Wireshark Troubleshooting Tony Fortunato, Sr Network Specialist The Technology Firm How To Determine A Device’s IP Address
What are you talking about? <ul><li>Many times I have some network equipment and its IP address wasn’t documented or docum...
Setup Ethernet Ethernet I suggest putting a hub in between since powering up the Proxim device may cause the PC to miss so...
What To Do <ul><li>Its pretty simple,  </li></ul><ul><ul><li>Start a capture  </li></ul></ul><ul><ul><li>Go to Statistics-...
Review Trace <ul><li>The key here is to look for a  GRATUITOUS ARP . 99.99% of all IP devices send out this specific ARP p...
Results <ul><li>Try to ping, then telnet or http to access the device </li></ul>
Wireshark Training - QuickStart Tony Fortunato, Sr Network Specialist The Technology Firm Thank you
<ul><li>For additional educational videos on Open Source Network Tools, please click on the following … </li></ul><ul><li>...
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OSTU - Determining IP Address (by Tony Fortunato)

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Tony Fortunato is a Senior Network Specialist with experience in design, implementation, and troubleshooting of LAN/WAN/Wireless networks, desktops and servers since 1989. His background in financial networks includes design and implementation of trading floor networks. Tony has taught at local high schools, Colleges/Universities, Networld/Interop and many onsite private classroom settings to thousands of analysts.

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OSTU - Determining IP Address (by Tony Fortunato)

  1. 1. Wireshark Troubleshooting Tony Fortunato, Sr Network Specialist The Technology Firm How To Determine A Device’s IP Address
  2. 2. What are you talking about? <ul><li>Many times I have some network equipment and its IP address wasn’t documented or documented incorrectly </li></ul><ul><li>Here’s how to use Wireshark to figure out what its IP address is </li></ul><ul><li>In this example I actually have this issue with several Proxim MP.11 wireless subscriber units </li></ul>
  3. 3. 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
  4. 4. What To Do <ul><li>Its pretty simple, </li></ul><ul><ul><li>Start a capture </li></ul></ul><ul><ul><li>Go to Statistics-> Endpoint Report and look for the devices’ Ethernet address (Proxim in my example) </li></ul></ul><ul><ul><li>Right Click on that address and Apply As Filter->Selected </li></ul></ul>
  5. 5. Review Trace <ul><li>The key here is to look for a GRATUITOUS ARP . 99.99% of all IP devices send out this specific ARP packet upon bootup </li></ul><ul><li>The ARP is used to determine if this device has a duplicate IP Address </li></ul><ul><li>This can be seen in the ARP packet details since the Sender and Target IP is the same </li></ul>
  6. 6. Results <ul><li>Try to ping, then telnet or http to access the device </li></ul>
  7. 7. Wireshark Training - QuickStart Tony Fortunato, Sr Network Specialist The Technology Firm Thank you
  8. 8. <ul><li>For additional educational videos on Open Source Network Tools, please click on the following … </li></ul><ul><li>http://www.lovemytool.com/blog/ostu.html </li></ul>LoveMyTool.com – Community for Network Tools

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