Wireshark Troubleshooting Tony Fortunato, Sr Network Specialist The Technology Firm How To Determine A Device’s IP Address

What are you talking about? Many times I have some network equipment and its IP address wasn’t documented or documented incorrectly Here’s how to use Wireshark to figure out what its IP address is In this example I actually have this issue with several Proxim MP.11 wireless subscriber units

Many times I have some network equipment and its IP address wasn’t documented or documented incorrectly

Here’s how to use Wireshark to figure out what its IP address is

In this example I actually have this issue with several Proxim MP.11 wireless subscriber units

Setup Ethernet Ethernet I suggest putting a hub in between since powering up the Proxim device may cause the PC to miss some packets as its Ethernet adapter initializes Proxim Wireless MP.11 unit

What To Do Its pretty simple, Start a capture Go to Statistics-> Endpoint Report and look for the devices’ Ethernet address (Proxim in my example) Right Click on that address and Apply As Filter->Selected

Its pretty simple,

Start a capture

Go to Statistics-> Endpoint Report and look for the devices’ Ethernet address (Proxim in my example)

Right Click on that address and Apply As Filter->Selected

Review Trace The key here is to look for a GRATUITOUS ARP . 99.99% of all IP devices send out this specific ARP packet upon bootup The ARP is used to determine if this device has a duplicate IP Address This can be seen in the ARP packet details since the Sender and Target IP is the same

The key here is to look for a GRATUITOUS ARP . 99.99% of all IP devices send out this specific ARP packet upon bootup

The ARP is used to determine if this device has a duplicate IP Address

This can be seen in the ARP packet details since the Sender and Target IP is the same

Results Try to ping, then telnet or http to access the device

Try to ping, then telnet or http to access the device

Wireshark Training - QuickStart Tony Fortunato, Sr Network Specialist The Technology Firm Thank you

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For additional educational videos on Open Source Network Tools, please click on the following …

http://www.lovemytool.com/blog/ostu.html