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RE: Net-snmp 5.4.2.1/Solaris 5.10 w/ enable-mfd-rewrites:

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Bruce Shaw

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Apr 27, 2009, 3:03:03 PM4/27/09

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kstat sounds like an idea.
=20
By the way, how did you get it to compile on SOlaris 10 to include Sun's
extra agents?
=20
Do you have a ./configure invocation you could share?

________________________________

From: Tackabury, Wayne [mailto:wayne.t...@mirror-image.com]=20
Sent: Friday, April 03, 2009 12:41 PM
To: net-snm...@lists.sourceforge.net
Subject: Net-snmp 5.4.2.1/Solaris 5.10 w/ enable-mfd-rewrites:
TCP-MIBscalar counters showing up as zero

Hi all:

=20

So, when I write in anymore these days, it always seems to be about
Solaris and the enable-mfd-rewrites build option. I'll stay true to
form again.

=20

We've deployed (on non-zoned systems-see prior mail about other problems
there)-a net-snmp 5.4.2.1 build using the enable-mfd-rewrites option to
get 64-bit counter support, in particular for the IfXTable. And all is
good there.

=20

The problem we've discovered is certain objects in the TCP-MIB. The
scalar ones. Specifically:

=20

bash-3.00$ snmpwalk -v 2c -c <xxxx> localhost .1.3.6.1.2.1.6=20

TCP-MIB::tcpRtoAlgorithm.0 =3D INTEGER: 0

TCP-MIB::tcpRtoMin.0 =3D INTEGER: 0 milliseconds

TCP-MIB::tcpRtoMax.0 =3D INTEGER: 0 milliseconds

TCP-MIB::tcpMaxConn.0 =3D INTEGER: 0

TCP-MIB::tcpActiveOpens.0 =3D Counter32: 0

TCP-MIB::tcpPassiveOpens.0 =3D Counter32: 0

TCP-MIB::tcpAttemptFails.0 =3D Counter32: 0

TCP-MIB::tcpEstabResets.0 =3D Counter32: 0

TCP-MIB::tcpCurrEstab.0 =3D Gauge32: 0

TCP-MIB::tcpInSegs.0 =3D Counter32: 0

TCP-MIB::tcpOutSegs.0 =3D Counter32: 0

TCP-MIB::tcpRetransSegs.0 =3D Counter32: 0

=20

It's the tcpActiveOpens and friends I'm particularly interested in.

=20

Now, the tcpConnTable (which is officially deprecated in favor of the
tcpConnectionTable, but work with what you have) seems populated and
reasonable (I've not exhaustively picked it apart, but it has tons of
entries with some remote endpoint addresses that seem credible). Oh,
and this works completely on the same system with a net-snmp 5.4.1, no
enable-mfd-rewrites.

=20

My build does not specify TCP-MIB in the -with-mibdirs line, but as a
standard MIB, it doesn't have to, right? Besides, the agent knows the
counter objects are in scope, it just thinks the counter values are all
zero for the duration of the agent.

=20

I'm going to work around this for now by using some a pass object/script
that goes directly to the Solaris kstat value (which seems correct), but
I wondered if anybody else had run into this or can see the flaw in my
approach.

=20

Thanks!

Wayne Tackabury

Mirror Image Internet

=20

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<DIV dir=3Dltr align=3Dleft>kstat sounds like an idea.</DIV>
<DIV dir=3Dltr align=3Dleft> </DIV>
<DIV dir=3Dltr align=3Dleft>By the way, how did you get it to compile on =
SOlaris 10 to=20
include Sun's extra agents?</DIV>
<DIV dir=3Dltr align=3Dleft> </DIV>
<DIV dir=3Dltr align=3Dleft>Do you have a ./configure invocation you could=20
share?</DIV> 
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
From: Tackabury, Wayne=20
[mailto:wayne.t...@mirror-image.com] Sent: Friday, April =
03,=20
2009 12:41 PM To:=20
net-snm...@lists.sourceforge.net Subject: Net-snmp =
5.4.2.1/Solaris=20
5.10 w/ enable-mfd-rewrites: TCP-MIBscalar counters showing up as=20
zero </DIV>
<DIV></DIV>
<DIV class=3DSection1>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi =
all:<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">So, when I write in =
anymore these=20
days, it always seems to be about Solaris and the enable-mfd-rewrites =
build=20
option.  I’ll stay true to form =
again.<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">We’ve deployed (on =
non-zoned=20
systems—see prior mail about other problems there)—a =
net-snmp 5.4.2.1 build=20
using the enable-mfd-rewrites option to get 64-bit counter support, in=20
particular for the IfXTable.  And all is good=20
there.<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">The problem we’ve =
discovered is=20
certain objects in the TCP-MIB.  The scalar ones. =20
Specifically:<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">bash-3.00$ snmpwalk -v 2c =
-c=20
<xxxx> localhost .1.3.6.1.2.1.6 <o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpRtoAlgorithm.0 =
=3D=20
INTEGER: 0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpRtoMin.0 =3D =
INTEGER: 0=20
milliseconds<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpRtoMax.0 =3D =
INTEGER: 0=20
milliseconds<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpMaxConn.0 =3D =
INTEGER:=20
0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpActiveOpens.0 =
=3D=20
Counter32: 0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpPassiveOpens.0 =
=3D=20
Counter32: 0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpAttemptFails.0 =
=3D=20
Counter32: 0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpEstabResets.0 =
=3D=20
Counter32: 0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpCurrEstab.0 =
=3D Gauge32:=20
0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpInSegs.0 =3D =
Counter32:=20
0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpOutSegs.0 =3D =
Counter32:=20
0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">TCP-MIB::tcpRetransSegs.0 =
=3D=20
Counter32: 0<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">It’s the =
tcpActiveOpens and friends=20
I’m particularly interested in.<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Now, the tcpConnTable =
(which is=20
officially deprecated in favor of the tcpConnectionTable, but work with =
what you=20
have) seems populated and reasonable (I’ve not exhaustively picked =
it apart, but=20
it has tons of entries with some remote endpoint addresses that seem=20
credible).  Oh, and this works completely on the same system with a =

net-snmp 5.4.1, no enable-mfd-rewrites.<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">My build does not specify =
TCP-MIB in=20
the –with-mibdirs line, but as a standard MIB, it doesn’t =
have to, right? =20
Besides, the agent knows the counter objects are in scope, it just =
thinks the=20
counter values are all zero for the duration of the=20
agent.<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I’m going to work =
around this for=20
now by using some a pass object/script that goes directly to the Solaris =
kstat=20
value (which seems correct), but I wondered if anybody else had run into =
this or=20
can see the flaw in my approach.<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Thanks!<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Wayne=20
Tackabury<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Mirror Image=20
Internet<o:p></o:p>
<SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p></DIV></BODY></HTML>

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