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====== Docker - Networking - List the Linux bridges on the Docker host ======

Install the brctl command and use it to list the Linux bridges on your Docker host.

===== Install the brctl tools =====

<code bash>
sudo apt install bridge-utils
</code>

----

===== List the bridges on your Docker host =====

<code bash>
brctl show
</code>

returns:

<code>
bridge name     bridge id               STP enabled     interfaces
docker0		8000.b69c547268b7	no		
</code>

<WRAP info>
**NOTE:**  This shows a single Linux bridge called **docker0**.

  * This is the bridge that was automatically created for the bridge network.
  * It has no interfaces currently connected to it.

  * The bridge network is the default network for new containers.
    * This means that unless you specify a different network, all new containers will be connected to the bridge network.

</WRAP>

----

===== View details of the docker0 bridge =====

<code bash>
ip a
</code>

returns:

<code>
...
6: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether b6:9c:54:72:68:b7 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::b49c:54ff:fe72:68b7/64 scope link 
       valid_lft forever preferred_lft forever
...
</code>