Kategoriearchive: IPv6


Hetzner – copy IPv6 Reverse-DNS

You can continue to use the old IPv4 subnet with a new server at Hetzner. With IPv6, it does not work unfortunately. Although I do not understand why I can keep all IPv4 (subnet and / or single), but not the IPv6 addresses. It’s annoying when you have to change […]


Workaround for sending mails to google with IPv6 3

If you see host aspmx.l.google.com[2607:f8b0:400d:c02::1b] said: 550-5.7.1 [2607:5300:101::79e] Our system has detected that this message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=i…tication_error for more 550 5.7.1 information. h1si3408978qew.71 – gsmtp (in reply to end of DATA command) the destination dropped […]


send mail with postfix for certain domains using ipv4 or ipv6 only 4

To send outgoing mail with postfix for certain domains only over IPv6 or IPv4, only a few changes are required. The domains are registered in accordance /etc/postfix/transport examplev4.de smtp-ipv4-only: examplev6.de smtp-ipv6-only: /etc/postfix/master.cf: smtp-ipv4-only unix  –       –       n        –       –       smtp        -o inet_protocols=ipv4 smtp-ipv6-only unix  –       –       n        –       –       smtp        -o inet_protocols=ipv6 /etc/postfix/main.cf: transport_maps = hash:/etc/postfix/transport: Execute postmap hash:/etc/postfix/transport and […]


ISPConfig 3.0.5.2 – rewrite ip on mirror(s)

My patch for ISPConfig 3.0.5.1 also works for the latest version 3.0.5.2. Only the language file is not patched, but that can be easily realized by hand. Please understand that I do not find the time at the moment to adapt the patch accordingly – but that’s just a visual […]


ISPConfig 3.0.5 – rewrite ip on mirror(s) 3

I recently posted my solution for rewriting IP-addresses on mirrors here. Since yesterday ISPConfig 3.0.5 is available. The patch works with 3.5.0.1, too. Contrary to the old solution, there is now a patch available. You can now setup the IPv6-rewrite within the Interface. There is no IPv4 rewrite via the […]


ISPConfig rc2 – rewrite ip on mirror(s)

As i described here, i change on a mirror the ipv6 according to the relevant subnet in the vhost-files. I added a rewrite for IPv4 and show you how to use this with the current RC. Use this only with ISPConfig-3.0.5-rc2 For ISPConfig-3.0.5-rc2 see my post here. In /usr/local/ispconfig/server/plugins-available/apache2_plugin.inc.php replace […]


Simply disable IPv6

There are various possibilities to deactivate IPv6 on linux-systems. You can modify entries under /proc, experiment with the kernel modules or god knows what all. I prefer to add just one entry to the grub-option. So i can easily reactivate IPv6 with one step. ipv6.disable=1 After a reboot, the IPv6 […]


ISPConfig – rewrite ip on mirror(s)

As i described here, i change on a mirror the ipv6 according to the relevant subnet in the vhost-files. I added a rewrite for IPv4 and show you how to use this with the current RC. Use this only with ISPConfig-3.0.5-rc1 For some reason my v6-rewrite-code is a part of […]