first: cd /usr/src/sys/i386/config cp GENERIC MyKernel
and vi MyKernel add options or rm options
如果想要支持IPFirewall功能。需要添加以下一些options
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freebsd# ipfw -q add 10 allow all from any to 127.0.0.0/8 ipfw: getsockopt(IP_FW_ADD): Protocol not available
哎,我又要重新编释内核
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