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 +<!DOCTYPE markdown>
 +{{tag>Brouillon Réseau SNMP}}
 +
 +# Notes SNMP
 +
 +Voir : 
 +* [[Notes SNMPv3]]
 +* https://www.net-snmp.org/docs/FAQ.html
 +* https://wiki.deimos.fr/SNMP_:_Le_protocole_de_gestion_r%C3%A9seaux.html
 +* https://makina-corpus.com/python/initiation-snmp-avec-python-pysnmp-partie-1-le-protocole-et-les-commandes
 +* http://www.sugarbug.web4me.fr/atelier/techniques/monitoring_lan/snmp/
 +* https://support.zoho.com/portal/manageengine/kb/articles/configuring-snmp-on-redhat-linux-server
 +* [Configuration avancée de SNMP sur Linux : redémarrer un service à distance en utilisant le protocole SNMP](https://blog.cedrictemple.net/362-configuration-avancee-de-snmp-sur-linux-redemarrer-un-service-a-distance-en-utilisant-le-protocole-snmp/)
 +* https://docs.redhat.com/fr/documentation/red_hat_enterprise_linux/7/html/system_administrators_guide/sect-system_monitoring_tools-net-snmp#sect-System_Monitoring_Tools-Net-SNMP-Retrieving
 +* https://blog.cedrictemple.net/290-configuration-avancee-de-snmp-sur-linux-les-informations-systemes/
 +
 +Voir les traps SNMP :
 +* [Les traps SNMP](https://documentation-fr.centreon.com/docs/centreon/en/2.8.x/configuration_guide/advanced_configuration/traps.html)
 +* [snmptt](https://servicenav.coservit.com/documentations/2-creer-un-fichier-de-definition-trap/)
 +* [How to define trapsess for snmpv3 without plain passwords in Red Hat Enterprise Linux 6](https://access.redhat.com/solutions/969183)
 +* https://docs.centreon.com/fr/docs/monitoring/passive-monitoring/enable-snmp-traps/
 +
 +
 +Exemple de conf :
 +* https://github.com/opencomputeproject/OpenNetworkLinux/blob/master/builds/any/rootfs/wheezy/common/overlay/etc/snmp/snmpd.conf
 +
 +
 +
 +
 +## Serveur
 +
 +### RedHat
 +
 +~~~bash
 +yum install net-snmp
 +~~~
 +
 +### Debian
 +
 +~~~bash
 +apt-get install snmpd snmptrapd snmp-mibs-downloader
 +~~~
 +
 +~~~bash
 +ln -s /usr/share/mibs/ /usr/share/snmp/mibs
 +~~~
 +
 +`/etc/default/snmptrapd`
 +~~~bash
 +#export MIBS=
 +export MIBS=ALL
 +export MIBDIRS=/usr/share/mibs
 +
 +#TRAPDRUN=no
 +TRAPDRUN=yes
 +
 +#TRAPDOPTS='-Lsd -p /run/snmptrapd.pid'
 +TRAPDOPTS='-On -Lsd -p /run/snmptrapd.pid'
 +~~~
 +
 +`/etc/snmp/snmp.conf`
 +~~~
 +#mibs :
 +~~~
 +
 +~~~bash
 +service snmpd restart
 +service snmptrapd restart
 +~~~
 +
 +
 +### Conf
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +#rocommunity public  localhost
 +rocommunity public  0.0.0.0/0
 +
 +#agentAddress  udp:127.0.0.1:161
 +#agentAddress udp:161,udp6:[::1]:161
 +agentAddress udp:161
 +
 +#includeAllDisks 1
 +skipNFSInHostResources 1
 +~~~
 +
 +#### Exemple conf 
 +
 +##### Exemple 1 - Conf Debian
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +agentAddress udp:161,udp6:[::1]:161
 +view   systemonly  included   .1.3.6.1.2.1.1
 +view   systemonly  included   .1.3.6.1.2.1.25.1
 +rocommunity public
 +rouser   authOnlyUser
 +sysLocation    Sitting on the Dock of the Bay
 +sysContact     Me <me@example.org>
 +sysServices    72
 +proc  mountd
 +proc  ntalkd    4
 +proc  sendmail 10 1
 +disk       /     10000
 +disk       /var  5%
 +includeAllDisks  10%
 +load   12 10 5
 +trapsink     localhost public
 +iquerySecName   internalUser
 +rouser          internalUser
 +defaultMonitors          yes
 +linkUpDownNotifications  yes
 +extend    test1   /bin/echo  Hello, world!
