Jika Anda menggunakan CentOS dan CSF mungkin Anda akan mendapatkan pesan seperti ini di CSF:

 Check for IPv6: IPv6 appears to be enabled [ifconfig: ]. If ip6tables is installed, you should enable the csf IPv6 firewall (IPV6 in csf.conf). To disable IPv6 on RHEL/CentOS you should follow this link.

Untuk mematikan IPv6 bisa dengan cara sebagai berikut:

CentOS 5

[sourcecode]
# touch /etc/modprobe.d/disable-ipv6
# echo "options ipv6 disable=1" >> /etc/modprobe.d/disable-ipv6
[/sourcecode]

CentOS 6: Tambahkan line berikut di /etc/sysctl.conf

[sourcecode]
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
[/sourcecode]

Kemudian restart server Anda.

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