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<TITLE>Problem with cfgmaker after moving mrtg server to new subnet.</TITLE>
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<P><FONT SIZE=2 FACE="Arial">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.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">? Is used to hide the real subnet </FONT>
<BR><FONT SIZE=2 FACE="Arial">SNMP Error:</FONT>
<BR><FONT SIZE=2 FACE="Arial">no response received</FONT>
<BR><FONT SIZE=2 FACE="Arial">SNMPv1_Session (remote host: "172.20.?.11" [172.20.?.11].161)</FONT>
<BR><FONT SIZE=2 FACE="Arial"> community: "public"</FONT>
<BR><FONT SIZE=2 FACE="Arial"> request ID: 614628054</FONT>
<BR><FONT SIZE=2 FACE="Arial"> PDU bufsize: 8000 bytes</FONT>
<BR><FONT SIZE=2 FACE="Arial"> timeout: 2s</FONT>
<BR><FONT SIZE=2 FACE="Arial"> retries: 5</FONT>
<BR><FONT SIZE=2 FACE="Arial"> backoff: 1)</FONT>
<BR><FONT SIZE=2 FACE="Arial"> at /usr/bin/../lib/mrtg2/SNMP_util.pm line 490</FONT>
<BR><FONT SIZE=2 FACE="Arial">SNMPGET Problem for ifInOctets.2 ifOutOctets.2 on public@172.20.?.11:::::1:v4only</FONT>
<BR><FONT SIZE=2 FACE="Arial"> at /usr/bin/mrtg line 2035</FONT>
<BR><FONT SIZE=2 FACE="Arial">Thursday, 25 January 2007 at 17:00: WARNING: skipping because at least the query for ifInOctets.2 on 172.20.?.11 did not succeed</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Thursday, 25 January 2007 at 17:00: WARNING: no data for ifInOctets&ifOutOctets:public@172.20.?.11. Skipping further queries for Ho</FONT></P>
<P><FONT SIZE=2 FACE="Arial">st 172.20.?.11 in this round.</FONT>
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<P><FONT SIZE=2 FACE="Arial">I have done sniffer traces on this activity and what I see looks like no response from server. In the trace I see </FONT>
<BR><FONT SIZE=2 FACE="Arial">Snmp request </FONT>
<BR><FONT SIZE=2 FACE="Arial">Snmp response </FONT>
<BR><FONT SIZE=2 FACE="Arial">ICMP destination unreachable.</FONT>
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<P><FONT SIZE=2 FACE="Arial">I have verified the community string and know that I can do an snmpwalk from servers on other subnets.</FONT>
<BR><FONT SIZE=2 FACE="Arial">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.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Hope you can straighten be out.</FONT>
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