--- title: Medium | daily.dev description: Part 3 of a Kubernetes networking deep dive series, covering what happens to a packet after it leaves a container's network namespace and enters the host.... canonical: https://daily.dev/posts/medium-wddx69mmc twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Medium | daily.dev og:description: Part 3 of a Kubernetes networking deep dive series, covering what happens to a packet after it leaves a container's network namespace and enters the host.... og:url: https://daily.dev/posts/medium-wddx69mmc og:image: https://api.daily.dev/og/posts/wddx69MMC.png og:image:alt: Medium og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Medium **[Medium](https://daily.dev/sources/medium_js)** · 4 min read · 0 upvotes · 0 comments ## Summary Part 3 of a Kubernetes networking deep dive series, covering what happens to a packet after it leaves a container's network namespace and enters the host. Explains four core Linux networking concepts: Linux bridges (virtual Layer 2 switches used by Docker and Flannel), routing tables (how Linux determines the next hop), default gateways (next-hop routers for traffic leaving the local network), and IP forwarding (the kernel setting that allows packets to be forwarded between interfaces). Includes practical examples like reading the routing table and checking /proc/sys/net/ipv4/ip_forward. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Inside the Packet: How Kubernetes Networking Actually Works at L3/L4](https://daily.dev/posts/inside-the-packet-how-kubernetes-networking-actually-works-at-l3-l4-mlktkkrux) · Container Journal · 1 upvotes · 0 comments - [Understanding Kubernetes Networking](https://daily.dev/posts/understanding-kubernetes-networking-oooxha7or) · cilium · 22 upvotes · 1 comments - [Kubernetes Networking Explained Without the Hand-Waving](https://daily.dev/posts/kubernetes-networking-explained-without-the-hand-waving-b9yscwngi) · Medium · 5 upvotes · 1 comments - [A Survey of the 7 Configuration Changes That Turn a Multi-homed Linux Host into a Switch/Router – blog](https://daily.dev/posts/a-survey-of-the-7-configuration-changes-that-turn-a-multi-homed-linux-host-into-a-switch-router-bl-lcmrlvhci) · Hacker News · 0 upvotes · 0 comments --- Tags: [#kubernetes](https://daily.dev/tags/kubernetes) [View this post on daily.dev](https://daily.dev/posts/medium-wddx69mmc) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Medium","url":"https://daily.dev/posts/medium-wddx69mmc","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/medium-wddx69mmc"},"datePublished":"2026-07-20T19:34:18.199Z","dateModified":"2026-07-20T19:35:53.266Z","description":"Part 3 of a Kubernetes networking deep dive series, covering what happens to a packet after it leaves a container's network namespace and enters the host....","image":"https://media.daily.dev/image/upload/s--1KxV4ohY--/f_auto/v1722860400/public/Placeholder%2007","thumbnailUrl":"https://media.daily.dev/image/upload/s--1KxV4ohY--/f_auto/v1722860400/public/Placeholder%2007","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/medium-wddx69mmc","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"kubernetes","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Medium"}]} ```