Mikrotik dhcp relay setup

If for no other reason then to be able to test the customer access with a tech port. Unless you need peer-to-peer communication, it is recommended to set the bridge horizons to isolate the customer interfaces on your customer access router.

Bridge port horizons work well to keep the software bridges from broadcasting between customer access ports on your customer gateway but they require CPU processing of the packet so they are not desirable for MikroTik switches. I encourage using a management VLAN.

I recommend that your infrastructure is inaccessible from the internet and from your customers. In my opinion, management should be available by physically plugging into the management interface on your router or using a VPN to login to your management network.

Using a management VLAN can mean losing administrative access to the equipment from the LAN port with some equipment Cambium manufacturer that has addressed this by using If local administration is not possible for a disconnected device then resetting the device to defaults and re-configuring it may be required.

VLAN tags remain on frames until a switch or router removes them. Network segmentation of your management VLAN is recommended per site. To configure the DHCP server manually to respond to local requests you have to configure the following:. Let us consider that you have several IP networks 'behind' other routers, but you want to keep all DHCP servers on a single router.

For networks Pages Blog. Page tree. Browse pages. A t tachments 1 Page History. Jira links. IP addresses assigned statically are not probed! If set to static-only , then only the clients that have a static lease added in lease submenu will be allowed. Will add additional load on L2 network. Note that this setting should not be used in relay setups.

If the option is enabled, then whenever the server tries to assign a lease it will send ICMP and ARP messages to detect whether such address in the network already exists.

If any of the above get reply address is considered already used. Conflict detection must be disabled when any kind of DHCP client limitation per port or per mac is used. Internal "global" variables that can be used in the script: leaseBound - set to "1" if bound, otherwise set to "0" leaseServerName - DHCP server name leaseActMAC - active mac address leaseActIP - active IP address lease-hostname - client hostname lease-options - an array of received options lease-time time ; Default: 10m The time that a client may use the assigned address.

The client will try to renew this address after half of this time and will request a new address after the time limit expires. If there is only one static address on the DHCP server interface and the source address is left as 0. If there are multiple addresses on the interface, an address in the same subnet as the range of given addresses should be used.

DHCP Option capwap will be used. If set to '0' - netmask from network address will be used. Property Description code integer No labels. Powered by Atlassian Confluence 7. Whether to add dynamic ARP entry. IP pool, from which to take IP addresses for the clients. Always send replies as broadcasts even if the destination IP is known. Accepts two predefined options or time value: forever - lease never expires lease-time - use time from lease-time parameter.

Specifies whether to limit a specific number of clients per single MAC address or leave unlimited. Image showing a dhcp relay behind a dhcp server. As can be seen in the diagram above, the dhcp server is on the same network with the dhcp relay while the dhcp clients are not on the same network as the dhcp server.

The dhcp relay, in turn, is on the same network with the hosts. When a dhcp request is sent from network hosts, the dhcp relay receives it and forwards the request to the dhcp server. Well, in a nutshell, a dhcp relay agent is used to forward dhcp requests and replies between a dhcp server and clients who are not on the same subnets. In this demonstration, I will configure a dhcp server for the two LAN subnets attached to the dhcp relay. Here is how it is done.

First, IPs have to be assigned to the interface connecting to the dhcp-relay as shown below. Now, we specify the pools for the two networks connected the dhcp-relay. See below:. Finally, we set up a relay agent on the dhcp-relay device.