在FreeBSD和Linux路由表里标记的差异

2009-01-09 07:43 • 本文约393字，阅读大致需要1分钟 • Dev Notes

对比一下FreeBSD和Linux的关于路由表Flags的定义相同的有

U   Up: The route is active.
H   Host: The route destination is a single host.
G   Gateway: Send anything for this destination on to this remote system, which will figure out from there where to send it.

FreeBSD独有的:

S   Static: This route was configured manually, not automatically generated by the system.
C   Clone: Generates a new route based upon this route for machines we connect to. This type of route is normally used for local networks.
W   WasCloned: Indicated a route that was auto-configured based upon a local area network (Clone) route.
L   Link: Route involves references to Ethernet hardware.

Linux独有的：

1
2
3
4
5
6


R (reinstate route for dynamic routing)
D (dynamically installed by daemon or redirect)
M (modified from routing daemon or redirect)
A (installed by addrconf)
C (cache entry)
!  (reject route)

FreeBSD里常看到的是UC, UHLW, UGS, UGHS这几种。UC根据本地网络配置自动生成的，UHLW是由UC根据连接情况自动生成的，UGS是手工配置的段网关路由，UGHS是手工配置的主机网关路由。

Linux里常看到的是U, UG, UGH这几种。U和BSD的UC是一样的，UG和UGS一样，UGH和UGHS一样，没有UHLW。

BSD明确区别了手工添加和自动生成，Linux则没有。还是BSD强大呀，XD

Ref:

FreeBSD Handbook: Gateways and Routes
Linux man page: route(8)

在线阅读本文 Guixing's Jail https://blog.khsing.net/2009/01/route-flags-in-freebsd-and-linux.html