Update configuration on IPv6 prefix change

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With changing IPv6 prefix from ISP this script handles to update...

  • ipv6 firewall address-list
  • dns records

Requirements and installation

Just install the script:

$ScriptInstallUpdate ipv6-update;

Your ISP needs to provide an IPv6 prefix, your device receives it via dhcp:

/ ipv6 dhcp-client add add-default-route=yes interface=ppp-isp pool-name=isp request=prefix script=ipv6-update;

Note this already adds this script as script. The pool name (here: "isp") is important, we need it later.

Also this expects there is an address assigned from pool to an interface:

/ ipv6 address add from-pool=isp interface=br-local;

Sometimes dhcp client is stuck on reconnect and needs to be released. Installing ppp-on-up may solve this.


An address list entry is updated with current prefix and can be used in firewall rules, comment has to be "ipv6-pool-" and actual pool name:

/ ipv6 firewall address-list add address=2003:cf:2f0f:de00::/56 comment=ipv6-pool-isp list=extern;

Static DNS records need a special comment to be updated. Again it has to start with "ipv6-pool-" and actual pool name, followed by a comma, "interface=" and the name of interface this address is connected to:

/ ip dns static add address=2003:cf:2f0f:de00:1122:3344:5566:7788 comment="ipv6-pool-isp, interface=br-local" name=test.example.com ttl=15m;

See also

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