Hi,
I’ve configured proxy directive in snmpd.conf file and tested successfully.
It’s working great. Thanks a lot. But I’ve an issue.
I configured net-snmp listening on port 161 to proxy requests for all OIDs
(.1.3) as below expecting it to proxy all requests to legacy agent
listening on port 1661, then I found that net-snmp passes requests for only
such OIDs as Private MIBs implemented in legacy agent, however fails for
standard MIB-II implementation in which case net-snmp obtains MIB data from
it’s snmpd (161).
In other words, I observed, for MIBs having implemented
in both master-agent (snmpd) and sub-agent (legacy agent), master-agent
implementation supersedes and the below proxy directive might fail to proxy
request for such OIDs to port 1661.
proxy -v 2c -c public
localhost:1661 .1.3
Just to test further, I’ve configured snmpd.conf as below
proxy -v 2c -c public localhost:1661 .1.3
proxy -v 2c -c public localhost:1661 .1.3.6.1.2.1.2.2.1.2.1 (ifDescr.1)
proxy -v 2c -c public localhost:1661 .1.3.6.1.2.1.2.2.1.2.2 (ifDescr.2)
In this case, proxy request for “IfDescr.1” to port 1661 succeeded when I
tried to retrieve a single MIB data. I’ve tested this proxy directive
specifying complete OID for various IF-MIB OIDs and its works fine when I
tried to retreive a single IF-MIB data but fails when I walk through
complete IF-MIB table.
Do I need to configure proxy for all individual OIDS for all MIBs
implemented in net-snmp agent?
Case 1: Request ifTable to legacy agent: success
# snmpwalk -v 2c -c public 172.13.5.24:1661 .1.3.6.1.2.1.2 (ifTable)
|
|
IF-MIB::ifDescr.1 = STRING:
Internal TCP Software Loopback Interface;
IF-MIB::ifDescr.2 = STRING: Broadcom Embedded Gigabit Ethernet Controller,
10/100/1000 Mbps, RJ45;
|
|
Case 2: Request single MIB to net-snmp agent: success
# snmpget -v 2c -c public 172.13.5.24 .1.3.6.1.2.1.2.2.1.2.1
IF-MIB::ifDescr.1 = STRING: Internal TCP Software Loopback Interface;
# snmpget -v 2c -c public 172.13.5.24 .1.3.6.1.2.1.2.2.1.2.2
IF-MIB::ifDescr.2 = STRING: Broadcom Embedded Gigabit Ethernet Controller,
10/100/1000 Mbps, RJ45;
Case 3: Request ifTable MIB to net-snmp agent: failed
# snmpwalk -v 2c -c public 172.13.5.24 .1.3.6.1.2.1.2 (ifTable)
|
|
net-snmp MIB
data....
|
IF-MIB::ifDescr.2 = STRING: Broadcom Embedded Gigabit Ethernet Controller,
10/100/1000 Mbps, RJ45;
|
|
Could you please tell me how proxy support succeeds in case 2 but fails in
case 3?
Thanks in advance,
KrishnaMohan
--- On Tue, 23/6/09, Dave Shield <d.t.shi...@liverpool.ac.uk> wrote:
From: Dave Shield <d.t.shi...@liverpool.ac.uk>
Subject: Re: How to run my legacy snmp "agent" as sub-agent of net-snmp agent
To: "Krishna Mohan" <gkmoha...@yahoo.co.in>
Cc: "net-snmp-users" <net-snmp-users@lists.sourceforge.net>
Date: Tuesday, 23 June, 2009, 7:42 PM
2009/6/23 Krishna Mohan <gkmoha...@yahoo.co.in>:
> On my host I’m using legacy snmp (internally developed by our team) which
> lacks IPv6 functionality. In order to circumvent this, I’d like to use
> net-snmp agent which supports IPv6 and adding new MIBs at ease. Could you
> please let me know how to run my legacy snmp as sub-agent of net-snmp agent?
See the 'snmpd.conf' man page - in particular the "proxy" directive.
> Would running legacy snmp as sub-agent of net-snmp agent require any code
> changes in my code?
As long as you can configure the legacy agent to listen on a different port,
then no code changes should be needed.
> Or could it be done with configuring net-snmp agent? If
> so, please suggest me the approach.
Use "proxy" to pass selected requests on to the legacy agent.
Dave
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