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Sometimes your system may generate an error code indicating an error while registering snmp ifindexes. There can be many reasons for this problem.

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Hello, when I try to save the current configuration, I get the following error:

I tried to clear ifindex from all ininterfaces connected to the router using snmo, but the error still returns.

Sometimes with NMIS and the network in general, you get these weird products that need weird devices that don’t really follow SNMP best practices and standards. Troubleshooting can be a challenge. Here are some tips for what my wife and I have found.

When doing NMIS update like nmis.pl type = update node = NODENAME debug = true, you can stop this SNMP ERROR line below:

This seems strange because SNMP works, only this very important process is not working. Thus, the problem is likely to be related to maintaining the maximum strength of SNMP packets, which is controlled by a so-called one-time retry, ie H. How many SNMP PDUs are packed into an SNMP packet.

To solve the above problems, you can run SNMPWALK on your site as follows:

If you did a TCP DUMP that could be done with this command, you need to make sure you are using TCPDUMP on the interface from which you are sending mailboxes. CheckedLeave the routing table on the server if you have more. have an interface:

What’s interesting: GetBulk (29) N = 0 M = 10 Interfaces.ifTable.ifEntry.ifIndex, this uses a maximum of 10 SNMP PDUs per packet. The command line appears in net-snmp to use the default 10 OR do no bulk migrations. You

If you haven’t configured NMIS lazy retries, check the following:

NMIS will then show you the errors again. This uses the default M = 25, which is set in the Perl NET SNMP collections or somewhere more obscure.

As a result, you need to configure the NMIS node with

Snmp_max_msg_size

The main SNMP-only NMIS configurable parameter is snmp_max_msg_size , which controls the weight of one SNMP packet. May

You must set it as a default system-wide setting (in the System menu under System Configuration) or as a per-host setting (in the Edit Site menu under Advanced Settings).

p>

The extension for snmp_max_msg_size is 1472 bytes, which is slightly below the limit for packets less than 1500 bytes in size for normalEthernet networks. In pure LAN scenarios, it is possible to amplify those last 1500 bytes: this leads to IP fragments and reassembly of packets, but if the LAN is not overloaded and there are no problems with information fragmentation hunger. As you can see, the advantage of a larger SNMP packet is that the collected data can be easily broken down into fewer packets.

To quickly customize the creation you are creating, the following command can use the node_admin.pl tool that comes with NMIS. The max_messagesize value can of course be increased or decreased as needed.

 01:35:35 getIntfInfo, Get interface information for STRANGENODENAME node, TELDAT design and style01:36:23 checkResult, SNMP ERROR (STRANGENODENAME) (ifIndex) No response from remote host "STRANGENODENAME"01:36:23 getIntfInfo, ERROR (STRANGENODENAME) while fetching interface index table01:36:23 forward to, start notification01:36:23 eventAdd, event added, host = STRANGENODENAME, event = SNMP Down, level = Critical, element =, details = SNMP error 

 NMIS # snmpwalk -v 2c -c COMMUNITYSTRING STRANGENODENAME ifIndexIF-MIB :: ifIndex.1 implies INTEGER: 1IF-MIB :: ifIndex.2 = INT: 2IF-MIB :: ifIndex.3 = INT: 3IF-MIB :: ifIndex.4 = INT: 4IF-MIB :: ifIndex.5 = INT: 5IF-MIB :: ifIndex.6 = INT: 6IF-MIB :: ifIndex.7 = INT: 7IF-MIB :: ifIndex.8 means INTEGER: 8IF-MIB :: ifIndex.9 = INT: 9IF-MIB :: ifIndex.10 = INT: 10IF-MIB :: ifIndex.11 = INT: 11IF-MIB :: ifIndex.12 = INT: 12 