 +extend-sh test2   echo Hello, world! ; echo Hi there ; exit 35
 +master          agentx
 +smuxpeer .1.3.6.1.4.1.674.10892.1
 +~~~
 +
 +##### Exemple 2 - Conf RedHat
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +#com2sec notConfigUser  default       public
 +com2sec mynetwork 192.168.0.0/24      public
 +group   notConfigGroup v1           notConfigUser
 +group   notConfigGroup v2c           notConfigUser
 +view centreon included .1.3.6.1
 +view    systemview    included   .1.3.6.1.2.1.1
 +view    systemview    included   .1.3.6.1.2.1.25.1.1
 +access notConfigGroup "" any noauth exact centreon none none
 +access  notConfigGroup ""      any       noauth    exact  systemview none none
 +syslocation Unknown (edit /etc/snmp/snmpd.conf)
 +syscontact Root <root@localhost> (configure /etc/snmp/snmp.local.conf)
 +dontLogTCPWrappersConnects yes
 +~~~
 +
 +~~~bash
 +cat >> /etc/snmp/snmpd.conf <<EOF
 +view    systemview    included   .1.3.6.1
 +EOF
 +~~~
 +##### Exemple 3 - Debian 8
 +
 +Pour éviter bug timeout, car SNMP essaye de remonter les infos sur toutes les partitions qu'il trouve
 +~~~bash
 +systemctl disable mnt-espace_build.automount partage_install.automount partage_librairies.automount mnt-espace_build.mount partage_install.mount partage_librairies.mount
 +systemctl stop mnt-espace_build.automount partage_install.automount partage_librairies.automount mnt-espace_build.mount partage_install.mount partage_librairies.mount
 +~~~
 + 
 +Install du paquet **snmp-mibs-downloader** et de sa dépendance **smistrip**
 +~~~bash
 +dpkg -i smistrip_0.4.8+dfsg2-10_all.deb snmp-mibs-downloader_1.1_all.deb
 +~~~
 +
 +`/etc/default/snmpd`
 +~~~bash
 +export MIBS=ALL
 +SNMPDRUN=yes
 +SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux,mteTrigger,mteTriggerConf -p /run/snmpd.pid'
 +export MIBDIRS=/usr/share/mibs
 +~~~
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +agentAddress udp:161,udp6:[::1]:161
 +rocommunity public
 +~~~
 +
 +
 +##### Exemples droit d'accès
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +# rouser: a SNMPv3 read-write user
 +#   arguments:  user [noauth|auth|priv] [restriction_oid]
 +
 +rouser nagios auth
 +~~~
 +
 +Accès en lecture et écriture à la totalité de l'arborescence :
 +`/etc/snmp/snmpd.conf`
 +~~~
 +rwuser admin authpriv .1
 +~~~
 +
 +
 +### Pb - refused smux peer: oid SNMPv2-SMI::enterprises.674.10892.1, descr Systems Management SNMP MIB Plug-in Manager
 +
 +Voir : 
 +* https://help.onapp.com/hc/en-us/articles/222047348-Dell-Hypervisors-Error-refused-smux-peer-
 +* https://administratosphere.wordpress.com/2011/05/12/net-snmp-smux-fails-on-ubuntu-a-fix/
 +
 +~~~bash
 +systemctl status snmpd
 +● snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
 +   Loaded: loaded (/usr/lib/systemd/system/snmpd.service; enabled; vendor preset: disabled)
 +   Active: active (running) since mer. 2017-06-07 11:37:03 CEST; 9s ago
 + Main PID: 61127 (snmpd)
 +   CGroup: /system.slice/snmpd.service
 +           └─61127 /usr/sbin/snmpd -LS0-6d -f
 +
 +juin 07 11:37:03 8cc-offline-1 systemd[1]: Starting Simple Network Management Protocol (SNMP) Daemon....
