The maximum number of lease that can be distributes is 250. If you want to increase, you have to
add the following command in the configuration:
set dhcp-server LAN0 directive max_leases 500
makes the router to check if the selected address is really free before releasing the lease, so it send
an ARP Request packet to the neighbor and if it doesn‟t get an answer, it proceeds assigning the
lease. It is possible to change the timeout by:
set dhcp-server LAN0 arpping-timeout 200
MAC ADDRESS CONTROL
It is possible to specify if the DHCP process must ignore the requests from a particular MAC and
vice versa, if it must accept the request coming from one or more prearranged MAC only:
set dhcp-server <name> ignore-mac <mac-address>
set dhcp-server <name> accept-mac <mac-address>
The command can be repeat for each MAC pondered.
The 'XX' in the MAC address is used as wildcard character to specify any value, in order to identify a
group of MAC address. For example, using the notation:
set dhcp-server <name> accept-mac 00:0D:5A:XX:XX:XX
you identify every Tiesse MAC address.
The sequence of characters 'XX' is significant only at the end of the sequence.
This function is particularly useful when, on the same network, there are devices that need to
receive different configurations, for example, when you want to distinguish between PCs and
telephones. For example:
set dhcp-server <name> no-ignore-mac <mac-address>
set dhcp-server <name> no-accept-mac <mac-address>
DHCP SERVICE’S MULTIPLE INSTANCES
By using the commands shown in the previous section, you can enable multiple instances of the
DHCP protocol and configure each one separately, using as usual commands with the syntax:
set dhcp-server <name> <options>
where <name> is an instance identifier and <options> are the parameters that relate to
that instance.
This feature is particularly useful in case VLANs are configured on the router and you want to
activate the service on all of them, or even in the general case in which you want to configure the
dhcp-server on different interfaces.
For example, suppose that there are three VLAN identified as eth1.10, eth1.20 and eth1.30, having
IP addresses respectively: 172.16.1.1/24, 172.16.2.1/24 and 172.16.3.1/24. To enable the
dhcp-server on each of them, using the following set of commands:
set dhcp-server vlan10 interface eth1.10
set dhcp-server vlan10 start-range 172.16.1.50
set dhcp-server vlan10 end-range 172.16.1.100
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