"Hạt nhân proto" có nghĩa là gì trong Bảng định tuyến Unix?

Question

Tôi đã tìm kiếm trong linux-ip.net và toàn bộ internet nhưng không xuất hiện gì cả. Phần "hạt nhân proto" có nghĩa là gì trong một bảng định tuyến?

Chỉ cần một ví dụ:

[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 

Answer 1

đoạn trích từ man 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.