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Capturing IP traffic

Posted on 2006-05-05
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Last Modified: 2010-03-18
I have a closed VPN device on my Lan that I need to see what traffic is coming into it.  For security reasons No one can access the box internally.  However, I am trying to route specific traffic to it.  Theoretically everything is setup correctly, however it is not working.  I need to see if the data is being routed to the vpn device or not. This way I can tell if I'm having a routing issue or an authentication issue.  I would like to use an old broadcasting HUB to capture the traffic, but I do not have access to one.  I also tried setting putting a seperate firewall on the network with the same ip as the vpn device, but that did not work either.  Any help on this is greatly appreciated.  For more specifics on the routing refer to
Q_21839605.

FNBGPPL
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Question by:fnbgppl
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valicon earned 2000 total points
ID: 16615381
Have you considered using ethereal?

http://www.ethereal.com

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by:fnbgppl
ID: 16615667
valicon,
  I am unfamiliar with how to use ethereal.  The path I need to monitor is between a firewall and a VPN device.  Is ethereal capable of monitoring this traffic?
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Expert Comment

by:valicon
ID: 16615805
ethereal will monitor all traffic on your network, from there you can filter out what you want to monitor. I use it when we have issues with our PIXs. Take a look at it and see if it will fit your needs.
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by:fnbgppl
ID: 16617871
valicon,
  I've got Ethereal up, but I don't understand the data it's returning.  I am filtering through the user guide, is there a more condensed version.  
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Expert Comment

by:valicon
ID: 16626791
Ethereal will show you all traffic on the network. Look for the IP addresses of the devices, they should show up.
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Expert Comment

by:valicon
ID: 16639114
fnbgppl,

Do you need any further assistance with this issue?  
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by:fnbgppl
ID: 16639333
Valicon,
   I'm still trying to get everything to work.  I ended up changing the ip on the laptop to the ip of the vpn device, but I was unable to view the traffic.  However, Ethereal is the tool that I need to use I just have to get it in the right place.  Thank you for your assistance.  Do you know of somewhere that gives a succinct representation of how to interpret the logs?

FNBGPPL
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Expert Comment

by:valicon
ID: 16639387
The only documentation I know of is on the ethereal site. I also wish they had a mini tutorial as well, I think it would help many people.
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by:fnbgppl
ID: 16639413
Thanks
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