Routing 什么是；“原始内核”；在Unix路由表中是什么意思？

我一直在linux-ip.net和整个互联网上搜索这个，但什么都没有。 “原始内核”部分在路由表中是什么意思

举个例子：

[root@tristan]# ip route show table local
local 192.168.99.35 dev eth0 proto kernel scope host src 192.168.99.35
broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1

摘自

知识产权（8）

：

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我的linux debian和centos主机没有相同的ip手册页。您引用的是哪个实现/os？@user1928764显然已选中

另请参见
man ip（8）
中的
部分。在那里，您可以找到与您正在阅读的手册页相关的其他手册页（尤其是
man ip路由（8）
）。
  protocol RTPROTO
          the routing protocol identifier of this route.
          RTPROTO may be a number or a string from the
          file /etc/iproute2/rt_protos. If the routing
          protocol ID is not  given,  ip  assumes  protocol
          boot (i.e. it assumes the route was added by 
          someone who doesn't understand what they are doing).
          Several protocol values have a fixed interpretation.
          Namely:

             redirect - the route was installed due to an ICMP redirect.

             kernel - the route was installed by the kernel during
                   autoconfiguration.

             boot - the route was installed during the bootup sequence.
                 If a routing daemon starts, it will purge all of them.

             static - the route was installed by the administrator to
                   override dynamic routing. Routing daemon will
                   respect them and, probably, even advertise them
                   to its peers.

             ra - the route was installed by Router Discovery protocol.

          The rest of the values are not reserved and the administrator is free
          to assign (or not to assign) protocol tags.