mac route flag的含义是什么

mac route flag的含义是什么，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

1.查看路由表的当前状态

netstat -rn

https://apple.stackexchange.com/questions/336888/whats-the-meanings-of-the-routing-tables-data-in-the-mac-os

 1       RTF_PROTO1       Protocol specific routing flag #1
 2       RTF_PROTO2       Protocol specific routing flag #2
 3       RTF_PROTO3       Protocol specific routing flag #3
 B       RTF_BLACKHOLE    Just discard packets (during updates)
 b       RTF_BROADCAST    The route represents a broadcast address
 C       RTF_CLONING      Generate new routes on use
 c       RTF_PRCLONING    Protocol-specified generate new routes on use
 D       RTF_DYNAMIC      Created dynamically (by redirect)
 G       RTF_GATEWAY      Destination requires forwarding by intermediary
 H       RTF_HOST         Host entry (net otherwise)
 I       RTF_IFSCOPE      Route is associated with an interface scope
 i       RTF_IFREF        Route is holding a reference to the interface
 L       RTF_LLINFO       Valid protocol to link address translation
 M       RTF_MODIFIED     Modified dynamically (by redirect)
 m       RTF_MULTICAST    The route represents a multicast address
 R       RTF_REJECT       Host or net unreachable
 r       RTF_ROUTER       Host is a default router
 S       RTF_STATIC       Manually added
 U       RTF_UP           Route usable
 W       RTF_WASCLONED    Route was generated as a result of cloning
 X       RTF_XRESOLVE     External daemon translates proto to link address
 Y       RTF_PROXY        Proxying; cloned routes will not be scoped

在代码中定义flag：

https://www.freebsd.org/cgi/man.cgi?query=route&sektion=4&manpath=netbsd

Flags include the values:

     #define RTF_UP       0x1          /*       route usable */
     #define RTF_GATEWAY   0x2            /*       destination is a gateway */
     #define RTF_HOST    0x4          /*       host entry (net otherwise) */
     #define RTF_REJECT        0x8          /*       host or net unreachable */
     #define RTF_DYNAMIC   0x10        /*       created dynamically (by redirect) */
     #define RTF_MODIFIED  0x20      /*       modified dynamically (by redirect) */
     #define RTF_DONE          0x40         /*       message confirmed */
     #define RTF_MASK           0x80         /*       subnet mask present */
     #define RTF_CONNECTED 0x100     /*  hosts on this route are neighbours */
     #define RTF_LLDATA        0x400     /*  used by apps to add/del L2 entries */
     #define RTF_STATIC        0x800     /*  manually added */
     #define RTF_BLACKHOLE 0x1000    /*       just discard pkts (during updates) */
     #define RTF_PROTO2        0x4000    /*  protocol specific routing flag */
     #define RTF_PROTO1    0x8000    /*  protocol specific routing flag */
     #define RTF_SRC       0x10000   /*       route has fixed source address */
     #define RTF_ANNOUNCE  0x20000   /*       announce new ARP or NDP entry */
     #define RTF_LOCAL      0x40000   /*       route represents a local address */
     #define RTF_BROADCAST 0x80000   /*  route represents a bcast address */

2. UCS

RTF_UP

RTF_CLONING

RTF_STATIC

3. RTF

routing flag

4. Route usable

线路可用

看完上述内容，你们掌握mac route flag的含义是什么的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注行业资讯频道，感谢各位的阅读！