{"id":51691,"date":"2026-04-22T21:22:17","date_gmt":"2026-04-23T01:22:17","guid":{"rendered":"https:\/\/mjtsai.com\/blog\/?p=51691"},"modified":"2026-04-22T21:22:17","modified_gmt":"2026-04-23T01:22:17","slug":"little-snitch-for-linux","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2026\/04\/22\/little-snitch-for-linux\/","title":{"rendered":"Little Snitch for Linux"},"content":{"rendered":"<p><a href=\"https:\/\/obdev.at\/blog\/little-snitch-for-linux\/\">Christian Bender<\/a>:<\/p>\n<blockquote cite=\"https:\/\/obdev.at\/blog\/little-snitch-for-linux\/\">\n<p>I decided to use eBPF for traffic interception at kernel level. It&rsquo;s high performance and much more portable than kernel extensions. The main application code is in Rust, a language I&rsquo;ve wanted to explore for quite a while. And the user interface was built as a web application. That last choice might seem odd for a privacy tool, but it means you can monitor a remote Linux server&rsquo;s network connections from any device, including your Mac. Want to know what Nextcloud, Home Assistant, or Zammad are actually connecting to? Use Little Snitch on the server.<\/p>\n<p>[&#8230;]<\/p>\n<p>But in summary: on Ubuntu, I found 9 system processes making internet connections over the course of one week. On macOS, we counted more than 100.<\/p>\n<p>[&#8230;]<\/p>\n<p>The kernel component, written for eBPF, is open source and you can look at how it&rsquo;s implemented, fix bugs yourself, or adapt it to different kernel versions. The UI is also open source under GPL v2, feel free to make improvements.<\/p>\n<p>[&#8230;]<\/p>\n<p>One important note: unlike the macOS version, Little Snitch for Linux is not a security tool. eBPF provides limited resources, so it&rsquo;s always possible to get around the firewall for instance by flooding tables.<\/p>\n<\/blockquote>\n\n<p>Previously:<\/p>\n<ul>\n<li><a href=\"https:\/\/mjtsai.com\/blog\/2025\/10\/20\/tahoe-wont-unload-network-extensions\/\">Tahoe Won&rsquo;t Unload Network Extensions<\/a><\/li>\n<li><a href=\"https:\/\/mjtsai.com\/blog\/2024\/11\/14\/sequoia-network-extension-memory-leak\/\">Sequoia Network Extension Memory Leak<\/a><\/li>\n<li><a href=\"https:\/\/mjtsai.com\/blog\/2024\/09\/17\/little-snitch-6-and-dns-encryption\/\">Little Snitch 6 and DNS Encryption<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Christian Bender: I decided to use eBPF for traffic interception at kernel level. It&rsquo;s high performance and much more portable than kernel extensions. The main application code is in Rust, a language I&rsquo;ve wanted to explore for quite a while. And the user interface was built as a web application. That last choice might seem [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"2026-04-23T01:22:20Z","apple_news_api_id":"73fd6936-9b22-483e-9f81-2d860f865da9","apple_news_api_modified_at":"2026-04-23T01:22:20Z","apple_news_api_revision":"AAAAAAAAAAD\/\/\/\/\/\/\/\/\/\/w==","apple_news_api_share_url":"https:\/\/apple.news\/Ac_1pNpsiSD6fgS2GD4ZdqQ","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":false,"apple_news_is_preview":false,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":"\"\"","apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[2],"tags":[448,30,2742,476,74,355],"class_list":["post-51691","post","type-post","status-publish","format-standard","hentry","category-technology","tag-linux","tag-mac","tag-macos-tahoe-26","tag-networking","tag-opensource","tag-privacy"],"apple_news_notices":[],"_links":{"self":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/51691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/comments?post=51691"}],"version-history":[{"count":1,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/51691\/revisions"}],"predecessor-version":[{"id":51692,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/51691\/revisions\/51692"}],"wp:attachment":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/media?parent=51691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/categories?post=51691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/tags?post=51691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}