Initial version

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = tab

.gitignore

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+*.pyc
+*.swp
+*.un~
+.pytest_cache
+.idea
+dist
+*.egg-info
+/docs/build/

.isort.cfg

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+[settings]
+multi_line_output=3
+include_trailing_comma=True
+force_grid_wrap=0
+use_parentheses=True
+line_length=88

Makefile

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+PYTHON_BIN ?= poetry run python
+
+format: isort black
+
+black:
+	$(PYTHON_BIN) -m black --target-version py38 --exclude '/(\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist|node_modules|webpack_bundles)/' .
+
+isort:
+	$(PYTHON_BIN) -m isort src
+
+publish:
+	poetry publish

README.md

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+mtuprobe
+========
+
+A tool to probe the current
+[MTU](https://en.wikipedia.org/wiki/Maximum_transmission_unit) on an IPv4 path.
+
+So far it's compatible with Linux only however it can very easily be adapted
+to any other operating system.
+
+## Installation
+
+```
+pip install mtuprobe
+```
+
+## Usage
+
+The default options are sane and should give you good results. Suppose that
+you want to know the current effective MTU towards `wikipedia.org`, in a shell
+you can try:
+
+```
+% mtuprobe wikipedia.org
+Max packet size:         1464
+Expected ethernet MTU:   1492
+```
+
+You can check out `mtuprobe -h` to get the complete list of options.
+
+Values are:
+
+- **Max packet size** — Max packet size specified to `ping`, meaning the
+  size of the data segment of the ICMP packet
+- **Expected ethernet MTU** — That's what the MTU should be if you're
+  transmitting over Ethernet and the header sizes are what is expected from
+  such a setup. This should apply most of the time but surely some weird
+  network setups could violate this.

pyproject.toml

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+[tool.poetry]
+name = "mtuprobe"
+version = "0.1.0"
+description = "A tool to find out maximum MTU size on an IPv4 path"
+authors = ["Rémy Sanchez <[email protected]>"]
+license = "WTFPL"
+readme = "README.md"
+homepage = "https://github.com/Xowap/mtuprobe"
+repository = "https://github.com/Xowap/mtuprobe"
+documentation = "https://github.com/Xowap/mtuprobe"
+
+[tool.poetry.scripts]
+mtuprobe = 'mtuprobe.__main__:__main__'
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.dev-dependencies]
+isort = "^5.6.4"
+black = "^20.8b1"
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"