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What is the meaning of mac route flag? I believe many inexperienced people don't know what to do about it. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

1. View the current status of the routing table

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

Define flag in your code:

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

Line availabl

After reading the above, have you mastered the meaning of mac route flag? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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