Disable IPv6: Difference between revisions

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to the end of <code>/etc/ssh/sshd_config</code>
to the end of <code>/etc/ssh/sshd_config</code>
*To disable IPv6 in <code>sendmail</code> use the option <code>Family=inet</code> in <code>DAEMON_OPTIONS</code> and <code>CLIENT_OPTIONS</code>
*To disable IPv6 in <code>sendmail</code> use the option <code>Family=inet</code> in <code>DAEMON_OPTIONS</code> and <code>CLIENT_OPTIONS</code>
[[Category: Linux]]

Revision as of 21:56, 21 August 2016

  • 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
# Listen IPv4 only
AddressFamily inet

to the end of /etc/ssh/sshd_config

  • To disable IPv6 in sendmail use the option Family=inet in DAEMON_OPTIONS and CLIENT_OPTIONS
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