Internet Offline: IPv6 ipref

Install

apt install iperf

Benchmarking IPv6

Server side:

iperf -s -m -V

Client side:

iperf -c <IPv6 Server> -V>
iperf -c <IPv4 Server>

Benchmark UDP Jitter

iperf -s -u -i 1 -V

iperf -c <IPv6 Server> -u -b 10m -V
iperf -c <IPv4 Server> -u -b 10m

Bandwidth

Use the -F or -I option. If you want to test how your network performs with compressed / uncompressed streams, just create representative streams and use the -F option to test it. This is usually due to the link layer compressing data.

The -F option is for file input.
The -I option is for input from stdin.

E.g.

Client: $ iperf -c <server address> -F <file-name>
Client: $ iperf -c <server address> -I