Add these three lines on /etc/sysctl.conf -

net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1

followed by the command 'sudo sysctl -p' to disable the ipv6 permanently.

#Networking #LinuxNetworking #TCPIP #Subnetting #ipaddress
#LinuxAdministration #Routing #DNS #DHCP #IPTables #LAN #WAN #Ubuntu #server

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