vlan with dhcp server

RouterOS General
1

Hi guys,
I’m trying to config dhcp server with vlan on RB951UI.
Here is my config.
/interface vlan

#    NAME                     MTU ARP        VLAN-ID INTERFACE                                     
   R  vlan40                  1500 enabled         40 ether5

/ip address

 #   ADDRESS            NETWORK         INTERFACE                                                                   
 3 D 50.0.0.3/24        50.0.0.0        ether1                                                                      
 5   40.0.0.1/24        40.0.0.0        vlan40

/ip dhcp-server

 #   NAME       INTERFACE     RELAY           ADDRESS-POOL     LEASE-TIME ADD-ARP       
     vlan40     vlan40                        vlan40           10m

I want my pc receive ip from vlan40 when i connect it using lan cable. But it’s not worked. Did i do something wrong ?
Any ideas is helpful. Thanks in advance.

2

Is your PC connected to vlan40?
Is it on a port that is sending vlan40 untagged or did you put some switch between them to remove the tag?
If not, this is not going to work.

3

my pc connected to ether5 which has vlan40 on it. Yeah i think it’s untagged. Can i remove the tag using only 1 router not adding one more switch ??

4

Show your config for ether5 and the VLAN.

5

my config on ether5 and vlan is exactly like my 1st post.
Interface vlan40 add to ether5 and i created dhcp server for vlan40.

6

Unless your PC is using inserting Vlan Tags it will be looking for DHCP on ether5.

Use the Torch function with all options enabled (in Winbox) and a timeout of 30 seconds and see whether dhcp request are being tagged or not.

You can also take a spare Mikrotik and add your vlan40 to ether1 and then bridge vlan40 to a spare ethernet port for the PC. Plug this spare routers ether1 into you first routers ether5 and it should work.

7

Ahh… overlooked that.
In this case it is normal that it does not work, a PC will not use VLAN tagging by itself unless you
configure it to do so, which is normally not possible in Windows. (it requires a server-grade ethernet card)

On Linux it is possible by creating a vlan40 interface just like on the MikroTik.