 +juin 07 11:37:03 8cc-offline-1 snmpd[61127]: Turning on AgentX master support.
 +juin 07 11:37:03 8cc-offline-1 snmpd[61127]: NET-SNMP version 5.7.2
 +juin 07 11:37:03 8cc-offline-1 systemd[1]: Started Simple Network Management Protocol (SNMP) Daemon..
 +juin 07 11:37:06 8cc-offline-1 snmpd[61127]: refused smux peer: oid SNMPv2-SMI::enterprises.674.10892.1, descr Systems Management SNMP MIB Plug-in Manager
 +juin 07 11:37:09 8cc-offline-1 snmpd[61127]: refused smux peer: oid SNMPv2-SMI::enterprises.674.10892.1, descr Systems Management SNMP MIB Plug-in Manager
 +juin 07 11:37:12 8cc-offline-1 snmpd[61127]: refused smux peer: oid SNMPv2-SMI::enterprises.674.10892.1, descr Systems Management SNMP MIB Plug-in Manager
 +~~~
 +
 +#### Solution
 +
 +Solution 1
 +~~~bash
 +#echo "smuxpeer .1.3.6.1.4.1.674.10892.1 P@ssw0rd" >> /etc/snmp/snmpd.conf
 +echo "smuxpeer .1.3.6.1.4.1.674.10892.1" >> /etc/snmp/snmpd.conf
 +systemctl restart snmpd
 +~~~
 +
 +Solution 2
 +
 +`/etc/sysconfig/snmpd`
 +~~~bash
 +# snmpd command line options
 +# '-f' is implicitly added by snmpd systemd unit file
 +# OPTIONS="-LS0-6d"
 +OPTIONS="-I -smux"
 +~~~
 +
 +~~~bash
 +systemctl restart snmpd
 +~~~
 +
 +### Pleins de message "Connection from UDP" dans les logs 
 +
 +`/var/log/syslog`
 +~~~
 +Jul 18 01:08:07 plop snmpd[3232]: Connection from UDP: [192.168.15.27]:52799->[192.168.15.32]
 +Jul 18 01:08:34 plop snmpd[3232]: Connection from UDP: [192.168.15.22]:53386->[192.168.15.32]
 +~~~
 +
 +#### Solution
 +
 +Remplacer `-Lsd` par `-LSwd`
 +
 +`/etc/default/snmpd`
 +~~~ini
 +#SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'
 +SNMPDOPTS='-LSwd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'
 +~~~
 +
 +Ou 
 +
 +`/etc/sysconfig/snmpd`
 +~~~bash
 +#OPTIONS="-LS0-6d -Lf /dev/null -p /var/run/snmpd.pid"
 +OPTIONS="-LSwd -Lf /dev/null -p /var/run/snmpd.pid"
 +~~~
 +
 +ou 
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +dontLogTCPWrappersConnects yes
 +~~~
 +
 +puis restart du service
 +
 +
 +### Autres
 +
 +
 +`usmUser` a été créer après le redémarrage de SNMPd suite à la commande `createUser` (SNMPv3)
 +
 +Voir la commande `snmpusm`
 +
 +#### snmptranslate
 +
 +~~~
 +$ snmptranslate -M+. -m +ALL  -On  HOST-RESOURCES-MIB::hrProcessorTable
 +.1.3.6.1.2.1.25.3.3
 +
 +$ snmptranslate -Td .1.3.6.1.4.1.2021.11.52
 +UCD-SNMP-MIB::ssCpuRawSystem
 +...
 +    This object may sometimes be implemented as the
 +    combination of the 'ssCpuRawWait(54)' and
 +    'ssCpuRawKernel(55)' counters, so care must be
 +    taken when summing the overall raw counters."
