[mrtg] Re: mrtg and snmp on linux redhat 9

[Tim Reimers]

I'm assuming that your SNMP string really __isn't__ 'public'
If not, and it has any strange characters in it, the snmpwalk command's
-c switch will need those 'escaped'

Like so:

If your SNMP string was 'vet$rwt'
then to use snmpwalk you'd have to do

snmpwalk -v 2c -c vet\$rwt hostname OID

Another possibility of a failed snmpwalk is using the wrong version-

try 'snmpwalk -v 1 -c <commstr> <hostname> <OID>'

I've encountered devices that support only SNMP version 1, OR SNMP
version 2c, etc...

One last idea-

Set up SNMP on something like a JetDirect on your same IP subnetwork
(not across a router/WAN/VLAN link)

Just set it to 'public' or something common-

Now try walking that-
[root at acslinux root]# snmpwalk -v 1 -c xxxxxx
itslj4m                                                            
SNMPv2-MIB::sysDescr.0 = STRING: HP ETHERNET MULTI-ENVIRONMENT,ROM
H.07.15,JETDIRECT EX,JD34,EEPROM H.08.49
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.11.2.3.9.1


Tim


Roman wrote:
> 
> hi there
> I am really not able to run mrtg under redhat 9.
> 
> I have already tried this:
> 1.
> - download newest mrtg (2.10.13) / configure /install / start snmpd
> - cfgmaker could not run because of 'no response received' from SNMP server....
> then I tried to install net-snmp newer version (5.0.9)
> but cfgmaker could not run with it, too.
> 
> 2. after this I have returned back to original RH 9 packages of SNMP(5.0.6) and mrtg(2.9.17-13) but result was very similar:
> ---------------------------- start -----------------------------
> /usr/bin/cfgmaker --global 'WorkDir: /www/mrtg/data' --global 'Options[_]: bits,growright' --output /etc/mrtg/mrtg.cfg public at fresange
> --base: Get Device Info on public at fresange:
> SNMP Error:
> no response received
> SNMPv1_Session (remote host: "fresange" [127.0.0.1].161)
>                   community: "public"
>                  request ID: 1907357759
>                 PDU bufsize: 8000 bytes
>                     timeout: 2s
>                     retries: 5
>                     backoff: 1)
>  at /usr/bin/../lib/mrtg2/SNMP_util.pm line 450
> SNMPGET Problem for sysDescr sysContact sysName sysLocation sysObjectID on public at fresange:
>  at /usr/bin/cfgmaker line 657
> --base: Vendor Id:
> --base: Populating confcache
> --snpo: Skipping ifDescr scanning because public at fresange: does not seem to support it
> --snpo: Skipping ipAdEntIfIndex scanning because public at fresange: does not seem to support it
> --snpo: Skipping ifName scanning because public at fresange: does not seem to support it
> --snpo: Skipping ifType scanning because public at fresange: does not seem to support it
> --snpo: Skipping ifPhysAddress scanning because public at fresange: does not seem to support it
> --base: Get Interface Info
>  .....
> ------------------------------- end -------------------------
> 
> I suppose there is some problem with snmpd - here is the response to snmpwalk:
> 
> prompt> /usr/bin/snmpwalk -v 2c -c public fresange
> Timeout: No Response from fresange
> 
> but I don't know how to resolve it.
> 
> Any suggestions will be welcomed.
> 
> Thanks
> 
> HRom
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