Syn Packets

Another aspect of enumeration of hosts is the determining of TCP ports in an OPEN state, that is to say TCP ports which respond to SYN packets with a Syn and the ACK flag set, Syn-Ack. Synscan is impressively fast at determinining this via the use of two processes, one to send the Syn packets... Platforms: *nix

DNS Blacklist Packet Filter project is a Linux netfilter client that decides whether to accept or drop packets based on the results of a DNS blacklist query (such as MAPS, SORBS, or SPEWS, to name a few). One use is to filter all incoming SMTP SYN packets for spam filtering.. Platforms: *nix

psad is a collection of three lightweight system daemons (two main daemons and one helper daemon) that run on Linux machines and analyze Netfilter log messages to detect port scans and other suspicious traffic. psad incorporates many signatures from the Snort intrusion detection system to... Platforms: *nix

Honeytrap project trap attacks against tcp services. Honeytrap is a network security tool written to observe attacks against TCP services. As a low-interactive honeypot, it collects information regarding known or unknown network-based attacks and thus can provide early-warning information. The... Platforms: *nix

Syn-Thesis is designed as a handy and accessible additive synthesizer that features 4 oscillators. The waveform of each oscillator can be created by adding up to 64 harmonics. Syn-Thesis can be used as a VST plugin. Platforms: Windows

IP packets generator, use row socket to generate various IP packets, including ICMP,TCP,UDP or user defined with fake source IP.Use for network testing. (I write this program to test the router) Platforms: *nix

syn is an Open Source Text- and Programming Editor with Syntax highlight for many Languages, and some IDE Features, like starting a program (e.g. Compiler) and capture the output, support for Projects etc. syn is written in Delphi (Version 5, Updatepack 1) for maximum performance, stability and... Platforms: Windows

Yavipind is a secure tunnel aka 2 peers securely forwarding packets toward each other. It forwards any kind of packet (IPv4, IPv6 or other) sent over the virtual point-to-point device (e.g. tun0). It fully runs in linux userspace. yavipin has been written because i wasnt satisfied by the... Platforms: *nix

EtherSnoop light is a free network sniffer, designed for capturing and analysis of the packets going through the network.It captures the data passing through your dial-up connection or network Ethernet card, analyzes the data and represents it in a readable form. EtherSnop light is a full... Platforms: Windows

Aimwatch is a packet sniffer designed to reconstruct AOL Instant Messenger and ICQ information by passively collecting packets from the network.. Platforms: *nix

rshaper is a Linux kernel module that limits the incoming bandwidth for packets aimed at different hosts. While the former issue can be addressed with the conventional shaper driver, the latter cant be easily addressed by the standard shaper. As a matter of facts, I have not been able to use... Platforms: *nix

diald-top maintains a top-like listing of all packets and their time to live for use with diald. This project needs a new lead developer as the author no longer uses diald. The concept behind diald-top is very simple. I got sick of trying to read a monitor pipe flying by on an extra VC, so I... Platforms: *nix

Ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies. At first glance, this might seem like a rather useless thing to do, but it can actually come in your help in some... Platforms: *nix

ETrace is a configurable static port network tracing tool, similar to traceroute, but supporting ICMP, TCP, UDP and other IP protocols. Usage: etrace [ -BbCcnv ] [ -p profile ] [ -F config ] [ -i interface ] [ -I icmp-type ] [ -T port ] [ -U port ] [ -P protocol ] [ -r probe-count ] [ -t... Platforms: *nix

mod_iptos can set IPTOS values on outgoing packets to assist traffic shaping. I wanted bandwidth control for a few virtual hosts, but i did not like the userland methods -- they were inaccurate and buggy. I wanted to take advantage of the linux kernel traffic shaping which i was already using... Platforms: *nix

Layer-7 Packet Classifier for Linux is a classifier for the Linux kernels Netfilter subsystem that identifies packets based on application layer data (OSI layer 7). This means that it can classify packets as HTTP, FTP, Gnucleus, eDonkey2000, etc, regardless of port. Our classifier complements... Platforms: *nix

TCP Knocking provides a port knocking implementation. Often a secure system needs a port open so that only authorized persons can access a particular service and also the service should not exposed to attackers and worms that may use vulnerabilities that exist in the listening server. Port... Platforms: *nix

libnetfilter_queue is a userspace library providing an API to packets that have been queued by the kernel packet filter. libnetfilter_queue library is is part of a system that deprecates the old ip_queue / libipq mechanism. libnetfilter_queue has been previously known as libnfnetlink_queue.. Platforms: *nix

ippl is a daemon which logs IP packets sent to a computer. It runs in the background, and displays information about the incoming packets. Criteria can be used to specify what packets should be logged and what packets should be ignored. ippl is free software and its licensed under the GPL... Platforms: *nix

Hogwash is an inline packet scrubber that uses Snorts detection engine to drop malicious packets before they reach the target. The original version of what is now hogwash was written in 1996 while I was at Idaho State University. I had a web server that when patched, broke the software it... Platforms: *nix