Debian ipV6 deaktivieren
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Temporaer (sofort)
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6

Dauerhaft (reboot erforderlich)
echo net.ipv6.conf.all.disable_ipv6=1 > /etc/sysctl.d/disable-ipv6.conf && sysctl -p /etc/sysctl.d/disable-ipv6.conf