TFGen - A Simple and Effective Tool for Point to Point Network Testing
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in the case of packet sender, you can see the traffic was generated and collected on your tf101. now you can use the info from that packet to figure out where exactly the holes are in your firewall or where it would be best to add additional firewalls, depending on your needs and the information you gather.
of course, if you need to take an even deeper look at packet flows and protocols, you can do that as well. packet sender is a great tool for doing that and its easy to add to your arsenal. you can download packets, and you can load them onto your tf101, tf102, or any other equipped device. or you can use a tf102 and one of the numerous external hosts that are out there that you can use to generate network traffic (for example, the community provided raw traffic generators at wotp.in or the tf102 page by alfak.org .
you can also printout packets or draw them on a virtual graphing device like terraview (see below). this allows you to more easily see where some of the problems may lie, then you can figure out where you would need to add more firewalls. in packet sender you can also generate different types of packets, one of which is the icmp (internet control message protocol) ping packet, which is the same packet that you can get through iana.org .