11-09-2011 04:39 PM
Hi all,
I'm troubleshooting a LAN issue I have, and I wanted to hook up wireshark to record traffic over the course of a couple of hours for later diagnostics. I went into the web administration interface, clicked Administration > Diagnostics > Port and VLAN Mirroring, and added a port mirror from the port I wanted to watch to a port to which I had connected a laptop. I picked the Tx and Rx options, and clicked Apply.
I did receive lots of traffic in wireshark, but I noticed immediately that the server on the port I had mirrored was suddenly unavailable on the network -- pings timed out. This lasted until I removed the mirror, then the server was suddenly reachable once again.
Does this feature not work the way I had thought it does? What I saw looked more like a forward than what I would call a mirror. The documentation leads me to believe mirroring is intended to be used in just the way I was attempting to use it.
Am I missing something?
11-10-2011 11:08 AM
Hi Lamint,
I have a SG300-10P for my test, I did the same thing you did in my GUI.
I was mirroring port 7 to port 8 ticking the item to mirror RX and TX
My PC with wireshark was residing on port 8.
I started a comtinuous oibg from my PC on port 7 at IP address 192.168.10.60 to my WAN routers LAN address, 192.168.10.1 .
As you can see from my screen capture below, my PC on port 8 caprtured both RX and TX packets on port 7.
Because my wireshark PC was on port 8, I could not access the management interface of the switch to show you my configuration, so I grabbed the configuration via hyperterminal.
See screen caopture below ( with some configuration items excluded)..
I would suggest, if you are having issues to allow the Small Business Support Center to assist you.
http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html
Hope this helps
regards Dave
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