garbage filters in "DisplayString"

permalink · #1 (**permalink**) 01-07-2008

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gentelmen,

could somebody please explain the following curiosities i am =
experiencing with net-snmp (i'm converting oid's to ascii =
representation, but can not achieve same result as snmp-agend does)

below is a correct output of snmp-agent:
JUNIPER-FIREWALL-MIB::jnxFWCounterPacketCount.=20
"Balticum_in"."Balticum_in".counter =3D Counter64: 5708439665
=20
JUNIPER-FIREWALL-MIB::jnxFWCounterPacketCount.=20
"Balticum_in"."Balticum_in-input".policer =3D Counter64: 27
=20
JUNIPER-FIREWALL-MIB::jnxFWCounterPacketCount.=20
"microlink_peer_in"."microlink_peer_in".counte r =3D Counter64: =
105103046552

but, oid values (representing decimaly indexed ascii symbols) seems to =
have some aditional info (marked red):
..1.3.6.1.4.1.2636.3.5.2.1.4.
11.66.97.108.116.105.99.117.109.95.105.110.11.66.9 7.108.116.105.99.117.10=
9.95.105.110.2 =3D Counter64: 5708439665

..1.3.6.1.4.1.2636.3.5.2.1.4.
11.66.97.108.116.105.99.117.109.95.105.110.17.66.9 7.108.116.105.99.117.10=
9.95.105.110.45.105.110.112.117.116.3 =3D Counter64: 27

..1.3.6.1.4.1.2636.3.5.2.1.4.
17.109.105.99.114.111.108.105.110.107.95.112.101.1 01.114.95.105.110.17.10=
9.105.99.114.111.108.105.110.107.95.112.101.101.11 4.95.105.110.2 =3D =
Counter64: 105103046552

Acording to =
(http://net-snmp.sourceforge.net/docs...textconventio=
ns) - graphics characters (32-126) are interpreted as US ASCII, 0-31 =
have speciall meaning.

Here's the whole table of aditional indexes i've found. (symbols in =
double quotes "" arre allready converted to ascii)
11 11 2
11 17 3
12 21 2
12 25 2
12 30 3
12 "&" 3
17 17 2
17 29 3
18 18 2
18 30 3
18 18 2
18 30 3
19 19 2
19 " " 3
22 22 2
22 "&" 3
23 23 2
23 "(" 3
23 23 3
25 21 3
26 26 2
26 " " 3
27 "$" 2
27 "(" 2
27 "(" 2
27 "-" 3
27 5 3
27 20 3
29 29 2
29 " " 3
30 30 2
30 """ 3
31 31 31=20
31 "#" 3
31 31 2
31 """ 3
"#" "#" 2
"$" 1 3
"'" "'" 2
"'" "7" 3
"(" "(" 2
"(" "9" 3
=20
As you can see - i have a garbage in output [ symbols like =
&,$,#,",),(,7,9 ]
So, instead of "Balticum_in"."Balticum_in" i have =
"Balticum_in9Balticum_out" etc...

Is this a faulty mib issue? How does the snmp agent manages to show =
correct results?
I've taken a look at sources, but was unable to find an explanation of =
this misbehaviour.

any thoughts are welcome...

