Free Axence NetTools is a comprehensive set of host
monitoring, network scanning, security &
administration tools - all with a highly intuitive
user interface:

- Port scanner - checks for all open ports and running
services. It can discover some Trojans/spyware.

- Network scanner - discovers all nodes in a remote
network, their IP/MAC and services running on them.

- NetStat - displays your computer's inbound and
outbound connections, lists all open TCP/UDP ports,
with the remote IP address & the process using the
connection.

- TCP/IP workshop - establishes low-level TCP/UDP
connections to troubleshoot and test network services.
It can send raw data to any remote port.

- Other tools: fast traceroute shows information about

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