Yes, in MikroTik RouterOS, as well as many other network systems, the default IPv6 route can be received dynamically in several ways.

This capability is crucial to simplify network configuration and ensure proper connectivity without manual intervention.

We indicate the main ways in which a MikroTik router can receive a default route in IPv6 dynamically:

1. SLAAC (Stateless Address AutoConfiguration)

SLAAC is the most common method for automatic address configuration in IPv6, but in addition to address assignment, it can also involve receiving the default route.

When MikroTik devices are configured to use SLAAC, they can receive the default route through the router advertisements (RAs) that the routers send.

These advertisements not only provide information about network segmentation and available addresses, but also include the default route if the “Router Lifetime” bit is set appropriately in the RA.

2. DHCPv6

The DHCPv6 protocol can also be used to receive the default route:

• DHCPv6 Stateless: In this mode, DHCPv6 is mainly used to provide additional information, such as DNS settings. However, for the default route, SLAAC over RAs is normally still used.
• DHCPv6 Stateful: This mode is similar to DHCP in IPv4, where the DHCP server can assign IP addresses, subnet masks, the default route, DNS and other options. The ability to receive the default route over DHCPv6 depends on the configuration of the DHCPv6 server and client.

Configuration in MikroTik RouterOS

To configure a MikroTik device to receive the default route automatically, you must ensure that it is configured to accept router advertisements or to receive configurations via DHCPv6.

Here's how to configure MikroTik to accept the default route through SLAAC:

/ipv6 settings
set accept-router-advertisements=yes

This setting allows the device to receive and use the default routes advertised by routers on the network. If you are using DHCPv6, make sure that your DHCPv6 server configuration is designed to send the default route option and that the MikroTik client is configured to accept and process this information.

Considerations

Ensure that the network environment is configured correctly and that devices advertising the route (either via SLAAC or DHCPv6) are authorized and configured securely to avoid routing or security issues.

Additionally, check the firewall configuration in MikroTik to ensure that it allows the traffic necessary for these protocols.