DHCP server for multiple subnets in bonding interface.

RouterOS Beginner Basics
1

Hello.

Maybe this is a silly question, but I’m not able to solve this with Mikrotik.

I have a Dell switch configured with multiple vlans connected to each classroom. On each vlan configuration in the Dell switch I have the ip-helper-address pointing to my router 10.0.0.1, that allows each client in each classroom to get IP address from the central DHCP server.

Actually the router is running Debian and I have a DHCP server with multiple subnets and different hosts with static IP address on each subnet. Everything has been working ok all these years, but I’m moving everything to a new Mikrotik router CCR1072-1G-8S+ with OS 7.10.1 version and I’m not able to configure the same functionality.

In the Mikrotik I have a bonding interface INTRANET which is connected to the Dell switch.

/ip/address/print
# ADDRESS            NETWORK         INTERFACE
0 10.0.0.9/16        10.0.0.0        ether1   
1 10.0.0.1/16        10.0.0.0        INTRANET

I have configured in the DHCP Server the different networks for each classrom, with the IP address of each VLAN gateway:

# ADDRESS        GATEWAY       DNS-SERVER  DOMAIN           
 0 10.0.0.0/16    10.0.0.254    10.0.4.1    ente.local
 1 10.1.0.0/16    10.1.0.254    10.0.4.1    ente.local
 2 10.11.0.0/16   10.11.0.254   10.0.4.1    ente.local
 3 10.12.0.0/16   10.12.0.254   10.0.4.1    ente.local
 4 10.13.0.0/16   10.13.0.254   10.0.4.1    ente.local
 5 10.21.0.0/16   10.21.0.254   10.0.4.1    ente.local
 6 10.22.0.0/16   10.22.0.254   10.0.4.1    ente.local
 7 10.23.0.0/16   10.23.0.254   10.0.4.1    ente.local
 8 10.24.0.0/16   10.24.0.254   10.0.4.1    ente.local

I also have the IP pool address, example:

 #  NAME              RANGES                   
 0  Aula01            10.1.0.50-10.1.0.90      
 1  Aula11            10.11.0.50-10.11.0.90    
 2  Aula12            10.12.0.50-10.12.0.90    
 3  Aula13            10.13.0.50-10.13.0.90    
 4  Aula21            10.21.0.50-10.21.0.90

I also have some leases created.

Questions:

  • How can I create the dhcp server in the 10.0.0.1 for each subnetwork?
  • Should I create multiple dhcp servers and modifiy the ip-helper-address of each VLAN acordingly?

Thank you very much for your help, I really appreciate it.

2

Hi.

I would go this way:

  1. configure all vlans on the router (under bonding interface or get rid of bonding and make them directly under physical interface on which Dell is connected),
  2. add gateway addresses for all vlans on the router,
  3. configure DHCP pools and servers for all vlans (router),
  4. change Dell port to trunk and tag all vlans (if it is not done this way right now) - port connected to router,
  5. on Dell change the vlans configuration to point out VLAN gateway - I’m not familiar with Dell switches, but I think it should work out even without this ip-helper at all.