http://www.mikrotik.com/thedude.phpThe Dude network monitor is a new application by MikroTik which can dramatically improve the way you manage your network environment. It will automatically scan all devices within specified subnets, draw and layout a map of your networks, monitor services of your devices and alert you in case some service has problems.
http://www.wireshark.org/Sniff Free or DieSame developers, same code, different name. The Ethereal network protocol analyzer has changed its name to Wireshark.
Wireshark's powerful features make it the tool of choice for network troubleshooting, protocol development, and education worldwide.
Wireshark was written by an international group of networking experts, and is an example of the power of open source. It runs on Windows, Linux, UNIX, and other platforms.
http://www.ks-soft.net/ip-tools.eng/IP-Tools includes 19 utilities:Local Info - examines the local host and shows info about processor, memory, Winsock data, etc
Connection Monitor - displays information about current TCP and UDP network connections
NetBIOS Info - gets NetBIOS information about network interfaces (local and remote computers)
NB Scanner - shared resources scanner
SNMP Scanner - scans network(s) for SNMP enabled devices
Name Scanner - scans all hostnames within a range of IP addresses
Port Scanner - scans network(s) for active TCP based services
UDP Scanner - scans network(s) for active UDP based services
Ping Scanner - pings a remote hosts over the network
Trace - traces the route to a remote host over the network
WhoIs - obtains information about a Internet host or domain name from the NIC (Network Information Center)
Finger - retrieves information about user from a remote host
LookUp - looks for domain names according to its IP address or an IP address from its domain name
GetTime - gets time from time servers (also it can set correct time on local system)
Telnet - telnet client
HTTP - HTTP client
IP-Monitor - shows network traffic in real time (as a set of charts)
Host Monitor - monitors up/down status of selected hosts.
Trap Watcher - allows you to receive and process SNMP Trap messages.
http://www.angryziber.com/ipscan/Angry IP scanner is a very fast IP scanner and port scanner. It can scan IP addresses in any range as well as any their ports. Its binary file size is very small compared to other IP or port scanners. Angry IP scanner simply pings each IP address to check if it's alive, then optionally it is resolving its hostname, determines the MAC address, scans ports, etc. The amount of gathered data about each host can be extended with the available plugins.
http://www.nsauditor.com/network_tools/free_port_scanner.htmlFree Port Scanner is a small, fast, easy-to-use and robust port scanner for the Win32 platform. You can scan ports on fast machines in a few seconds and can perform scan on predefined port ranges. This tool uses TCP packets to determine available hosts and open ports, service associated with port and other important characteristics.Â The tool is designed with a user-friendly interface and is easy to use.
FileZilla Server is a free reliable FTP server. Brought to you by the developers of the 100% FREE ftp client Filezilla this server provides you with all the features you seek in a simple, yet easy to use FTP server
Sam Spade is a free and useful network query utility.
Here are some key features of "Sam Spade":
Each tool displays it's output in it's own window, and everything is multi-threaded so you don't need to wait for one query to complete before starting the next one
Some functions are threaded still further to allow lazy reverse DNS lookups (never do a traceroute -n again)
The output from each query is hotlinked, so you can right click on an email address, IP address, hostname or internic tag to run another query on it
Appending the results of a query to the log window is a single button function
There's a lot of online help, in both WinHelp and HTMLHelp formats. This includes tutorials, background information and links to online resources as well as the program manual itself.
TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on your system, including the local and remote addresses and state of TCP connections. On Windows NT, 2000 and XP TCPView also reports the name of the process that owns the endpoint. TCPView provides a more informative and conveniently presented subset of the Netstat program that ships with Windows. The TCPView download includes Tcpvcon, a command-line version with the same functionality.