Date: Fri, 28 Mar 2008 16:39:31 +0100 From: Robert Jesacher <jessy@sicha.net> To: daniel@dgnetwork.com.br Cc: freebsd-net@freebsd.org, freebsd-questions@freebsd.org Subject: Re: Understanding Flags, Refs, Use, Expire in Routing Table Message-ID: <B56F28A5-D4FB-4238-9EA2-9A7127F10488@sicha.net> In-Reply-To: <47EC303B.1040201@dgnetwork.com.br> References: <47EC303B.1040201@dgnetwork.com.br>
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Hi Daniel,
you find mostl of you questions answered in "man netstat" (the =20
relevant passage is posted below)
The missing part is the expiry, which IMHO are the seconds, the ARP =20
entry is valid (after this time a new arp request would be issued)
I hope this is the information you needed.
br,
Robert
+++++++++++++++
The routing table display indicates the available routes and their sta-
tus. Each route consists of a destination host or network, and =20=
a gateway
to use in forwarding packets. The flags field shows a =20
collection of
information about the route stored as binary choices. The =20
individual
flags are discussed in more detail in the route(8) and route(4) =20=
manual
pages. The mapping between letters and flags is:
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 pkts (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 =20=
use
D RTF_DYNAMIC Created dynamically (by redirect)
G RTF_GATEWAY Destination requires forwarding by =20
intermediary
H RTF_HOST Host entry (net otherwise)
L RTF_LLINFO Valid protocol to link address translation
M RTF_MODIFIED Modified dynamically (by redirect)
R RTF_REJECT Host or net unreachable
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 =20
address
Direct routes are created for each interface attached to the =20
local host;
the gateway field for such entries shows the address of the =20
outgoing
interface. The refcnt field gives the current number of active =20=
uses of
the route. Connection oriented protocols normally hold on to a =20=
single
route for the duration of a connection while connectionless =20
protocols
obtain a route while sending to the same destination. The use =20
field pro-
vides a count of the number of packets sent using that route. =20
The inter-
face entry indicates the network interface utilized for the route.
+++++++++++++++++++++
On 28.03.2008, at 00:39, Daniel Dias Gon=E7alves wrote:
> I would like an explanation on each field it command "netstat - rn", =20=
> example:
> Flags,Refs,Use,Expire
> In Flags: UGS, UC, UHLW, UH
> Somebody can explain me ?
>
> Thanks,
> Daniel
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