It's for a solution, that the ISP say we will need it. The fiber circuit is deliver through the routers ISP bridge port, and the access to the web is through a VLAN, and lacks an IP alias.
It´s all say for now. We do have an RB2011 for the installation, but we don´t know if we can achieve this.
Hi, If what you need is to add multiple IPs on a given interface, YES, your RB2011 can support that both on the physical interfaces and on the Bridge interfaces.
You can do everything just multiple dhcp clients on one interface are not possible. As long everything is static, you can set multiple vlans and ip addresses per interface freely.