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How to Install SNMP on SCO 3.2v4.2 and OSR5

© September 2000 Jeff Liebermann

by Jeff Liebermann (jeffl@comix.santa-cruz.ca.us)
Latest version at: Jeff's site

1.  Run:
        mkdev snmp

2.  Edit: /etc/snmpd.conf
This is mine.  Do NOT change the descr and objid fields.
    descr=SCO TCP/IP Runtime Release 2.0.0
    contact=Jeff Liebermann
    location=Comix World Headquarters

3.  Edit: /etc/snmpd.comm
Comment out or remove any lines with WRITE permission.
The default community name is "public".  This is mine:
    # test1        READ
    # test2      WRITE
    public        READ
Public is a password.  If security is an issue, pick a
different community name (password) and set the IP address
for the local host ( only as in:
    secret      READ
so that only MIB browser running on the local machine
can read SNMP parameters.  Using the local machine
IP address will also work.

4.  Edit: /etc/snmpd.peers
The SCO supplied configuration hostmib OID is wrong.
(Actually, the OID is correct, but the MIB is compiled
with the wrong OID.  Therefore, the hostmib line must
be tweaked to compensate.  See the corrected hostmib
OID line below.  This is mine:

    # "unixd"  "aintNoThing"
    # "triald" "aintNoThing"
    # "gated" "aintNoThing"
    # "foosmuxd" "mypasswd"
    "scoDoctorMIB" "mypasswd"
    ####"hostmib" "aintNoThing" 
    "hostmib"     "aintNoThing" 

The first 4ea lines don't do anything.  Only the last
hostmib line is really necessary.  Note the change in
OID number.  The SCO supplied ...32.99.1 is wrong.

5.  Edit: /etc/snmpd.trap
No traps should be set at this time.

6.  Verify that SNMP is working with:
        getmany localhost public iso
which belches everything in the tree.  When the hostmib
is grafted onto the tree, the list will grow substantially.

7.  Run:
        mkdev hostmib
Select install.  Verify that the line:
        /etc/smuxtcl /etc/sysadm.d/hostmib.tcl
is in the process table with:
        ps -ef | grep smux

8.  Create a table of object names to mib numbers with:
        cd /etc/sysadm.d
        post_mosy -i hostmib.defs -o hostmib.dfn
The hostmib.dfn file was missing from the SCO SNMP
distributions and is required for the  getone  and  getmany
commands to belch descriptive names instead of cryptic
numeric only OID's.

8.  Shutdown and restart networking with:
        /etc/rc2.d/S89hostmib stop      # stop smux hostmib
        ps -e | grep snmpd              # get PID for snmpd
                1176  ?  00:11  snmpd   # typical ps -e output line
        kill -1 1176                    # tell snmpd to re-read config files.
        /etc/rc2.d/S89hostmib start     # restart smux hostmib

9.  Test with:
  getone -f  /etc/sysadm.d/hostmib.dfn sloth public mib-
  getone -f  /etc/sysadm.d/hostmib.dfn sloth public
  getmany -f /etc/sysadm.d/hostmib.dfn sloth public hrSystemProcesses
  getone -f  /etc/sysadm.d/hostmib.dfn sloth public hrSystemProcesses.0
These should all identically return the number of processes currently
being run.  (Why doesn't smuxtcl program read the text definitions
into memory like the RFC1155-SMI stuff?)  Sloth is the name of my
test machine.  SNMP status is displayed with:
        /usr/bin/snmpstat -s sloth

10.  Bugs:  The SNMP "getmany" program has a bug in its
inability to handle long OID's.  My guess is that the super
long NT OID's below are overrunning a fixed length buffer of
insufficient length.  The following was run on 3.2v4.2 with
tcp/ip 1.2.1 with net382e.  The exact same problem appears
with getmany on 3.2v5.0.0, 3.2v5.0.2, and 3.2v5.0.4.

The target machine (bloat) is an NT4.0 SP3 server.  The
equivalent mib walker command under Linux 2.0.30 (snmpwalk)
from CMU_SNMP works fine so it's not NT that's causing this
problem.  According to "The Simple Book" by Marshall Rose,
the maximum length for an OID is 128 fields which is far more
than "getmany" will apparently tolerate.

# getmany nt4server public iso

Name: enterprises.
Value: Gateway Service for NetWare

Name: enterprises.
Value: Remote Access Autodial Manager
Memory fault(coredump)

11.  For displaying SNMP derived values, I recomment MRTG
(Mutli Router Traffic Grapher) at:
It compiles and runs nicely under 3.2v4.2 and 3.2v5.0.x.
There are numerous examples of the output all over the web.
© Jeff Liebermann (jeffl@comix.santa-cruz.ca.us) All rights reserved

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