5.4 DHCP server
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The following columns are hidden by default:
•Last Request Time — date and time when the recent request for a lease or lease
extension was sent by a client
•Lease Remaining Time — time remaining until the appropriate Lease Expiration
Use the Release button to release a selected IP address immediately (independently of
its status). Released addresses are considered free and can be assigned to other clients
immediately.
Click on the Reserve button to reserve a selected (dynamically assigned) IP address based
on the MAC address or name of the host that the address is currently assigned to. The
Scopes tab with a dialog where the appropriate address can be leased will be opened
automatically. All entries except for the Description item will be already defined with
appropriate data. Define the Description entry and click on the OK button to assign a
persistent lease for the IP address of the host to which it has been assigned dynamically.
Note: The MAC address of the host for which the IP is leased will be inserted to the
lease reservation dialog automatically. To reserve an IP address for a hostname, change
settings of the Reservation For and Value items.
DHCP server — advanced options
Other DHCP server parameters can be set in the Options tab.
BOOTP
If this option is enabled, the DHCP server will assign IP addresses (including op-
tional parameters) also to clients of BOOTP protocol (protocol used formerly to
DHCP— it assigns configurations statically only, according to MAC addresses).
Windows RAS
Through this option you can enable DHCP service for RAS clients (Remote Access
Service). You can also specify time when the service will be available to RAS clients
(an IP address will be assigned) if the default value is not convenient.
Warning:
1. DHCP server cannot assign addresses to RAS clients connecting to the RAS
server directly at the WinRoute host (for technical reasons, it is not possible to
receive DHCP queries from the local RAS server). For such cases, it is necessary
to set assigning of IP addresses in the RAS server configuration.
2. The RAS service in Windows leases a new IP address for each connection (even
if requested by the same client). WinRoute includes RAS clients in total number
of clients when checking whether number of licensed users has been exceeded
(see chapter 4.6). This implies that repeated connection of RAS clients may