 +~~~
 +
 +#### HP
 +
 +
 +Ajoutez la ligne suivante dans /etc/snmp/snmpd.conf :
 +
 +`/etc/snmp/snmpd.conf`
 +~~~
 +dlmod cmaX /usr/lib64/libcmaX64.so
 +~~~
 +
 +Redémarrez les services suivants :
 +~~~bash
 +systemctl restart hp-snmp-agents
 +systemctl restart snmpd
 +~~~
 +
 +
 +
 +
 +
 +
 +
 +
 +## Client
 +
 +Voir : 
 +* https://blog.cedrictemple.net/239-faire-des-requetes-snmp-en-ligne-de-commande-sous-linux
 +* https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-an-snmp-daemon-and-client-on-ubuntu-18-04-fr
 +
 +
 +
 +Use the `-On` option, according to `man snmpcmd`
 +
 +~~~bash
 +#snmpwalk -v2c -c public localhost
 +snmpwalk -v2c -On -c public localhost
 +~~~
 +
 +
 +
 +
 +
 +
 +### snmpwalk
 +
 +Voir aussi :
 +  * snmpgetnext
 +
 +Exemples :
 +~~~bash
 +# snmpwalk -t "$timeout" -r "$retries"
 +# '-Cc' Use this option to ignore number not increasing error
 +
 +snmpwalk -v2c -c public localhost system
 +#snmpwalk -v <laversion> -c <lacommunaute> <adresseip> <oid>
 +snmpwalk -v 2c -c public 192.168.1.13 1.3.6.1.2.1.2.2.1.10
 +
 +snmpwalk -v 3 -u usersnmp -a SHA -A 'MonMot2Passe!!' -x AES -X '!!MaPhrase2PasseAE' -l authPriv localhost
 +~~~
 +
 +
 +ATTENTION : ne faites JAMAIS une requête snmpwalk sur la racine de l’arbre SNMP ou sur un noeud de haut niveau. Si vous faites cela, vous allez saturer l’agent SNMP interrogé, le réseau et votre poste. Dans le passé, vous pouviez saturer certains agents SNMP et il était nécessaire de les redémarrer voire de redémarrer l’équipement. Ce pourrait être très gênant si vous deviez demander à l’équipe réseau de redémarrer un routeur.
 +~~~bash
 +# snmpwalk -v2c -c public 192.168.1.13
 +~~~
 +
 +Pour debug
 +~~~bash
 +snmpwalk -d -DAll
 +~~~
 +
 +
 +### snmpget
 +
 +~~~bash
 +#snmpget -v <laversion> -c <lacommunaute> <adresseip> <oid>
 +snmpget -v 2c -c public 192.168.1.13 1.3.6.1.2.1.2.2.1.10.1
 +
 +OID_STORAGE_DESC=.1.3.6.1.2.1.25.2.3.1.3
 +OID_STORAGE_SIZE=.1.3.6.1.2.1.25.2.3.1.5
 +OID_STORAGE_USED=.1.3.6.1.2.1.25.2.3.1.6
 +
 +snmpget -r 2 -v 3 -a MD5 -A "$PASSWD" -l authNoPriv -u nagios -Oqv localhost $OID_STORAGE_DESC.${indice}
 +snmpget -r 2 -v 3 -a MD5 -A "$PASSWD" -l authNoPriv -u nagios -Oqv localhost $OID_STORAGE_SIZE.${indice}
 +snmpget -r 2 -v 3 -a MD5 -A "$PASSWD" -l authNoPriv -u nagios -Oqv localhost $OID_STORAGE_USED.${indice}
 +~~~
 +
 +
 +### Nagios check_snmp
 +
 +Exemple de supervision de ports sur un switch
 +
 +`/usr/local/nagios/etc/objects/commands.cfg`
 +~~~c
 +define command{
 +        command_name    check_port_com
 +        command_line    $USER1$/check_snmp -H $HOSTADDRESS$ -P3 -L authNoPriv -a MD5 -U $USER3$ -A "$USER4$" -c 1,1 -o IF-MIB::ifOperStatus.$ARG1$
 +        }
 +~~~
 +
 +
 +`switch.cfg`
 +~~~c
 +define service{
 + use generic-service ; Inherit values from a template
