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2.1 KiB
2.1 KiB
Nmap's netcat
TL;DR
Options of interest:
| Option | Summary |
|---|---|
-l, --listen |
bind to the port given in input and listen for incoming connections (server mode) |
-k, --keep-open |
accept multiple connections in listen mode |
-n, --nodns |
do not resolve hostnames via DNS |
-p |
specify the source port to use |
-t |
use telnet negotiation |
-u |
use UDP |
-v |
set verbosity level; can be used several times |
-w=SECS |
timeout for connects and final net reads, in seconds |
-z |
zero-I/O mode, exit once connected |
# Install
brew install 'nmap'
dnf install 'nmap-ncat'
yum install 'nmap-ncat'
# Check ports on hosts.
nc -Nnvz 192.168.0.81 22-25
nc -Nvz host.name 443
nc -Nvz -u dns.server 123
# List hosts with a specific port open.
# But you might just want to use `nmap`.
parallel -j 0 "nc -Nnvz -w 2 192.168.0.{} 22 2>&1" ::: {2..254} \
| grep -v "timed out"
# Wait for a host to be up.
until nc -Nvz -w 3 pi.lan 22; do sleep 3; done
# Server mode.
nc -l 5666
nc -lk 8080