[mrtg] Re: SMTP on TCP port

[Chris Wilson]

Hi,

Sorry, I think my terminology is incorrect.

The problem is that, when I start net-snmp, informing it to use UDP port 
161, I can SNMP walk it locally (on the remote and local ip addresses), 
but when I try remotely it fails to work.

Then I repeat the process, telling it to use TCP port 161 it works fine, 
remotely and locally.

I know this is a problem with either redhat doing funny things, or 
indeed net-snmp I was basically looking for a way of using TCP to avoid 
having to fix that :)

Chris

Peter P. Benac wrote:
> Chris,
> 
>     I'd be more interested in what kind of errors you are having binding to
> UDP port 161 and why you are trying to bind to port 161?  You don't need to
> bind to port 161 unless you are writing an SNMP agent.  Furthermore Redhat's
> SNMP agents will bind to this port during the startup process and this will
> block any additional software from binding to that port.
> 
>     You need to do snmpget's and snmp writes TO port 161 on the devices you
> are trying to manage.  This does not require you bind to any port on the
> system you are running your SNMP software on.  To extract data from a device
> all you need to do is open a socket with the DISTINATION port set to 161 and
> not the SOURCE port. SNMP Agents don't really care what port sources the
> request to it's port 161.
> 
> Regards,
> Pete
> ----
> Peter P. Benac, CCNA
> Emacolet Networking Services, Inc
> Providing Systems and Network Consulting, Training, Web Hosting Services
> Phone: 919-847-1740 or 866-701-2345
> Web: http://www.emacolet.com
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> 
> To have principles...
>              First have courage.. With principles comes integrity!!!
> 
> 
> 
>>-----Original Message-----
>>From: mrtg-bounce at list.ee.ethz.ch 
>>[mailto:mrtg-bounce at list.ee.ethz.ch] On Behalf Of Chris Wilson
>>Sent: Wednesday, November 26, 2003 6:03
>>To: Vincent De Keyzer
>>Cc: mrtg at list.ee.ethz.ch
>>Subject: [mrtg] Re: SMTP on TCP port
>>
>>
>>Hi,
>>
>>I was having immence problem binding net-snmp to a udp port, it just 
>>wouldn't go.  I tried evcerything I could think of, however it worked 
>>first time on TCP (so it wasn't the config file!).
>>
>>I could properly walk it etc.
>>
>>Therefore I thought that if MRTG could access TCP ports then it would 
>>mean that I didn't have to contine battleing against funny 
>>things that 
>>redhat has probably done to its system.
>>
>>Cheers,
>>
>>Chris
>>
>>Vincent De Keyzer wrote:
>>
>>>Chris,
>>>
>>>Afaik SNMP works on UDP only.
>>>
>>>Why would you want to do this?
>>>
>>>Vincent
> 
>  
> 
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-- 
---
Chris Wilson
Sigmer Technologies Ltd
The Sussex Innovation Centre
Science Park Square, Falmer
Brighton, East Sussex, BN1 9SB
www.sigmer.com
chris at sigmer.com

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