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120 AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
RouterOS v3 Configuration and User Guide
the source-address is left as 0.0.0.0, then the static address will be used. If there are multiple addresses
on the interface, an address in the same subnet as the range of given addresses should be used
use-radius (yes | no; default: no) - whether to use RADIUS server for dynamic leases
Client will only receive a DHCP lease in case it is directly reachable by its MAC address through that
interface (some wireless bridges may change client's MAC address).If authoritative property is set to
yes, the DHCP server is sending rejects for the leases it cannot bind or renew. It also may (although not
always) help to prevent the network users to run their own DHCP servers illicitly, disturbing the proper
way the network should be functioning.If relay property of a DHCP server is not set to 0.0.0.0 the
DHCP server will not respond to the direct requests from clients.
Example
To add a DHCP client on ether1 interface:
/ip dhcp-server add name=dhcp-office disabled=no
[admin@AT-WR4562] ip dhcp-server> print detail
Flags: X - disabled, I – invalid
0 interface=ether1 add-default-route=yes use-peer-dns=yes use-peer-ntp=yes
status=bound address=192.168.0.65/24 gateway=192.168.0.1
dhcp-server=192.168.0.1 primary-dns=192.168.0.1 primary-ntp=192.168.0.1
expires-after=9m44s
dhcp-clients 02:00:00
[admin@AT-WR4562] ip dhcp-server>
Client will only receive a DHCP lease in case it is directly reachable by its MAC address through that
interface (some wireless bridges may change client's MAC address).If authoritative property is set to
yes, the DHCP server is sending rejects for the leases it cannot bind or renew. It also may (although not
always) help to prevent the network users to run their own DHCP servers illicitly, disturbing the proper
way the network should be functioning.If relay property of a DHCP server is not set to 0.0.0.0 the
DHCP server will not respond to the direct requests from clients.
Example
To add a DHCP server to interface ether1, lending IP addresses from dhcp-clients IP pool for 2 hours:
/ip dhcp-server add name=dhcp-office disabled=no address-pool=dhcp-clients \
interface=ether1 lease-time=2h
[admin@AT-WR4562] ip dhcp-server> print
Flags: X - disabled, I – invalid
# NAME INTERFACE RELAY ADDRESS-POOL LEASE-TIME ADD-ARP
0 dhcp-office ether1 dhcp-clients 02:00:00
[admin@AT-WR4562] ip dhcp-server>
6.1.4 Store Leases on Disk
Submenu level: /ip dhcp-server config
Description
Leases are always stored on disk on graceful shutdown and reboot. If on every lease change it is stored
on disk, a lot of disk writes happen. There are no problems if it happens on a hard drive, but is very bad
on Compact Flash (especially, if lease times are very short). To minimize writes on disk, all changes are
flushed together every store-leases-disk seconds. If this time will be very short (immediately), then no
changes will be lost even in case of hard reboots and power losts. But, on CF there may be too many
writes in case of short lease times (as in case of hotspot). If this time will be very long (never), then there
will be no writes on disk, but information about active leases may be lost in case of power loss. In these
cases dhcp server may give out the same ip address to another client, if first one will not respond to ping
requests.