CENTOS 7默认不带以下无线网卡驱动

Broadcom Corporation BCM4311, BCM4312, BCM4313, BCM4321, BCM4322, BCM43224, BCM43225, BCM43227 and BCM43228 Based Wireless NICs

文中方式亲测可用，写的很详细，很感人。如果你的不行，好好确认每一步。

HowTos/Laptops/Wireless/Broadcom - CentOS Wiki

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