# Docker Networking
Confidence: high
Last verified: 2026-05-22
Generation: human_only


## TL;DR

Docker networking provides container connectivity. Drivers: bridge (default, containers on same host), host (container shares host network), overlay (multi-host, Swarm), macvlan (container gets MAC address, appears as physical device), none (isolated). Custom networks enable DNS-based service discovery.

## Core Explanation

Bridge: Docker creates docker0 bridge, containers get IP from 172.17.0.0/16 subnet. `--link` (deprecated) vs. user-defined networks (DNS resolution: container names resolve). Overlay: VXLAN encapsulation across hosts. Port mapping: `-p 8080:80` maps host 8080 to container 80. Network isolation: containers on different networks can't communicate (unless explicitly connected).

## Further Reading

- [Docker Networking Documentation](undefined)