Learn how to disable ipv6 in Bind9. Our Server Management Support team is here to help you with your questions and concerns.

Bind9 Disable IPv6 | Guide

If you have been experiencing timeouts or sluggish DNS resolving with Bind9 on your Linux server, you are in the right place.

It may be due to IPv6 support causing unnecessary delays. Our experts have put together this guide to fine-tune the Bind9 configuration.

1. Disabling IPv6 Support

   Follow these steps to set up Bind9:

   1. To begin with, head to the configuration file `/etc/bind/named.conf.options`.
   2. Then, add the following lines within the `options` section:

      options {
dnssec-enable no;
filter-aaaa-on-v4 yes;
};

   3. Then, save and close the file.
   4. Next, open the file `/lib/systemd/system/bind9.service` for editing.
   5. Then, modify the `ExecStart` line by appending `-f -4`:

      [Service]
ExecStart=/usr/sbin/named -f -4 $OPTIONS

   6. Save the file and restart the Bind9 DNS server.
2. Disable IPv6 (AAAA) Response

   If we are using Bind9 as our DNS service and wish to disable IPv6 responses, here’s what we need to do:

   1. First, open `/etc/bind/named.conf.options`.
   2. Then, add the following line in the `options` section:

      filter-aaaa-on-v4 yes;
   3. Now, save the changes.
   4. Then, run this command to restart bind9:

      service bind9 restart

      With IPv6 responses filtered out, our DNS requests will be more efficient.
3. Disabling IPv6 Name Resolution

   For Bind 9.x servers, we can disable IPv6 name resolution as seen here:

   1. First, open `/etc/sysconfig/named` for editing.
   2. Then, add this line:

      OPTIONS="-4"
   3. Now, make sure BIND 9 is compiled with the `–enable-filter-aaaa` option.
   4. Next, add `filter-aaaa-on-v4 yes;` to the `named.conf` file.
   5. Finally, restart the Bind service:

In case of any errors during startup, check the `/var/log/messages` file for troubleshooting.

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Conclusion

In brief, our Support Experts demonstrated how to disable ipv6 in Bind9.