[mrtg] Re: SMTP on TCP port

[Chris Wilson]

Hi,

Sorry, I have already turned it off.  We're all behind a firewall and
never built any rules for it.

Chris

Derek Winkler wrote:
> Sounds like a firewall problem.
> Turn off ipchains/iptables and try again.
> 
> -----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 11:08 AM
> To: Peter P. Benac
> Cc: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Re: SMTP on TCP port
> 
> 
> 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
>>Need quick reliable Systems or Network Management advice visit
>>http://www.nmsusers.org
>>
>>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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-- 
---
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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