$ curl cheat.sh/
 cheat.sheets:iperf 
# iperf
# Network bandwidth measurement tool with client-server functionalities.

# Start an iperf server on the default port (5001)
iperf -s

# Start an iperf server on a specific port (for example, 5201)
iperf -s -p 5201

# Run an iperf client to connect to a server at a specific IP address
iperf -c <server_ip>

# Run an iperf client with a specific bandwidth limit (1 Mbps)
iperf -c <server_ip> -b 1M

# Run an iperf test for a specific duration (10 seconds)
iperf -c <server_ip> -t 10

# Run an iperf test using UDP instead of TCP
iperf -c <server_ip> -u

# Run an iperf test with a specific port (e.g., 5201)
iperf -c <server_ip> -p 5201

# Run a bi-directional bandwidth test (client and then server directions)
iperf -c <server_ip> -d

# Run an iperf test using IPv6
iperf -c <server_ipv6_address> -V

# Generate test report format as JSON
iperf -c <server_ip> --reportstyle C

 tldr:iperf 
# iperf
# Measure network bandwidth between computers.
# More information: <https://iperf.fr>.

# Run on server:
iperf -s

# Run on server using UDP mode and set server port to listen on 5001:
iperf -u -s -p 5001

# Run on client:
iperf -c server_address

# Run on client every 2 seconds:
iperf -c server_address -i 2

# Run on client with 5 parallel threads:
iperf -c server_address -P 5

# Run on client using UDP mode:
iperf -u -c server_address -p 5001

$
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