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SIOCSIFADDR: File exists after upgrading kernel

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linux-howto

http://unix.stackexchange.com – Since upgrading my (Gentoo) kernel from 2.6.38 to 3.3.8 (via oldconfig), I can't get the network on eth0 up anymore. It reports "SIOCSIFADDR: File exists" with a number of other SIOCSIF* errors that seem related. I have the CONFIG_BNX2=y configuration for the Broadcom NetXtreme II NIC that the machine has (which we have been using for years) enabled in the new kernel. Any hints? (HowTos)