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The stock Ubuntu approach was inadequate. It would DHCP out every nic and take the fastest result, and no going back. Now the CDC nic can frequently win that race. First, rmmod cdc_ether, as a scenario that is completely right out. But beyond that, let Ubuntu have one shot at multi-nic bringup. Beyond that, maintain a list of all link-up devices. If the check should fail, then start doing one nic at a time, cycling through them. Also, the openssl s_client timeout is painfully slow, use subshell and kill to speed up things.