 tcpdump -i INTERFACE-Host 2.3.4.5 

 01: 31: 37.093751 IP 1.2.3.4.48560> 2.3.4.5.snmp: C = COMMUNITYSTRING GetBulk (29) N = 0 M = 10 Interfaces.ifTable.ifEntry.ifIndex01: 31: 37.115557 IP 2.3.4.5.snmp> 1.2.3.4.48560: C = COMMUNITYSTRING GetResponse (185) Interfaces.ifTable.ifEntry.ifIndex.1 = 1 Interfaces.ifTable.ifEntry.ifIndex.2 = 2 Interfaces.ifTable .ifEntry.ifIndex.3 = 3 interfaces.ifTable.ifEntry.ifIndex.4 = 4 interfaces.ifTable.ifEntry.ifIndex.5 = 5 interfaces.ifTable.ifEntry.ifIndex.6 = 6 interfaces.ifTable.ifEntry.ifIndex.7 = 7 Interfaces.ifTable.ifEntry.ifIndex.8 = 8 Interfaces.ifTable.ifEntry.ifIndex.9 = 9 Interfaces.ifTable.ifEntry.ifIndex.10 = 1001: 31: 37.116194 IP 1.2.3.4.48560> 2.3.4.5.snmp: C = COMMUNITYSTRING GetBulk (30) N = 0 M = 10 Interfaces.ifTable.ifEntry.ifIndex.1001: 31: 37.139792 IP 2.3.4.5.snmp> 1.2.3.4.48560: C = COMMUNITYSTRING GetResponse (241) Interfaces.ifTable.ifEntry.ifIndex.11 = 11 Interfaces.ifTable.ifEntry.ifIndex.12 = 12 Interfaces.ifTable .ifEntry.ifDescr.1 = "ethernet0 / 0" Interfaces.ifTable.ifEntry.ifDescr.2 = "ethernet0 / 1" Interfaces.ifTable.ifEntry.ifDescr.3 = "serial0 / 0" Interfaces.ifTable.ifEntry.ifDescr. 4 = "bri0 / 0" Interfaces.ifTable.ifEntry.ifDescr.5 = "node x25" Interfaces.ifTable.ifEntry.ifDescr.6 = "voip1 / 0" Interfaces.ifTable.ifEntry.ifDescr.7 = "serial2 / 0 "" interface.ifTable.ifEntry.ifDescr.8 = "fr2" 

 01: 41: 37.093751 IP 1.2.3.4.48560> 2.3.4.5.snmp: C = COMMUNITYSTRING GetBulk (29) N = 0 M = 25 Interfaces.ifTable.ifEntry.ifIndex01: 51: 37.093751 IP 1.2.3.4.48560> 2.3.4.5.snmp: C = COMMUNITYSTRING GetBulk (29) N = 0 M = 25 Interfaces.ifTable.ifEntry.ifIndex 

 NMIS # systemctl status omkdâ— omkd.service - Opmantek web server   Loaded: Loaded (/etc/systemd/system/omkd.Enabled; Maintenance; Dealer Preset: Disabled)   Active: dynamically (in progress) from Thu 09/24/2020 11:02:54 AM UTC; until 10 am Main PID: 3137 (opmantek.pl-Web)   Group C: /system.slice/omkd.service           â "œâ" € 3137 web server opmantek.pl -r -p /var/run/opmantek.exe.pid -r           Opmantek - web server 3253.pl -f -p /var/run/opmantek.exe.-r pid â "œâ" € 3254 opmantek.pl Web server -f -p /var/run/opmantek.exe.pid -r           - web server 3255 opmantek.pl -f -p /var/run/opmantek.exe.pid -r          -… 3256 opmantek.pl Webserver -f -p /var/run/opmantek.exe.pid -r           - "- web server for 3257 euros opmantek.pl -f -p /var/run/opmantek.exe.pid -r24 sep 11:02:22 omk-vm9-centos7 systemd [1]: Opmantek web server starts ...September 24, 11:02:54 am omk-vm9-centos7 systemd [1]: Opmantek web server is running.NMIS # snmpd --versionNET SNMP version: 5.7.2NMIS # kitten / proc / 3253 / stat3253 (opmantek.pl S web) 3137 3137 3137 three -1 4202816 5749 0 0 0 three hundred ninety 43 0 0 20 0 1 9 4442 543064064 64976 18446744073709551615 1 1 null 0 0 0 0 4224 total five 18446744073709551615 0 0 17 0 0 0 3 0 0 0 0 0 0 0 5 0 0 0NMIS # snmpwalk -v 2c -chemical COMMUNITY LINE 127.0.0.1 1.3.6.1.2.1.25.4.2.1.7.3253HOST-RESOURCES-MIB :: hrSWRunStatus.3253 = INTEGER: Invalid (4) 

 /usr/local/nmis9/admin/node_admin.pl act = set node = nodename entry.configuration.max_messagesize = 2800 

 

 

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