Using DHCP Relay

RouterOS General
1

I have a network set up where there is ‘main’ router connected to fiber. This is a CCR2116-12G+4S. WAN IP=XXX.XXX.XXX.XXX (Fiber). LAN Bridge IP=10.0.247.254/24.

Connected to the LAN Bridge of this main router are additional routers (RB4011). WAN IP=Static 10.0.247.XXX (such as .101). LAN IP Bridge=Static 10.x.x.x (such as 10.1.1.254/24).

So the RB4011 LAN Bridge is double-natted, which is fine. The RB4011 also hands out DHCP addresses in the range of 10.x.1.x (such as 10.1.1.1) on its LAN Bridge, so that devices connected to the RB4011 LAN Bridge can get a DHCP address.

I would like to have the CCR2116 hand out DHCP addresses, rather than the RB4011.

Is it possible to set up the CCR2116 as a DHCP server and then ‘pass through’ the DHCP address through the RB4011 to a device connected to the RB4011 LAN Bridge, by setting up a DHCP Relay in the RB4011?

Fiber—>CCR2116 WAN Port
CCR2116 LAN Bridge—>RB4011 WAN Port
CCR2116 DHCP Server on LAN Bridge.
RB4011 DHCP Relay allows DHCP from CCR2116 LAN Bridge to be sent to device connected to RB4011 LAN Bridge.

John Rayfield, Jr.
Rayfield Communications

2

It seems to me that what you want is exactly like the example given in :
https://help.mikrotik.com/docs/display/ROS/DHCP#DHCP-DHCPRelay
(it has two DHCP servers and relays, but you need only one).

3

This is the hardware configuration that I’m using (except that I actually have more than 2 routers coming off of the ‘main’ router - I was just using one router to keep things simple for now so that I could better understand how to set this up.

So I’m confused as to how to set up some of the IP addressing on the routers.

Here’s a diagram of how I have ip addressing set up now, and what I want to achieve:
DHCP_Static-IP_Main-Router.jpg