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A PPP client and server which is written in Java. It will support AT command modem directly by COM port, without any API (except commAPI) and JNI supported. It is pure Java PPP api. For more, please visit www.simpleteam.com.
IPv4 socket is implemented by pure Java. It is derived from JNode. I have abstracted ipv4 layer from it. If you have IPv4 capability (such as PPP), you can let the whole socket module run ! For more, please visit www. simpleteam.com
For new versions, check https://github.com/Darkkey/javaNetSim
javaNetSim (Java Network Simulator) - it's a fork of a project jFirewallSim. The main goal of javaNetSim is creating a software to simulate various TCP/IP networks based on Ethernet, WiFi, PPP, etc...
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DNScat is a "swiss-army knife" tool to tunnel traffic through DNS servers. It is a small, yet powerfull tool, similar to netcat. In conjunction with PPP server, it allows to build a VPN using DNS packets. DNScat is a useful tool for penetration testing.