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Define bridge networks 

Signed-off-by: Misty Stanley-Jones <misty@docker.com>
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Misty Stanley-Jones 2016-12-19 16:53:32 -08:00 committed by Tibor Vass
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docs/reference/glossary.md
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@ -32,6 +32,28 @@ An image that has no parent is a **base image**.
[boot2docker](http://boot2docker.io/) is a lightweight Linux distribution made [boot2docker](http://boot2docker.io/) is a lightweight Linux distribution made
specifically to run Docker containers. The boot2docker management tool for Mac and Windows was deprecated and replaced by [`docker-machine`](#machine) which you can install with the Docker Toolbox. specifically to run Docker containers. The boot2docker management tool for Mac and Windows was deprecated and replaced by [`docker-machine`](#machine) which you can install with the Docker Toolbox.
## bridge
In terms of generic networking, a bridge is a Link Layer device which forwards
traffic between network segments. A bridge can be a hardware device or a
software device running within a host machine's kernel.
In terms of Docker, a bridge network uses a software bridge which allows
containers connected to the same bridge network to communicate, while providing
isolation from containers which are not connected to that bridge network.
The Docker bridge driver automatically installs rules in the host machine so
that containers on different bridge networks cannot communicate directly with
each other.
The default bridge network, which is also named `bridge`, behaves differently
from user-defined bridge networks. Containers connected to the default `bridge`
network can communicate with each other across the bridge by IP address but
cannot resolve each other's container name to an IP address unless they are
explicitly linked using the `--link` flag to `docker run`.
For more information about Docker networking, see
[Understand container communication](https://docs.docker.com/engine/userguide/networking/default_network/container-communication/).
## btrfs ## btrfs
btrfs (B-tree file system) is a Linux [filesystem](#filesystem) that Docker btrfs (B-tree file system) is a Linux [filesystem](#filesystem) that Docker