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Description of the menu options
ELSA MicroLink Cable
R102
Off: The device does not operate as a DHCP server.
Auto: The device regularly checks whether there is another DHCP server in the LAN. If
not, it operates as a DHCP server and issues IP addresses to local clients.
If there is no cable or LAN-IP address entered in the TCP/IP module (e.g. factory setting),
the cable modem will issue IP addresses from the address range 10.0.0.2 - 10.0.0.253 to
all DHCP clients in auto mode.
Start-address-
pool
End-address-
pool
The IP address assigned is taken from the address pool selected ('Start-address-pool' to
'End-address-pool'). Any valid addresses in the local network can be entered here.
If 0.0.0.0 is entered instead, the device will determine the appropriate addresses (start
or end) from the settings under 'Setup/TCP module'. The procedure is as follows:
If only the cable or LAN-IP address is entered, the start or end of the pool is
determined by means of the associated network mask.
If both addresses have been specified, the LAN-IP address has priority for
determining the pool.
The start address of the pool is either the address given in the DHCP module or the
first valid address in the local network.
The end address of the pool is either the address given in the DHCP module or the
last valid address in the local network.
A valid address is then taken from the IP address pool. If the computer was already
assigned an IP address at some point in the past, it requests this same address and the
DHCP server attempts to reassign this address if it has not already been assigned to
another computer.
The DHCP server also checks whether the address that is to be assigned to the computer
is unique in the local network. It does this by issuing an ARP request to the address. If
the ARP request is answered, the DHCP server begins the procedure again with a new
address. As soon as the uniqueness of an address has been established, the requesting
computer is assigned the address found.
Netmask
The network mask is assigned in the same way as the IP address:
The system either assigns the network mask entered in the DHCP module or uses the
network mask that belongs to the local network (determined during address assignment).
Broadcast
The broadcast address is assigned in the same way as the IP address:
The system either assigns the broadcast address entered in the DHCP module or uses the
broadcast address that belongs to the local network (determined during address
assignment).
Max.-lease-
time-minute(s)
Here you can enter the maximum period of validity that the DHCP server assigns a host.
The DEFAULT value of 6000 minutes equals approximately 4 days.