Unix路由表中的“内核”是什么意思?

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我一直在linux-ip.net和整个互联网搜索,但没有出现。
路由表中的“原始内核”部分是什么意思?

只是一个例子:

[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
摘自人ip(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.

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