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Posted by News Reader on July 4, 2008, 4:00 pm
Scooty wrote:
> Hi all
> I want to do some 'sniffing' on my network due to users reporting
> speed issues on the LAN, I have PRTG installed but I am not seeing
> anything unusual in the graphs to indicate high utilisation on the LAN
> I have downloaded and installed Ethereal. On my system of course in a
> switched network, I am seeing traffic over the wire, but it is only
> traffic originating or destined for my IP and of course broadcast
> traffic
> I remember there was a way on a Cisco switch to set a port that
> basically acts as a conduit for all traffic that passes over the
> fabric
> I want to set a system up to capture all data packets over the network
> for analysis, if someone could tell me the best way to do this it
> would be appreciated
>
> Scott
The following is an example of Switch Port Analyzer (SPAN) on a Cisco 2950T:
e.g.:
monitor session 1 source interface Fa0/1
monitor session 1 destination interface Fa0/16 encapsulation dot1q
In this case I chose an inter-VLAN routing trunk port (Fa0/1) as the
SPAN source, and the Fa0/16 port as the SPAN destination. I used
"encapsulation dot1q" to preserve the 802.1Q headers, but that's optional.
As the other responder stated, you should consult the documentation for
your specific platform.
Best Regards,
News Reader
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