[SNMP4J] Trap Messages using SampleAgent from the network not working

[Kazantsev, Andrey V.]

>This is the part I'm not sure I understand. Correct me if I'm wrong, my
>understanding is let's say PC 1 (agent) generates a trap. The trap is caused
>by let's say a hardware malfunction. Shouldn't the trap message originate
>from PC 1 and not PC 2 because PC 1 has the failing hardware and the agent
>should simply report it to PC 2? That is, PC 2 is the trap receiver
>listening on port 162?

It's my mistake, just swap agent and monitor. But as I understand, this doesn't matter.

> Address address = GenericAddress.parse("udp:255.255.255.255/162");

Here you use broadcast address, it's better to specify monitor address (192.168.x.x).

> My idea is you deploy the
agent and the agent doesn't care who monitors it. With this approach, the
agent has to know who monitors it.

But how agent will know where to send trap messages ? Sending traps to broadcast is not a good idea.

I don't know what "((SnmpTargetAddrEntryRow)addr).getAddress()" is, but I think you can look at source code deeper.

-----Original Message-----
From: Ver Allan N. Sumabat [mailto:allan.sumabat at aatitechnologies.com] 
Sent: Sunday, July 25, 2010 17:46
To: Kazantsev, Andrey V.
Cc: snmp4j at agentpp.org
Subject: RE: [SNMP4J] Trap Messages using SampleAgent from the network not working

I have seen the problem. I changed this part of code in
NotificationOriginatorImpl line 173:

Address address = ((SnmpTargetAddrEntryRow)addr).getAddress();

to this:

Address address = GenericAddress.parse("udp:255.255.255.255/162");

I'm now receiving traps on PC 2.

My questions are:

1. Is this the correct approach? That is, I have to specify on the agent
side the ip address of the monitor ip address? My idea is you deploy the
agent and the agent doesn't care who monitors it. With this approach, the
agent has to know who monitors it.

2. I haven't looked deeper but where is the address of this code
"((SnmpTargetAddrEntryRow)addr).getAddress()" being stored 'cause as I see
it, it always returns 127.0.0.1 which is only useful for development and not
for production?

Thanks and best regards,
Allan


-----Original Message-----
From: snmp4j-bounces at agentpp.org [mailto:snmp4j-bounces at agentpp.org] On
Behalf Of Ver Allan N. Sumabat
Sent: Friday, July 23, 2010 7:13 PM
To: 'Kazantsev, Andrey V.'
Cc: snmp4j at agentpp.org
Subject: Re: [SNMP4J] Trap Messages using SampleAgent from the network not
working

This is the part I'm not sure I understand. Correct me if I'm wrong, my
understanding is let's say PC 1 (agent) generates a trap. The trap is caused
by let's say a hardware malfunction. Shouldn't the trap message originate
from PC 1 and not PC 2 because PC 1 has the failing hardware and the agent
should simply report it to PC 2? That is, PC 2 is the trap receiver
listening on port 162?


-----Original Message-----
From: Kazantsev, Andrey V. [mailto:kazantsev at axmor.com] 
Sent: Friday, July 23, 2010 6:52 PM
To: Ver Allan N. Sumabat
Cc: snmp4j at agentpp.org
Subject: RE: [SNMP4J] Trap Messages using SampleAgent from the network not
working

Are you sure that snmp agent listens on address that is accessible for snmp
monitor? I.e., PC 1 (agent) address is 192.168.1.1 and PC 2 (monitor)
address is 192.168.1.2. Snmp agent should listen on 192.168.1.1:161, while
snmp monitor should send notifications to 192.168.1.1:161 (using its
192.168.1.2 interface).

If this is ok - check network connection between these two PCs, maybe there
is a firewall on PC 1 that is blocking 161 port?

If you work on linux, you can also use tcpdump to see what is going on
network.

-----Original Message-----
From: Ver Allan N. Sumabat [mailto:allan.sumabat at aatitechnologies.com] 
Sent: Friday, July 23, 2010 17:44
To: Kazantsev, Andrey V.
Cc: snmp4j at agentpp.org
Subject: RE: [SNMP4J] Trap Messages using SampleAgent from the network not
working

The thing is the traps and informs are received locally meaning on
127.0.0.1. When I use another machine to receive the traps, I cannot receive
them. Let me elaborate further:

Case 1:

PC 1 - has snmp agent (SampleAgent from snmp4j source), has snmp monitor
-----------------------
result: traps are received by PC 1.


Case 2:

PC 1 - has snmp agent (snmp4j agent)
PC 2 - has snmp monitor
-----------------------
Result: no traps received by PC 2


Btw, I didn't change anything in the SampleAgent source to make it run.


-----Original Message-----
From: Kazantsev, Andrey V. [mailto:kazantsev at axmor.com] 
Sent: Friday, July 23, 2010 5:30 PM
To: Ver Allan N. Sumabat
Cc: snmp4j at agentpp.org
Subject: RE: [SNMP4J] Trap Messages using SampleAgent from the network not
working

Hi,

By default traps and informs use port 162, maybe be this is the cause of
problem?

-----Original Message-----
From: snmp4j-bounces at agentpp.org [mailto:snmp4j-bounces at agentpp.org] On
Behalf Of Ver Allan N. Sumabat
Sent: Friday, July 23, 2010 16:09
To: snmp4j at agentpp.org
Subject: [SNMP4J] Trap Messages using SampleAgent from the network not
working

Hi List,

 

I'm having a problem trying to get trap messages over the network using the
SampleAgent class. I tried starting it with the following argument:
udp:127.0.0.1/161

 

Using the iReasoning MIBBrowser personal edition, I can receive trap
messages locally. When I use another pc as snmp monitor, I could no longer
receive those trap messages.

 

I tried changing the program argument to udp:192.168.x.x/161 which is the ip
address of the pc running the agent but still same result.

 

Any ideas?

 

Thanks,

Allan

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