G + net-snmp over TCP ?

[Gemma Sánchez]

OK Dave, thanks a lot for your answer but excuse me if I make you another
question. I hace understood you mean that there exist an international
standard document (or draft) describing SNMP over TCP? Which is this
standard? I'm very interested in study it, because I thought SNMP only wo=
rks
over UDP. I know TCP is conection oriented while UDP is not, then they ar=
e
different. Then, net-snmp supports SNMP over TCP, isn't it?

Thanks for help me.

----- Original Message -----
From: "Dave Shield" <D.T.S...@csc.liv.ac.uk>
To: "Gemma S=E1nchez" <ge...@us.es>
Cc: "SNMP Users" <net-snm...@lists.sourceforge.net>; "DTE Bely"
<igo...@us.es>
Sent: Tuesday, April 08, 2003 5:09 PM
Subject: Re: net-snmp over TCP ?

>
> > I have read in man snmpd.conf that via "agentaddress" somebody could
make
> > the agent to have a listening address of TCP. I know (or I believe) s=
nmp
> > works over UDP then I can't understand how could this operate. If snm=
p
is
> > ruled by UDP how could it run over TCP?
>
> SNMP is an Application (Layer 7) Protocol.
> It can run over any suitable lower-level transport mechanism.
> There are defined standards for SNMP-over-UDP, SNMP-over-OSI,
> SNMP-over-AppleTalk and SNMP-over-IPX.
> SNMP-over-UDP is simply the most common, and most strongly recommende=
d.
>
> SNMP-over-TCP is a relatively recent, somewhat-experimental transport
> mechanism, but works perfectly well. I'm not sure if it's actually
> on the standards track at the moment, but there are no technical reason=
s
> why it should not be.
>
> The transport mechanism is simply concerned with how you get the
> SNMP request (or response) from one place to another. SNMP itself
> couldn't care less. If you've got two consenting implementations,
> you could run SNMP-over-graffiti-on-the-side-of-a-train if you really
> wanted to.
>
>
> Dave
>
>
>
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[Dave Shield]

> I have understood you mean that there exist an international

> standard document (or draft) describing SNMP over TCP?

Yes.

> Which is this standard?

Try a Google search on

SNMP TCP RFC

Three of the first four references indicate the correct RFC.
(and searching for "SNMP TCP draft", all ten of the first matches
refer to one-or-other of the internet-drafts).

I don't mind providing assistance on this list, but I do slightly
object to doing *everything* for you :-) If you haven't come across
Google, it's high time you did!

> I'm very interested in study it, because I thought SNMP only works
> over UDP.

SNMP will work over *any* transport mechanism.
That's the whole point of the layered model.

UDP is the most common, yes - but fundamentally, SNMP doesn't care at
all about how the requests get from one host to another - just the conten=
t.

> Then, net-snmp supports SNMP over TCP, isn't it?

Yes.
That's why we say so.

Dave