Disable IPv6: Difference between revisions

Revision as of 22:09, 30 July 2022

The kernel option ipv6.disable=1 disables the whole IPv6 stack
If using the kernel option is not possible, add the following parameters to /etc/sysctl.conf:

# Disable IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.eth0.disable_ipv6 = 1
...

to prevent configuration of IPv6 for listed interfaces.

To force ntpd to not use IPv6 add -4 to

CMDLINE="/usr/sbin/ntpd -4 -g"

in /etc/rc.d/rc.ntpd

To force sshd to listen IPv4 only add

AddressFamily inet

to /etc/ssh/sshd_config

To force httpd to listen IPv4 only, specify an IPv4 address on all Listen directives, for example,

Listen 0.0.0.0:80

(in /etc/httpd/httpd.conf and/or /etc/httpd/extra/httpd-ssl.conf)

To disable IPv6 in bind add -4 to NAMED_OPTIONS in /etc/default/named, add

listen-on-v6 { none; };

to options in /etc/named.conf, and add

plugin query "/usr/lib64/named/filter-aaaa.so" {
  filter-aaaa-on-v4 yes;
  filter-aaaa-on-v6 yes;
};

after options in /etc/named.conf

To disable IPv6 in postfix use the option inet_protocols in /etc/postfix/main.cf
To disable IPv6 in sendmail use the option Family=inet in DAEMON_OPTIONS and CLIENT_OPTIONS

@@ Line 16: / Line 16: @@
 <pre>Listen 0.0.0.0:80</pre>
 (in <code>/etc/httpd/httpd.conf</code> and/or <code>/etc/httpd/extra/httpd-ssl.conf</code>)
-*To disable IPv6 in <code>bind</code> add <code>-4</code> to <code>NAMED_OPTIONS</code>
+*To disable IPv6 in <code>bind</code> add <code>-4</code> to <code>NAMED_OPTIONS</code> in <code>/etc/default/named</code>, add
-to <code>/etc/default/named</code>, add
 <pre>listen-on-v6 { none; };</pre>
 to <code>options</code> in <code>/etc/named.conf</code>, and add

Disable IPv6: Difference between revisions

Revision as of 22:09, 30 July 2022

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