thank you
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dwindows-1257">
<META content=3D"MSHTML 6.00.2900.3243" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>gentelmen,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>could somebody please explain the =
following=20
curiosities i am experiencing with net-snmp (i'm converting oid's to =
ascii=20
representation, but can not achieve same result as snmp-agend =
does)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>below is a correct output of=20
snmp-agent:</FONT></DIV>
<DIV>
<DIV><FONT face=3DArial =
size=3D2>JUNIPER-FIREWALL-MIB::jnxFWCounterPacketCount.<SPAN=20
class=3D912500412-07012008><FONT =
color=3D#0000ff> </FONT></SPAN></FONT></DIV>
<DIV><FONT size=3D+0><FONT face=3DArial><FONT size=3D2><SPAN=20
class=3D912500412-07012008> </SPAN>"Balticum_in"."Balticum_in".count=
er =3D=20
Counter64: 5708439665<BR><SPAN class=3D912500412-07012008><FONT=20
color=3D#0000ff> </FONT></SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D+0><FONT size=3D+0><FONT face=3DArial><FONT =
size=3D2><SPAN=20
class=3D912500412-07012008> </SPAN>JUNIPER-FIREWALL-MIB::jnxFWCounte=
rPacketCount.<SPAN=20
class=3D912500412-07012008><FONT=20
color=3D#0000ff> </FONT></SPAN></FONT></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D+0><FONT size=3D+0><FONT size=3D+0><FONT =
face=3DArial><FONT=20
size=3D2><SPAN=20
class=3D912500412-07012008> </SPAN>"Balticum_in"."Balticum_in-input"=
..policer=20
=3D Counter64: 27<BR><SPAN class=3D912500412-07012008><FONT=20
color=3D#0000ff> </FONT></SPAN></FONT></FONT></FONT></FONT></FONT></=
DIV>
<DIV><FONT size=3D+0><FONT size=3D+0><FONT size=3D+0><FONT =
size=3D+0><FONT=20
face=3DArial><FONT size=3D2><SPAN=20
class=3D912500412-07012008> </SPAN>JUNIPER-FIREWALL-MIB::jnxFWCounte=
rPacketCount.<SPAN=20
class=3D912500412-07012008><FONT=20
color=3D#0000ff> </FONT></SPAN></FONT></FONT></FONT></FONT></FONT></=
FONT></DIV>
<DIV><FONT size=3D+0><FONT size=3D+0><FONT size=3D+0><FONT =
size=3D+0><FONT=20
face=3DArial><FONT size=3D2><SPAN=20
class=3D912500412-07012008> </SPAN>"microlink_peer_in"."microlink_pe=
er_in".counter=20
=3D Counter64: =
105103046552</FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>but, oid values =
(representing decimaly indexed=20
ascii symbols) seems to have some aditional info (marked=20
red):<BR>.1.3.6.1.4.1.2636.3.5.2.1.4.<BR><FONT=20
color=3D#ff0000>11</FONT>.66.97.108.116.105.99.117.109.95.105.110.<FON T=20
color=3D#ff0000>11</FONT>.66.97.108.116.105.99.117.109.95.105.110.<FON T=20
color=3D#ff0000>2</FONT> =3D Counter64: 5708439665</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>.1.3.6.1.4.1.2636.3.5.2.1.4.<BR><FONT=20
color=3D#ff0000>11</FONT>.66.97.108.116.105.99.117.109.95.105.110.<FON T=20
color=3D#ff0000>17</FONT>.66.97.108.116.105.99.117.109.95.105.110.45.1 05.=
110.112.117.116.<FONT=20
color=3D#ff0000>3</FONT> =3D Counter64: 27</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>.1.3.6.1.4.1.2636.3.5.2.1.4.<BR><FONT=20
color=3D#ff0000>17</FONT>.109.105.99.114.111.108.105.110.107.95.112.10 1.1=
01.114.95.105.110.<FONT=20
color=3D#ff0000>17</FONT>.109.105.99.114.111.108.105.110.107.95.112.10 1.1=
01.114.95.105.110.<FONT=20
color=3D#ff0000>2</FONT> =3D Counter64: 105103046552</FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><FONT =
color=3D#000000>Acording to=20
(</FONT><A=20
href=3D"http://net-snmp.sourceforge.net/docs/mibs/ucdDlmodMIB.html#textco=
nventions">http://net-snmp.sourceforge.net/docs...dMIB.html#tex=
tconventions</A><FONT=20
color=3D#000000>) - graphics characters (32-126) are interpreted as US =
ASCII, 0-31=20
have speciall meaning.</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Here's the whole table of aditional =
indexes i've=20
found. (symbols in double quotes "" arre allready converted to=20
ascii)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>11 11 2</FONT></DIV></DIV>
<DIV><FONT face=3DArial size=3D2>11 17 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>12 21 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>12 25 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>12 30 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>12 "&" 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>17 17 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>17 29 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>18 18 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>18 30 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>18 18 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>18 30 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>19 19 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>19 " " 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>22 22 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>22 "&" 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>23 23 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>23 "(" 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>23 23 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>25 21 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>26 26 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>26 " " 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>27 "$" 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>27 "("  2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>27 "("  2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>27 "-"  3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>27 5 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>27 20 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>29 29 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>29 " " 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>30 30 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>30 """ 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>31 31 31 </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>31 "#" 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>31 31 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>31 """ 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"#" "#" 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"$" 1 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"'" "'" 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"'" "7" 3</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"(" "(" 2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"(" "9" 3</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>As you can see - i have a garbage in =
output [=20
symbols like &,$,#,",),(,7,9 ]</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>So, instead of =
"Balticum_in"."Balticum_in" i have=20
"Balticum_in9Balticum_out" etc...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Is this a faulty mib issue? How does =
the snmp agent=20
manages to  show correct results?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I've taken a look at sources, but was =
unable to=20
find an explanation of this misbehaviour.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>any thoughts are =
welcome...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>thank you</FONT></DIV></BODY></HTML>

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