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I've been having trouble connecting a macOS 10.13 High Sierra server to a Windows Server 2019 server with a bonded ethernet connection consisting of 3 directly connected ethernet adapters. Windows seems fine, but macOS is giving an error about 802.3ad being unavailable.

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I was able to get this working by setting up a bonded set on macOS with the following command:

# First get your network interfaces:
$ networksetup -listallhardwareports
# Then create the bond with the appropriate ports:
$ networksetup -createBond BondName en1 en2 en7

I then manually assign an IP + subnet via System Preferences -> Network (ie, 192.168.10.1 + 255.255.255.0)

Then on the Windows Server 2019 you go to Server Manager -> Local Server, Bond (click on "Disabled" to configure), then go to the Teams section and TASKS dropdown -> New Team: new team

Then select the ethernet ports you want to be part of your team and the key part select LACP for the teaming mode:

settings

Finally go to Network Connections -> Bond -> Properties and set your IP statically for a connection (eg, 192.168.10.2 + 255.255.255.0).

You're done!

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