But in ad hoc networks, there is no access point each node connects in a peer-to-peer way. Infrastructure networks have one or more access points that coordinate the traffic between the nodes. This is still handy for very big captures, captures that require traffic after they have been altered (QoS) or auditing and EPC should only be used for small captures and filtered so it does not affect the switch in anyway.Wireless networks are based on IEEE 802.11 standards defined by the Institute of Electrical and Electronics Engineers (IEEE ) for ad hoc networks or infrastructure networks. Before the Embedded Packet Capture and one of the first tasks I was assigned when I went to my first enterprise environment was the Port Mirroring feature.Ĭopy everything from this port (source) and dump it to this port (destination), attach a laptop with wireshark and capture. Looks like it either lost its configuration or has never had it! This subnet is also supposed to be static assignment only. I ran it for only a few seconds and intercepted 3 packets. I can then open it on the switch or copy to my local machine. This EPC feature allows me to take a very quick capture on the port and store it in memory or in a file on the switch. That would take too long, why not do it on the switch itself! My colleague suggested he install wireshark and take a capture from the device. The final thought was, ok I guess it has never been given an IP or it has lost its IP. I then decided, lets reload the device, force it to broadcast to its default gateway and talk with its fellow devices, still nothing. I tried the arp command again and saw nothing for the MAC I have.
I got some hits of IPs within the subnet and even some IPs that people have assigned that are not routable within the VLAN as well. I initiated a broadcast ping, so ping the broadcast IP of the subnet to force all hosts to respond. Seems, there was a MAC, but no ARP entry? I suspected the device hasn’t spoken to its gateway for sometime and timed out. I thought too easy, I’ll jump on and get the mac from the port, check the arp table on the Layer 3 Core switch and boom.
I was just working on a task with an AV colleague, he has inherited some equipment and didn’t know the IP address but did know the switchport it was patched into.
I just love this tool that Cisco provides in new switches, the Embedded Packet Capture.
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