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124 AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
RouterOS v3 Configuration and User Guide
Property Description
code (integer: 1..254) - dhcp option code. All codes are available at
http://www.iana.org/assignments/bootp-dhcp-parameters
name (name) - descriptive name of the option
value (text) - parameter's value in form of a string. If the string begins with "0x", it is assumed as a
hexadecimal value
The defined options you can use in /ip dhcp-server network submenu
According to the DHCP protocol, a parameter is returned to the DHCP client only if it requests this
parameter, specifying the respective code in DHCP request Parameter-List (code 55) attribute. If the
code is not included in Parameter-List attribute, DHCP server will not send it to the DHCP client.
Example
This example shows how to set DHCP server to reply on DHCP client's Hostname request (code 12)
with value Host-A.
Add an option named Option-Hostname with code 12 (Hostname) and value Host-A:
[admin@AT-WR4562] ip dhcp-server option> add name=Hostname code=12 \
value="Host-A"
[admin@AT-WR4562] ip dhcp-server option> print
# NAME CODE VALUE
0 Option-Hostname 12 Host-A
[admin@AT-WR4562] ip dhcp-server option>
Use this option in DHCP server network list:
[admin@AT-WR4562] ip dhcp-server network> add address=10.1.0.0/24 \
\... gateway=10.1.0.1 dhcp-option=Option-Hostname dns-server=159.148.60.20
[admin@AT-WR4562] ip dhcp-server network> print detail
0 address=10.1.0.0/24 gateway=10.1.0.1 dns-server=159.148.60.20
dhcp-option=Option-Hostname
[admin@AT-WR4562] ip dhcp-server network>
Now the DHCP server will reply with its Hostname Host-A to DHCP client (if requested)
6.1.9 DHCP Relay
Submenu level: /ip dhcp-relay
Description
DHCP Relay is just a proxy that is able to receive a DHCP request and resend it to the real DHCP
server
Property Description
delay-threshold (time; default: none) - if secs field in DHCP packet is smaller than delay-threshold, then
this packet is ignored
dhcp-server (text) - list of DHCP servers' IP addresses which should the DHCP requests be forwarded
to
interface (name) - interface name the DHCP relay will be working on
local-address (IP address; default: 0.0.0.0) - the unique IP address of this DHCP relay needed for DHCP
server to distinguish relays:
0.0.0.0 - the IP address will be chosen automatically
name (name) - descriptive name for relay
DHCP relay does not choose the particular DHCP server in the dhcp-server list, it just sent to all the
listed servers.