Re: snmptrap to localhost

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Don t really know what a "local box" is...
nor a "trap receiver"...
could you please be more clear?

Daniel Coelho


On 5/22/07, Dave Shield <D.T.Shield@csc.liv.ac.uk> wrote:
>
> On 22/05/07, Daniel Coelho <danicoelho7@gmail.com> wrote:
> > When I do
> > snmptrap -v 1 -c public localhost '' 0 0 '' coldStart.0
> > or
> > snmptrap -v 1 -c public 127.0.0.1 '' 0 0 '' coldStart.0
> > or
> > snmptrap -v 1 -c public 172.18.50.103 '' 0 0 '' coldStart.0
> > I get nothing with tcpdump. ( 172.18.50.103 being my IP)
>
>
> If you are sending traffic to the local machine, it will probably
> use the loopback interface, and never actually appear on
> the network at all. I suspect that tcpdump is monitoring
> the actual traffic visible on the network, so doesn't see such
> loopback traffic.
>
> Are you running a trap receiver on the local box?
> If so, how did you start it?
>
> Dave
>

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<div>Don t really know what a &quot;local box&quot; is...</div>
<div>nor a &quot;trap receiver&quot;...</div>
<div>could you please be more clear?</div>
<div>&nbsp;</div>
<div>Daniel Coelho<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 5/22/07, <b class="gmail_sendername">Dave Shield</b> &lt;<a href="mailto:D.T.Shield@csc.liv.ac.uk">D.T.Shield@ csc.liv.ac.uk</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On 22/05/07, Daniel Coelho &lt;<a href="mailto:danicoelho7@gmail.com">danicoelho7@gm ail.com</a>&gt; wrote:
<br>&gt; When I do<br>&gt; snmptrap&nbsp;&nbsp;-v 1 -c public&nbsp;&nbsp;localhost&nbsp;&nbsp; ''&nbsp;&nbsp;0 0&nbsp;&nbsp;'' coldStart.0<br>&gt; or<br>&gt; snmptrap&nbsp;&nbsp;-v 1 -c public&nbsp;&nbsp; <a href="http://127.0.0.1">127.0.0.1</a>&nbsp;&nbsp;''&nbsp;&nbsp;0 0&nbsp;&nbsp;''
coldStart.0<br>&gt; or<br>&gt; snmptrap&nbsp;&nbsp;-v 1 -c public&nbsp;&nbsp; <a href="http://172.18.50.103">172.18.50.103</a>&nbsp;&nbsp;''&nbsp;&nbsp;0 0&nbsp;&nbsp;'' coldStart.0<br>&gt; I get nothing with tcpdump. ( <a href="http://172.18.50.103">172.18.50.103
</a> being my IP)<br><br><br>If you are sending traffic to the local machine, it will probably<br>use the loopback interface, and never actually appear on<br>the network at all.&nbsp;&nbsp;I suspect that tcpdump is monitoring<br>the actual traffic visible on the network, so doesn't see such
<br>loopback traffic.<br><br>Are you running a trap receiver on the local box?<br>If so, how did you start it?<br><br>Dave<br></blockquote></div><br>

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