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OSTU - Determining IP Address (by Tony Fortunato)
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Transcript of OSTU - Determining IP Address (by Tony Fortunato)
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© 2008 www.thetechfirm.com
Wireshark Troubleshooting
Tony Fortunato, Sr Network SpecialistThe Technology Firm
How To Determine A Device’s IP Address
![Page 2: OSTU - Determining IP Address (by Tony Fortunato)](https://reader036.fdocuments.us/reader036/viewer/2022082915/54574e75af7959280e8b4a64/html5/thumbnails/2.jpg)
© 2008 www.thetechfirm.com
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
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© 2008 www.thetechfirm.com
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
![Page 4: OSTU - Determining IP Address (by Tony Fortunato)](https://reader036.fdocuments.us/reader036/viewer/2022082915/54574e75af7959280e8b4a64/html5/thumbnails/4.jpg)
© 2008 www.thetechfirm.com
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
![Page 5: OSTU - Determining IP Address (by Tony Fortunato)](https://reader036.fdocuments.us/reader036/viewer/2022082915/54574e75af7959280e8b4a64/html5/thumbnails/5.jpg)
© 2008 www.thetechfirm.com
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
![Page 6: OSTU - Determining IP Address (by Tony Fortunato)](https://reader036.fdocuments.us/reader036/viewer/2022082915/54574e75af7959280e8b4a64/html5/thumbnails/6.jpg)
© 2008 www.thetechfirm.com
Results
Try to ping, then telnet or http to access the device
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© 2008 www.thetechfirm.com
Wireshark Training - QuickStart
Tony Fortunato, Sr Network SpecialistThe Technology Firm
Thank you
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© 2008 www.thetechfirm.com
For additional educational videos on Open Source Network Tools, please click on the following …
http://www.lovemytool.com/blog/ostu.html
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