 + host_name linksys-srw224p
 + service_description Port 1 Link Status
 + check_command check_snmp!-C public -o ifOperStatus.1 -r 1 -m RFC1213-MIB
 + }
 +
 +~~~
 +
 +`/usr/local/nagios/etc/objects/switch.cfg`
 +~~~c
 +define service{
 +        use                     EtatPortCom
 +        hostgroup_name          RouteurSwitchs
 +        service_description     EtatPortCom1
 +        check_command           check_port_com!1
 +        #event_handler           trigger_etatport!1
 +    }
 +~~~
 +
 +
 +
 +### Lister les utilisateurs SNMPv3
 +
 +~~~bash
 +snmpwalk .1.3.6.1.6.3.15.1.2.2.1.3
 +~~~
 +
 +
 +### Ajout d'une MIB
 +
 +Voir : https://github.com/simonjj/SnmpMibs
 +
 +Logs Zabbix
 +~~~
 +MIB search path: /root/.snmp/mibs:/usr/share/snmp/mibs:/usr/share/snmp/mibs/iana:/usr/share/snmp/mibs/ietf:/usr/share/mibs/site:/usr/share/snmp/mibs:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/netsnmp
 +Cannot find module (DISMAN-EVENT-MIB): At line 1 in (none)
 +~~~
 +
 +~~~bash
 +apt-get install snmp-mibs-downloader
 +~~~
 +
 +La MIB sera installée ici : `/var/lib/snmp/mibs/ietf/DISMAN-EVENT-MIB`
 +
 +Commenter **mibs :**
 +
 +`/etc/snmp/snmp.conf`
 +~~~
 +#mibs :
 +~~~
 +
 +~~~bash
 +snmptranslate -Tp
 +~~~
 +
 +Pour **DISMAN-EVENT-MIB** le pb est résolu
 +
 +Mais il reste **CPQRACK-MIB** et **CPQIDA-MIB**
 +~~~
 +Cannot find module (CPQRACK-MIB): At line 1 in (none)
 +Cannot find module (CPQIDA-MIB): At line 1 in (none)
 +~~~
 +
 +~~~bash
 +git clone https://github.com/simonjj/SnmpMibs
 +cd SnmpMibs
 +cp CPQ* /usr/share/snmp/mibs/
 +chmod a+r /usr/share/snmp/mibs/CPQ*
 +~~~
 +
 +
 +#### Notes
 +
 +~~~
 +snmpget -t 1 -r 5 -M /usr/local/share/snmp/mibs -v 1 -c public 159.217.18.10:161 cpqRackCommonEnclosureTemp
 +tcpdump -i any -s 0 host hp-array-1.0 and port 161 -n
 +~~~
 +
 +
 +
 +### snmpcheck
 +
 +Il existe l'ancienne version écrit en Perl et une plus récente écrit en Ruby
 +
 +Il ne faut pas confondre la commande snmpcheck de Debian (paquet **[[http://net-snmp.sourceforge.net/|snmp]]**) avec la snmpcheck de http://www.nothink.org/codes/snmpcheck
 +
 +Debian
 +~~~bash
 +apt-get install ruby-snmp
 +~~~
 +
 +RedHat
 +~~~bash
 +yum install ruby
 +gem install snmp
 +~~~
 +
 +~~~bash
 +wget http://www.nothink.org/codes/snmpcheck/snmpcheck-1.9.rb
 +chmod +x snmpcheck-1.9.rb
 +./snmpcheck.rb
 +~~~
 +
 +~~~bash
 +nmap -sS 192.168.56.21
 +snmpcheck -h 
 +snmpcheck -t 192.168.56.21
 +~~~
 +
 +### qtmib
 +
 +
 +
 +GUI SNMP MIB Browser for Linux platforms
 +Liens : https://sourceforge.net/projects/qtmib/
 +
 +The program comes with a large number of MIBs pre-installed, anything from Cisco’s and Juniper’s to HP’s and Dell’s. You can also install your own MIBs by copying them into ~/.config/qtmib/mibs directory.
 +
 +
  
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