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IPv6

Test sites

https://en.wikipedia.org/wiki/Link-local_address

in IPv6, link-local addresses are assigned from the block fe80::/10, and shown in ip addr show with a scope link flag.

IPv6 addr discovery

ip n
ping6 -c4 ff02::1%$(ip r | awk '/def/{ print $5 }')
ping6 ff02::1
ping ff02::1%enx0050b6ebc45b

Disable ipv6 completly

echo 'net.ipv6.conf.all.disable_ipv6 = 1' > /etc/sysctl.d/70-disable-ipv6.conf
sysctl -p -f /etc/sysctl.d/70-disable-ipv6.conf