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refactor(netcat): review article

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Michele Cereda
2025-09-11 20:08:19 +02:00
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knowledge base/nc.md → knowledge base/netcat.md
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@@ -1,5 +1,13 @@
# Netcat # Netcat
1. [TL;DR](#tldr)
1. [Further readings](#further-readings)
1. [Sources](#sources)
## TL;DR
Options of interest:
- `-N`: close the network socket when finished; not available in nmap's netcat - `-N`: close the network socket when finished; not available in nmap's netcat
- `-l`: bind to the port and listen for incoming connections (server mode) - `-l`: bind to the port and listen for incoming connections (server mode)
- `-n`: do not resolve hostnames via DNS - `-n`: do not resolve hostnames via DNS
@@ -10,14 +18,11 @@
- `-w=SECS`: timeout for connects and final net reads, in seconds - `-w=SECS`: timeout for connects and final net reads, in seconds
- `-z`: zero-I/O mode, exit once connected - `-z`: zero-I/O mode, exit once connected
## Table of contents <!-- omit in toc -->
1. [TL;DR](#tldr)
1. [Sources](#sources)
## TL;DR
```sh ```sh
# Install
dnf install 'nmap-ncat'
yum install 'nmap-ncat'
# Check ports on hosts. # Check ports on hosts.
nc -Nnvz 192.168.0.81 22-25 nc -Nnvz 192.168.0.81 22-25
nc -Nvz host.name 443 nc -Nvz host.name 443
@@ -35,12 +40,15 @@ until nc -Nvz -w 3 pi.lan 22; do sleep 3; done
nc -l 5666 nc -l 5666
``` ```
## Sources ## Further readings
### Sources
- [How To use Netcat to establish and test TCP and UDP connections] - [How To use Netcat to establish and test TCP and UDP connections]
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