Free ethereal packet sniffer software for windows

Network Sniffer is a Windows based Packet sniffer an Network analyzer
Network Sniffer is a Windows based Packet sniffer an Network analyzer, a revolutionary new network management tool designed from the ground up with ease and functionality in mind.
Network Sniffer aids at monitoring network traffic in order to recognize and decode certain packets of interest. Network Sniffer puts your Network adapter into listening mode, capturing everything that travels through the Network.
This can help you solve network bottlenecks or spot illegitimate activity like crack attacks, Spyware, and other sort of malicious, unormal Traffic.
Key Features:
1. Simple network sniffer/packet capturing tool
2. Intuitive user interface.
3. Can detect OSs, sessions, hostnames, open ports etc.
4. Does overload traffic on the network. 5. Can also parse PCAP files for off-line analysis.

Colasoft Packet Player 1.1 build 186 is an effective utility that allows you to open captured packet trace file and playback in the network.

Major Features:

1. Colasoft Packet Player supports many packet trace file formats created by many sniffer software, such as Colasoft Capsa, Ethereal, Network General Sniffer and WildPackets EtherPeek/OmniPeek etc, it also support burst mode and loop sending feature.
2. Except sending packet files in original interval between loops, Colasoft Packet Player also supports sending packet files in burst mode and defining the delay between loops if the loop count is more than one.
3. Replay a packet file is very simple. First, you need choose an active network adapter for sending packet, and then specify a packet file, you can also set following options:
   • Burst Mode - If checked, Colasoft Packet Player will send packets one after another without wait. If you want to send packets in its normal speed, leave this option unchecked.
   • Loop Sending - Specify the loop times of sending packet file. Enter zero if you want to keep sending packets until you stop it manually.
   • Delay Between Loops - Specify the interval between every loop.

Requirements: Windows 2000/XP/2003/Vista

VisualSniffer is a powerful packet capture tool and protocol analyzer (ip sniffer or packet sniffer) for Windows system. VisualSniffer can be used by LAN administrators, and security professionals for network monitoring, intrusion detection, and network traffic logging. It can also be used by network programmers for checking what the developing program has sent and received, or others to get a full picture of the network traffic. For example, parents may want to know what kids are doing online. If you stored important data in your PC, you may need to detect whether your data is sending out by some "Adware" or "Spyware". If you are a student, you may want to know how your network is working and the mechanism of each network protocol. VisualSniffer is free software, available with full source code under the terms of the BSD License.