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。

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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

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标题名称：macrouteflag的含义是什么
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