[mrtg] Mrtg 2.15.0, cfgmaker and SNMP v3 - help

[Ed LaFrance]

Hello -

I'm having fits trying to get mrtg 2.15.0 to run against my 
linux-based router using mrtg v3. I can poll the router using v1 with 
no problem, but in v3 I get no joy. The router OS does support v3.

I set an engineid on the router (it's user-defined) as a ten-digit 
hex string "0x0102030405". Then I set the community I'm polling on 
the router as follows:

                       name: public
                     address: <monitoring station IP>
                    security: private
                 read-access: yes
                write-access: no
     authentication-password: <authpwd>
         encryption-password: <cryptpwd>
     authentication-protocol: MD5
         encryption-protocol: DES

I was then able to successfully snmpwalk the router with the following command:

snmpwalk -u public -v 3 -a MD5 -A <authpwd> -l authPriv -x DES -X 
<cryptpwd> <router.ip>

So I made sure that I had Net::SNMP and all dependencies installed, 
then ran this command to generate a cfg file for the router:

/usr/local/mrtg-2/bin/cfgmaker --global 'Workdir: /path/to/workdir' 
--global 'Options[_]: bits, growright' --ifref=descr --output 
/path/to/output.cfg --enablesnmpv3 --username=public 
--authprotocol=MD5 --authpassword=foobarme --privprotocol=des 
--privpassword=foobarme --contextengineid=0x0102030405 
--snmp-options=:::::3 <router.ip>



This is what I see on the command line as the result of that command:

--base: SNMP V3 libraries found, SNMP V3 enabled.
--base: Get Device Info on public@<router.ip>
--base: Writing /path/to/output.cfg



When I open output.cfg, this is all that's in there:

# Created by
# /usr/local/mrtg-2/bin/cfgmaker --global 'Workdir: /path/to/workdir' 
--global 'Options[_]: bits, growright' --ifref=descr --output 
/path/to/output.cfg --enablesnmpv3 --username=public 
--authprotocol=MD5 --authpassword=foobarme --privprotocol=des 
--privpassword=foobarme --contextengineid=0x0102030405 
--snmp-options=:::::3 <router.ip>


### Global Config Options

#  for UNIX
# WorkDir: /home/http/mrtg

#  or for NT
# WorkDir: c:\mrtgdata

### Global Defaults

#  to get bits instead of bytes and graphs growing to the right
# Options[_]: growright, bits

EnableIPv6: no
Workdir: /path/to/workdir
Options[_]: bits, growright

######################################################################
# System:
# Description:
# Contact:
# Location:
######################################################################


enablesnmpv3: yes


That's it. If I run cfgmaker with my usual snmp v1 commands, it works 
fine and I get a properly populated file. Any idea what is wrong?

Thanks!
Ed