com/c/kevinveenbirkenbach) [](https://buymeacoffee.com/kevinveenbirkenbach) [](https://s.veen.world/paypaldonate)
|
||
|
||
|
||
Automatically detect the optimal WireGuard MTU by analyzing your local egress interface and optionally probing the Path MTU (PMTU) to one or more remote hosts.
|
||
The tool ensures stable and efficient VPN connections by preventing fragmentation and latency caused by mismatched MTU settings.
|
||
|
||
---
|
||
|
||
## ✨ Features
|
||
|
||
- **Automatic Egress Detection** — Finds your primary internet interface automatically.
|
||
- **WireGuard MTU Calculation** — Computes `wg0` MTU based on egress MTU minus overhead (default 80 bytes).
|
||
- **Optional Path MTU Probing** — Uses ICMP “Don’t Fragment” (`ping -M do`) to find the real usable MTU across network paths.
|
||
- **Multi-Target PMTU Support** — Test multiple remote hosts and choose an effective value via policy (`min`, `median`, `max`).
|
||
- **Dry-Run Mode** — Simulate changes without applying them.
|
||
- **Safe for Automation** — Integrates well with WireGuard systemd services or Ansible setups.
|
||
|
||
---
|
||
|
||
## 🚀 Installation
|
||
|
||
### Option 1 — Using [pkgmgr](https://github.com/kevinveenbirkenbach/package-manager)
|
||
|
||
If you use Kevin Veen-Birkenbach’s package manager (`pkgmgr`):
|
||
|
||
```bash
|
||
pkgmgr install automtu
|
||
````
|
||
|
||
This will automatically fetch and install `wg-mtu-auto` system-wide.
|
||
|
||
### Option 2 — Run directly from source
|
||
|
||
Clone this repository and execute the script manually:
|
||
|
||
```bash
|
||
git clone https://github.com/kevinveenbirkenbach/wg-mtu-auto.git
|
||
cd wg-mtu-auto
|
||
sudo python3 main.py --help
|
||
```
|
||
|
||
---
|
||
|
||
## 🧩 Usage Examples
|
||
|
||
### Basic detection (no PMTU)
|
||
|
||
```bash
|
||
sudo automtu
|
||
```
|
||
|
||
### Specify egress interface and force MTU
|
||
|
||
```bash
|
||
sudo automtu --egress-if eth0 --force-egress-mtu 1452
|
||
```
|
||
|
||
### Probe multiple PMTU targets (safe policy: `min`)
|
||
|
||
```bash
|
||
sudo automtu --pmtu-target 46.4.224.77 --pmtu-target 2a01:4f8:2201:4695::2
|
||
```
|
||
|
||
### Choose median or max policy
|
||
|
||
```bash
|
||
sudo automtu --pmtu-target 46.4.224.77,1.1.1.1 --pmtu-policy median
|
||
sudo automtu --pmtu-target 46.4.224.77,1.1.1.1 --pmtu-policy max
|
||
```
|
||
|
||
### Dry-run (no system changes)
|
||
|
||
```bash
|
||
automtu --dry-run
|
||
```
|
||
|
||
---
|
||
|
||
## 🧪 Development
|
||
|
||
Run unit tests using:
|
||
|
||
```bash
|
||
make test
|
||
```
|
||
|
||
To see installation guidance (does not install anything):
|
||
|
||
```bash
|
||
make install
|
||
```
|
||
|
||
---
|
||
|
||
## 👤 Author
|
||
|
||
**Kevin Veen-Birkenbach**
|
||
[https://www.veen.world](https://www.veen.world)
|
||
|