Hi all, I am a newbie to SNMP and its configuration, so my apologies for asking a question that might have a very simple answer. However, I have been searching on the internet for some time now, and I just cannot figure out what I am doing wrong.
Context: I have an HP Color Laser Jet Printer which is connected by ethernet (port 1) to a Device running Ubuntu 16.04 and having two ethernet ports. From my Windows (10) laptop, which is connected to port 2 of the Linux Device, I want to have SNMP connection with the printer. For example, I want to be able to ask the OID 1.3.6.1.2.1.25.3.5.1.1.1 (hrPrinterStatus.1) from the HP printer (having Static IP 190.168.6.132) by just sending a SNMP request to my Linux Device (having IP 190.168.6.133 on port 1 and IP 190.168.6.134 on port 2). What I did: I setup as wel as an agent as an manager (manager was unnecessary) on the Linux Device as specified here: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-an-snmp-daemon-and-client-on-ubuntu-14-04 As far as I know, this can simply be solved by using a proxy. This is why I added the line proxy -v 2c -c public 192.168.6.132 .1.3 to my snmpd.conf file. However, when I do a snmp request from my laptop, to my Linux Device. I get "No Such Instance currently exists at this OID" / Agent response reported an Error Status of NoSuchName. Apparently my SNMP request still looks for the OID at my Linux Device, which isn't a Printer and therefore does not have the OID I am asking for. Question: I am able to do SNMP requests from my Laptop to my Linux Device, and from my Linux Device to my Printer. However, I want the Linux device to just forward the requests to my Printer. I do not want any SNMP requests for asking OIDs from my Linux Device itself, only the Printer. Preferably I would like to just use the 'public' community. Can anybody help me out? Below you can find my current snmpd.conf file (also in attachment) Thank you in advance! Best regards, Kevin snmpd.conf: ############################################################################### # # EXAMPLE.conf: # An example configuration file for configuring the Net-SNMP agent ('snmpd') # See the 'snmpd.conf(5)' man page for details # # Some entries are deliberately commented out, and will need to be explicitly activated # ############################################################################### # # AGENT BEHAVIOUR # # Listen for connections from the local system only #agentAddress udp:127.0.0.1:161 # Listen for connections on all interfaces (both IPv4 *and* IPv6) agentAddress udp:161,udp6:[::1]:161 ############################################################################### # # SNMPv3 AUTHENTICATION # # Note that these particular settings don't actually belong here. # They should be copied to the file /var/lib/snmp/snmpd.conf # and the passwords changed, before being uncommented in that file *only*. # Then restart the agent # createUser authOnlyUser MD5 "remember to change this password" # createUser authPrivUser SHA "remember to change this one too" DES # createUser internalUser MD5 "this is only ever used internally, but still change the password" #createUser bootstrap MD5 temp_password DES # If you also change the usernames (which might be sensible), # then remember to update the other occurances in this example config file to match. ############################################################################### # # ACCESS CONTROL # # system + hrSystem groups only ###view systemonly included .1.3.6.1.2.1.1 ###view systemonly included .1.3.6.1.2.1.25.1 view all included .1 # Full access from the local host #rocommunity public localhost # Default access to basic system info ### rocommunity public default -V systemonly rocommunity public # rocommunity6 is for IPv6 rocommunity6 public default -V systemonly # Full access from an example network # Adjust this network address to match your local # settings, change the community string, # and check the 'agentAddress' setting above #rocommunity secret 10.0.0.0/16 # Full read-only access for SNMPv3 rouser authOnlyUser # Full write access for encrypted requests # Remember to activate the 'createUser' lines above #rwuser authPrivUser priv #rwuser bootstrap priv rwuser demo priv # It's no longer typically necessary to use the full 'com2sec/group/access' configuration # r[ow]user and r[ow]community, together with suitable views, should cover most requirements ############################################################################### # # SYSTEM INFORMATION # # Note that setting these values here, results in the corresponding MIB objects being 'read-only' # See snmpd.conf(5) for more details #sysLocation Sitting on the Dock of the Bay sysContact Me <m...@example.org> # Application + End-to-End layers sysServices 72 # # Process Monitoring # # At least one 'mountd' process proc mountd # No more than 4 'ntalkd' processes - 0 is OK proc ntalkd 4 # At least one 'sendmail' process, but no more than 10 proc sendmail 10 1 # Walk the UCD-SNMP-MIB::prTable to see the resulting output # Note that this table will be empty if there are no "proc" entries in the snmpd.conf file # # Disk Monitoring # # 10MBs required on root disk, 5% free on /var, 10% free on all other disks disk / 10000 disk /var 5% includeAllDisks 10% # Walk the UCD-SNMP-MIB::dskTable to see the resulting output # Note that this table will be empty if there are no "disk" entries in the snmpd.conf file # # System Load # # Unacceptable 1-, 5-, and 15-minute load averages load 12 10 5 # Walk the UCD-SNMP-MIB::laTable to see the resulting output # Note that this table *will* be populated, even without a "load" entry in the snmpd.conf file ############################################################################### # # ACTIVE MONITORING # # send SNMPv1 traps trapsink localhost public # send SNMPv2c traps #trap2sink localhost public # send SNMPv2c INFORMs #informsink localhost public # Note that you typically only want *one* of these three lines # Uncommenting two (or all three) will result in multiple copies of each notification. # # Event MIB - automatically generate alerts # # Remember to activate the 'createUser' lines above iquerySecName internalUser rouser internalUser # generate traps on UCD error conditions defaultMonitors yes # generate traps on linkUp/Down linkUpDownNotifications yes ############################################################################### # # EXTENDING THE AGENT # # # Arbitrary extension commands # extend test1 /bin/echo Hello, world! extend-sh test2 echo Hello, world! ; echo Hi there ; exit 35 #extend-sh test3 /bin/sh /tmp/shtest # Note that this last entry requires the script '/tmp/shtest' to be created first, # containing the same three shell commands, before the line is uncommented # Walk the NET-SNMP-EXTEND-MIB tables (nsExtendConfigTable, nsExtendOutput1Table # and nsExtendOutput2Table) to see the resulting output # Note that the "extend" directive supercedes the previous "exec" and "sh" directives # However, walking the UCD-SNMP-MIB::extTable should still returns the same output, # as well as the fuller results in the above tables. # # "Pass-through" MIB extension command # #pass .1.3.6.1.4.1.8072.2.255 /bin/sh PREFIX/local/passtest #pass .1.3.6.1.4.1.8072.2.255 /usr/bin/perl PREFIX/local/passtest.pl # Note that this requires one of the two 'passtest' scripts to be installed first, # before the appropriate line is uncommented. # These scripts can be found in the 'local' directory of the source distribution, # and are not installed automatically. # Walk the NET-SNMP-PASS-MIB::netSnmpPassExamples subtree to see the resulting output # # AgentX Sub-agents # # Run as an AgentX master agent master agentx # Listen for network connections (from localhost) # rather than the default named socket /var/agentx/master #agentXSocket tcp:localhost:705 proxy -v 2c -c public 192.168.6.132 .1.3
snmpd.conf
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