Hello
I’m in trouble making up LAN in my association. Our plans are represented in figure:
- first we must take internet from a repeater. A DHCP server is provided there and can’t turned off;
- then we desire to divide LAN with a mini computer that acts as our own DHCP server, proxy and cache system.
- at this point we have the clients, both LAN and WLAN.

We have available a Microtik Routerboard 433RL (with 2 wireless card) and a Allied Telesyn managed switch (yeah, it’s old stuff, but we try with it).
The main problem regards the mini computer: it has only an ethernet port. Has been suggested to split the ethernet port using VLAN: for instance using untagged packages when mini computer wants to talk to the outside, while tagged with ID 100 when it want to talk to the inside. The same configuration must be done on the MikroTik:
/interface vlan add vlan-100 vlan-id=100
So I bridged vlan-100 with other inside interfaces, and ether2 with outside ones.
/interface bridge add inside
/interface bridge add outside
/interface bridge port add inside interface=vlan-100
/interface bridge port add inside interface=wlan1
/interface bridge port add inside interface=ether1
/interface bridge port add outside interface=ether2
/interface bridge port add outside interface=wlan2
wlan 2 was configured as station pseudobridge, while wlan 1 as ap bridge. Both bridges has an IP (for the outside I used DHCP client, and it takes correctly IP).
/ip address add address=192.168.5.3/24 interface=inside network= 192.168.5.0
/ip dhcp-client add interface=outside
Minicomputer can talk with outside and go in internet (but it can’t take address from main router’s DHCP, not even configuring a DHCP relay).
Dialog on tagged interface doesn’t work.
Is something misconfigured?