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TL;DR

# nov/10/2022 23:21:04 by RouterOS 6.49.7
/interface vlan add interface=ether1 name=vlan31-fonira vlan-id=31
/interface pppoe-client add add-default-route=yes default-route-distance=10 disabled=no interface=vlan31-fonira name=pppoe-fonira password=Password user=UserID
/interface list member add interface=pppoe-fonira list=WAN
/ipv6 dhcp-client add interface=pppoe-fonira request=address
/ipv6 address add address=2001:0DB8:0:1::/64 eui-64=yes interface=bridge

Configuration

This configuration assumes a recent default router configuration as a starting point (WAN and LAN interface lists, corresponding IPv4 and IPv6 firewall setup, ether1 connected to modem). Keep your UserID, password and IPv6 prefix ready and follow these steps. Your static IPv4 address will be assigned automatically. For security reasons, keep the modem disconnected from the router during the setup! These steps have been extracted from a running config on RouterOS version 6.49.7.

First, add a VLAN interface. The provided modem (ZYXEL VMG4005-B50A) is configured such that VLAN 31 (tagged) provides the internet service.

/interface vlan add interface=ether1 name=vlan31-fonira vlan-id=31

Add a PPPoE client. The fixed IP service is provided via PPPoE, the correct “static” IPv4 address is assigned automatically. Note: If you have your modem connected during this step, the router will become accessible from the internet immediately. The default firewall config would allow forwarding to the internal network.

/interface pppoe-client add add-default-route=yes default-route-distance=10 disabled=no interface=vlan31-fonira name=pppoe-fonira password=Password user=UserID

Add the PPPoE interface to the WAN interface list. The default firewall config blocks forwarding from the WAN interfaces to other (internal) networks and performs SRC-NAT (masquerading) for outgoing IPv4 traffic. You can connect your modem after this step.

/interface list member add interface=pppoe-fonira list=WAN

Add a DHCPv6 client to the PPPoE interface. That way the router learns its default route, DNS servers etc.

/ipv6 dhcp-client add interface=pppoe-fonira request=address

Add an IPv6 address to your local (LAN) bridge and advertise the route (replace 2001:0DB8:0:1::/64 with a prefix in your assigned range). Note: The default /ipv6 nd config will thankfully also include IPv6 DNS servers learned via DHCPv6 in the announcements. Thus, any clients will be automatically configured via SLAAC.

/ipv6 address add address=2001:0DB8:0:1::/64 eui-64=yes interface=bridge

If your desktop operating system is younger than 15 years (as of 2022) all that is left to do is to visit https://ipv6.google.com/ in your browser to verify IPv6 connectivity. This google subdomain will successfully load via IPv6 only.

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