dhcpd 需要内核里的 CONFIG_PACKET 和 CONFIG_FILTER 才能启动
QUOTE:CONFIG_PACKET:
The Packet protocol is used by applications which communicate
directly with network devices without an intermediate network
protocol implemented in the kernel, e.g. tcpdump.
QUOTE:If you say Y here, user-space programs can attach a filter to any
socket and thereby tell the kernel that it should allow or disallow
certain types of data to get through the socket. Linux Socket
Filtering works on all socket types except TCP for now. See the
text file Documentation/networking/filter.txt for more information.
但这不是造成楼主问题的原因
