Section: Linux Programmer's Manual (8)
When the add or del options are used, route modifies the routing tables. Without these options, route displays the current contents of the routing tables.
If dev If is the last option on the command line, the word dev may be omitted, as it's the default. Otherwise the order of the route modifiers (metric - netmask - gw - dev) doesn't matter.
The output of the kernel routing table is organized in the following columns
U (route is up)
H (target is a host)
G (use gateway)
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):
Route for Linux was originally written by Fred N. van Kempen, <firstname.lastname@example.org> and then modified by Johannes Stille and Linus Torvalds for pl15. Alan Cox added the mss and window options for Linux 1.1.22. irtt support and merged with netstat from Bernd Eckenfels.
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