User`s guide

152
• Logical Ethernet Interfaces
• DHCP Options
• Static Lease Reservations
DHCP Server for Ethernet n
Configuration – Network > DHCP Server> DHCP Server for Ethernet n
Enable DHCP Server
When checked, this checkbox opens up the page to reveal the following parameters:
IP Addresses a.b.c.d to a.b.c.d
There are six text boxes in this part of the page; three rows of two. The values in these
specify the starting and ending addresses for the range of IP addresses that will be handed
out by the DHCP server. Each of the three rows can be used to specify a different IP address
pool, all pools should be within the same subnet. When the minimum IP address text box is
clear, the DHCP service will be disabled. In other words, in order to enable the DHCP
service, there must be at least one minimum IP address and a range.
Using the CLI, this is specified slightly differently, a starting address and a range are
specified instead.
Mask
The value in this text box specifies the subnet mask used to on the network to which the
router is connected.
Gateway
A gateway is required in order to route data to IP addresses that are not on the local
subnet. The value in this text box specifies the IP address of the gateway (which is usually
the IP address of the router itself as configured by the IP address of the Ethernet interface
associated with this DHCP instance). Alternatively, this may be set to the IP address of
another router on the LAN.
DNS Server
The value in this text box specifies the IP address of the primary DNS server to be used by
clients on the LAN. This will usually be the IP address of the route itself. Alternatively, this
may be set to the IP address of an alternative DNS server on the LAN.
Secondary DNS Server
The value in this text box specifies the IP address of a secondary DNS server (if available)
to be used by DHCP clients on the LAN.
Domain Name
The value in this text box specifies the domain name which will be returned to clients.
Lease Duration d days h hrs m mins
The values in these three text boxes specify how long a DHCP client may use the assigned
IP address before it must renew its configuration with the DHCP server. When configuring
this value using the command line interface be aware that this parameter is specified in
minutes. The three boxes here are for convenience when using long lease durations.
Wait for s milliseconds before sending DHCP offer reply
When the checkbox box is checked, the router will use the value in the text box as the delay
to use prior to sending out the DHCP_OFFER message. Enabling this functionality and
setting the delay to a non-zero value will allow other DHCP servers on the network to
respond first.
Only send offers to Wi-Fi clients