In article <000201c1f7ae$2c5c2110$4f6015ac@VAIO> (at Thu, 9 May 2002 16:06:37 -0700), "Xiaoning He" [off-list ref] says:

If so, I have looked into the Linux kernel, however, I don't know where
in the Linux kernel the code will check the Neighbor. I tried to search
the function ndisc_send_ns() because I think that's the function who
will handle the sending the NS is there is no entry in the NC. However,
it doesn't help. 

skb->dst->output() is the entry to resolve neighbor when sending
packets.

Also, I think I really need to know the Linux Kernel so that I don't
need always ask this kind of question. Is there any good book and
tutorial available which can give me a overall picture about how to
program the networking program for both user-land and kernel in the
Linux?

keep reading source codes.:-)

--yoshfuji