Enabling the limit
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| vim /etc/sysctl.conf
# Add the configuration
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
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Verify that it took effect
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| ifconfig
# Output
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 114.55.127.xxx netmask 255.255.252.0 broadcast 114.55.119.255
inet6 fe80::219:3eff:fexx:32ec prefixlen 64 scopeid 0x20<link>
ether 00:16:3e:01:49:37 txqueuelen 1000 (Ethernet)
RX packets 68348 bytes 41664492 (39.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 18859 bytes 3632548 (3.4 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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fe80::219:3eff:fexx:32ec is the IPv6 address.
