[mrtg] Problem with cfgmaker after moving mrtg server to new subnet.

[Christopher Noyes]

How about an snmpwalk against the server grepping for that interface?  Is 
snmp traffic being blocked between subnets?  I've run into that issue 
here.

-Chris Noyes



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"Mersberger, Robert" <robert.mersberger at goldenven.com> 
Sent by: mrtg-bounces at lists.oetiker.ch
01/29/2007 09:32 AM

To
"Ed LaFrance" <Ed.LaFrance at newmediaems.com>, <mrtg at lists.oetiker.ch>
cc

Subject
Re: [mrtg] Problem with cfgmaker after moving mrtg server to new subnet.





I can ping the device fine.  


From: Ed LaFrance  [mailto:Ed.LaFrance at newmediaems.com] 
Sent: Saturday, January 27, 2007  11:28 AM
To: Mersberger, Robert;  mrtg at lists.oetiker.ch
Subject: Re: [mrtg] Problem with cfgmaker after  moving mrtg server to new 
subnet.

Can you even ping the target from the new origin? This sounds like a 
networking issue that is affecting MRTG and has nothing to do with MRTG 
specifically.

Ed


At 01:52 PM 1/26/2007, Mersberger, Robert  wrote:
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I have 2 AS400 servers on  172.20.x.x/24 and 172.24.X X/24 subnets that I 
have been tracking with mrtg  with the server on a 172.18.x.x/24 subnet . 
Recently we upgraded to the latest  release of Mrtg and it was installed 
on a new subnet 172.31.16.x/22 and these  two as400 servers stop 
communicating with mrtg and cfgmaker. This is the error  message that I 
get.

? Is  used to hide the real subnet 
SNMP Error: 
no response  received 
SNMPv1_Session  (remote host: "172.20.?.11" [172.20.?.11].161) 
                   community: "public" 
                  request ID: 614628054 
                 PDU bufsize: 8000 bytes 
                     timeout: 2s 
                     retries: 5 
                     backoff: 1) 
 at  /usr/bin/../lib/mrtg2/SNMP_util.pm line 490 
SNMPGET Problem for ifInOctets.2 ifOutOctets.2  on 
public at 172.20.?.11:::::1:v4only 
 at /usr/bin/mrtg line 2035 
Thursday, 25 January 2007 at 17:00: WARNING:  skipping because at least 
the query for ifInOctets.2 on  172.20.?.11 did  not succeed

Thursday, 25  January 2007 at 17:00: WARNING: no data for 
ifInOctets&ifOutOctets:public at 172.20.?.11. Skipping further queries for Ho

st 172.20.?.11 in this  round. 

I have done sniffer  traces on this activity and what I see looks like no 
response from  server.  In the trace I see 
Snmp request 
Snmp  response 
ICMP destination  unreachable. 

I have  verified the community string and know that I can do an snmpwalk 
from servers  on other subnets. 
I also check  with the server owner and had him verify that snmp on these 
servers were not  setup to not allow access from this subnet.  I have 
other devices on this  172.24 and 172.20 subnet that are not causing 
problems only these two IBM  servers.

Hope you can  straighten be out. 


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