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The virtual network bridge0 on my Mac is inactive:

bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    options=63<RXCSUM,TXCSUM,TSO4,TSO6>
    ether 82:13:08:b0:ec:c0 
    Configuration:
        id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
        maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
        root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
        ipfilter disabled flags 0x0
    member: en1 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 5 priority 0 path cost 0
    member: en2 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 6 priority 0 path cost 0
    nd6 options=201<PERFORMNUD,DAD>
    media: <unknown type>
    status: inactive

How do I enable it?

My Macbook Pro configuration:

macOS Big Sur
version 11.5.1

MacBook Pro (Retina, 13-inch, Early 2015)

I want to start up the bridge0, because I am studying minikube, which create a docker vm and the minikube bridge attached to bridge0 (from a tutorial, check below snapshot)

enter image description here

my requirement is communicate to minikube cluster IP from my macos.

en1 and en2 config:

$ ifconfig en1 
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=460<TSO4,TSO6,CHANNEL_IO>
    ether 82:13:08:b0:ec:c0 
    media: autoselect <full-duplex>
    status: inactive
$ ifconfig en2
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=460<TSO4,TSO6,CHANNEL_IO>
    ether 82:13:08:b0:ec:c1 
    media: autoselect <full-duplex>
    status: inactive
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3
  • Why do you want to activate your ethernet connection? Are you having trouble connecting to the Internet over wifi? Is there an ethernet cable connected to your computer?
    – Alper
    Commented Oct 14, 2021 at 14:00
  • Welcome to Ask Different. Could you add the output of ifconfig en1 and ifconfig en2 to your question? I have the impression that bridge0 appears as inactive because both members (en1 and en2) are inactive.
    – jaume
    Commented Oct 14, 2021 at 14:12
  • I have updated my post, please check it.
    – 244boy
    Commented Oct 15, 2021 at 2:05

1 Answer 1

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The bridge0 is the Thunderbolt bridge that bridges together the various Thunderbolt 3 adapters in your Mac (in my MacBook Pro 2018, there's 4 of them, all members of bridge0).

Ethernet is a buit-in feature of thunderbolt 3.

To bring this bridge active, you need to bring a Thunderbolt Ethernet interface up, so connect a device that use this feature.

Note: the standard Apple Ethernet adapter is really a USB-C to Ethernet adapter, not Thunderbolt, and doesn't bring up the Thunderbolt interface (it creates a separate interface).

If you really want to bring the bridge up (why?), you can probably add another interface to the bridge (like the USB-C to Ethernet adapter) and connect this interface. You can give it a shot using the brctl command.

Improve this answer
1
  • I have updated my post, please check it.
    – 244boy
    Commented Oct 15, 2021 at 2:05

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