2. Add hosts.SNMP AGENT SETUP
UNIX AGENT
1. Boot your PC in Linux. Login as a root (password is rootpass).
2. Check that the SNMP agent (snmpd daemon) is running on your Linux PC.
ps aux | grep snmpd
If SNMP demon is not running start it with command:
/usr/sbin/snmpd -c /etc/snmpd.conf
3. Change sysContact and sysLocation data:
Edit file /etc/snmpd.local.conf with text editor vi and add lines:
syslocation STRING
syscontact STRING
Restart SNMP agent. Command is:
killall -HUP snmpd
CISCO ROUTER AGENT
1. Check that you have IP connectivity with your router (try to ping router from
your PC). If it is necessary connect with Ethernet your PC and router and setup
IP address on router Ethernet interface.
2. Log into your router and enter privilege mode.
3. Enable the SNMP agent (in configure mode):
snmp-server community public ro
snmp-server community secret rw
4. Enable SNMP traps (in configure mode)
snmp-server host your_PC_IP_address public
snmp-server enable traps
5. Change sysContact and sysLocation data (in configure mode):
snmp-server location Budapest
snmp-server contact CEENet student
Cisco router PC
COMMAND LINE SNMP COMMANDS
1. Examine some SNMP object with snmpget command
Syntax for snmpget command:
snmpget hostname community objectID [objectID] ...
Example:
snmpget localhost public system.sysContact.0
snmpget localhost public .1.3.6.2.1.1.4.0
snmpget localhost public .iso.org.dod.internet.mgmt.
-> cont.mib-2.system.sysContact.0
Examine some other objects:
system.sysName.0
system.sysLocation.0
interfaces.ifTable.ifEntry.ifInOctets.1
2. Set some SNMP object with snmpset command
Syntax for snmpset command:
snmpset hostname community objectID type value [objectID type value] ...
Example:
snmpset localhost public system.sysContact.0 s "CEENet student"
Set some other objects:
system.sysLocation.0
NOTE: some objects are by definition READ ONLY (example ip.inReceives.0)
3. Walk MIB tree with snmwalk command
Syntax for snmpwalk command:
snmpwalk hostname community [objectID]
Example:
snmpwalk localhost public system
Try snmwalk on some other part of SNMP tree:
ip
interfaces
host
SNMP TRAPS
1. Open separate terminal window and start daemon for receiving SNMP traps.
Command is:
/usr/sbin/snmptrapd -p
2. Send some test traps:
snmptrap localhost public "" "" 3 0 ""
Try to change value for trap type (numbers 3 and 0) in snmptrap command and
look for results.
Shut down some interface on your router or change router configuration and
look into traps data.
For description of MIB variable look into directory /usr/share/snmp/mibs .
For detail description of snmp commands look at man pages for: snmpwalk, snmpset, snmpget, snmptrap, snmptrapd, and snmpd .
Commands are:
man snmpwalkman snmpset
GRAPHICAL TOOL TKINED
1. Start tkined tool.
Command is:
tkined &
2. Add hosts.
a). Select adding of hosts (click on icon number 1).
b). Add hosts (your PC and router). For adding click inside working area(2).
c). Change host parameters. Click with right mouse key(3). Change name of host
and host address. Address should be 127.0.0.1 For router put address of
router Ethernet 0 interface.
2. Start network managing tools (click on option 4)
From menu select SNMP tools and try to get the same SNMP variables as in
lab with command line tools.
3. Try to browse SNMP variables with "SNMP tree" tool.
4. Try all other available tools.
MRTG TOOL
To make configuration easier, use tool cfgmaker. Syntax for command is:
cfgmaker community@address_of_your_router_or_host
Example:
cfgmaker community@address_of_your_router_or_host > new.cfg
Add information where will be MRTG results:
echo "WorkDir: /home/http/html/mrtg/results" >> new.cfg
Add information where are MRTG icons:
echo "IconDir: /home/http/html/mrtg" >> new.cfg
For more information about configuring MRTG look into config.html file in documentation directory (/usr/doc/mrtg-2.8.12/doc).
mrtg new.cfg