<td>List of DHCP servers' IP addresses which should the DHCP requests be forwarded to</td>
|type=yes {{!}} no
</tr>
|default=no
<tr>
|desc=Adds DHCP relay agent information if enabled according to RFC 3046. Agent Circuit ID Sub-option contains mac address of an interface, Agent Remote ID Sub-option contains MAC address of the client from which request was received.
<td>The unique IP address of this DHCP relay needed for DHCP server to distinguish relays. If set to <b>0.0.0.0</b> - the IP address will be chosen automatically</td>
|default=none
</tr>
|desc=If secs field in DHCP packet is smaller than delay-threshold, then this packet is ignored
|desc=List of DHCP servers' IP addresses which should the DHCP requests be forwarded to
}}
{{Mr-arg-table
|arg=interface
|type=string
|default=
|desc=Interface name the DHCP relay will be working on.
}}
{{Mr-arg-table
|arg=local-address
|type=IP
|default=0.0.0.0
|desc=The unique IP address of this DHCP relay needed for DHCP server to distinguish relays. If set to '''0.0.0.0''' - the IP address will be chosen automatically
}}
{{Mr-arg-table
|arg=relay-info-remote-id
|type=string
|default=
|desc=specified string will be used to construct Option 82 instead of client's MAC address. Option 82 consist of: interface from which packets was received + client mac address or '''relay-info-remote-id'''
}}
{{Mr-arg-table-end
|arg=name
|type=string
|default=
|desc=Descriptive name for the relay
}}
<p>
DHCP relay does not choose the particular DHCP server in the dhcp-server list, it just send the incoming request to all the listed servers.
DHCP relay does not choose the particular DHCP server in the dhcp-server list, it just send the incoming request to all the listed servers.
</p>
<h2>Example setup</h2>
==Example setup==
<p>
Let us consider that you have several IP networks 'behind' other routers, but you want to keep all DHCP servers on a single router. To do this, you need a DHCP relay on your network which relies DHCP requests from clients to DHCP server.
Let us consider that you have several IP networks 'behind' other routers, but you want to keep all DHCP servers on a single router. To do this, you need a DHCP relay on your network which relies DHCP requests from clients to DHCP server.
</p>
<p>
This example will show you how to configure a DHCP server and a DHCP relay which serve 2 IP networks - 192.168.1.0/24 and 192.168.2.0/24 that are behind a router DHCP-Relay.
This example will show you how to configure a DHCP server and a DHCP relay which serve 2 IP networks - 192.168.1.0/24 and 192.168.2.0/24 that are behind a router DHCP-Relay.
DHCP Relay is just a proxy that is able to receive a DHCP request and resend it to the real DHCP server.
Properties
Sub-menu:/ip dhcp-relay
Property
Description
add-relay-info (yes | no; Default: no)
Adds DHCP relay agent information if enabled according to RFC 3046. Agent Circuit ID Sub-option contains mac address of an interface, Agent Remote ID Sub-option contains MAC address of the client from which request was received.
delay-threshold (time | none; Default: none)
If secs field in DHCP packet is smaller than delay-threshold, then this packet is ignored
dhcp-server (string; Default: )
List of DHCP servers' IP addresses which should the DHCP requests be forwarded to
interface (string; Default: )
Interface name the DHCP relay will be working on.
local-address (IP; Default: 0.0.0.0)
The unique IP address of this DHCP relay needed for DHCP server to distinguish relays. If set to 0.0.0.0 - the IP address will be chosen automatically
relay-info-remote-id (string; Default: )
specified string will be used to construct Option 82 instead of client's MAC address. Option 82 consist of: interface from which packets was received + client mac address or relay-info-remote-id
name (string; Default: )
Descriptive name for the relay
DHCP relay does not choose the particular DHCP server in the dhcp-server list, it just send the incoming request to all the listed servers.
Example setup
Let us consider that you have several IP networks 'behind' other routers, but you want to keep all DHCP servers on a single router. To do this, you need a DHCP relay on your network which relies DHCP requests from clients to DHCP server.
This example will show you how to configure a DHCP server and a DHCP relay which serve 2 IP networks - 192.168.1.0/24 and 192.168.2.0/24 that are behind a router DHCP-Relay.
IP Address Configuration
IP addresses of DHCP-Server:
[admin@DHCP-Server] ip address> print
Flags: X - disabled, I - invalid, D - dynamic
# ADDRESS NETWORK BROADCAST INTERFACE
0 192.168.0.1/24 192.168.0.0 192.168.0.255 To-DHCP-Relay
1 10.1.0.2/24 10.1.0.0 10.1.0.255 Public
[admin@DHCP-Server] ip address>
IP addresses of DHCP-Relay:
[admin@DHCP-Relay] ip address> print
Flags: X - disabled, I - invalid, D - dynamic
# ADDRESS NETWORK BROADCAST INTERFACE
0 192.168.0.2/24 192.168.0.0 192.168.0.255 To-DHCP-Server
1 192.168.1.1/24 192.168.1.0 192.168.1.255 Local1
2 192.168.2.1/24 192.168.2.0 192.168.2.255 Local2
[admin@DHCP-Relay] ip address>
DHCP Server Setup
To setup 2 DHCP Servers on DHCP-Server router add 2 pools. For networks 192.168.1.0/24 and 192.168.2.0:
/ip pool add name=Local1-Pool ranges=192.168.1.11-192.168.1.100
/ip pool add name=Local1-Pool ranges=192.168.2.11-192.168.2.100
[admin@DHCP-Server] ip pool> print
# NAME RANGES
0 Local1-Pool 192.168.1.11-192.168.1.100
1 Local2-Pool 192.168.2.11-192.168.2.100
[admin@DHCP-Server] ip pool>
