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IPv6

[ -f /proc/net/if_inet6 ] && echo 'IPv6: yes' || echo 'IPv6: no'

modprobe ipv6
cat /proc/net/if_inet6

# disable
sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1
sysctl -w net.ipv6.conf.lo.disable_ipv6=1