Promax MO-160 Manual De Usuario página 89

USER'S MANUAL. MO-16X
Typically the network administrator will divide the private network into subnets.
For instance, many ADSL home routers use a default address range of 192.168.0.0 to
192.168.0.255.
Class C is the private address range we should usually default to when
connecting the MO-16X to an IP network.
The way the MO-16X operates inside an IP network is configured with the
following three parameters which can be found under the CONFIGURATION menu:
-
IP address. This 4-octet number is the IP address of the modulator
discussed above. By default the value programmed into the modulator is
192.168.29.5.
-
IP mask. The subnet IP mask is used together with the IP address to
determine which part of the address is the network address and which part
is the modulator address. To do this a bitwise AND operation is performed.
Thus the 1's in the IP mask designate the part of the address as being part
of the network portion and the 0's mark the part as being part of the
MO-16X address. For instance, with IP mask 255.255.255.0 we indicate
that the first 24 bits are used as network address. The value programmed
by default is 255.255.255.0. In an alternative form known as Classless Inter-
Domain Routing (CIDR) notation, the default IP address can be also
represented as 192.168.29.5/24.
-
Gateway IP. A gateway is a network node that transfers data between
private networks and other networks (e.g. the Internet), resolving which IP
addresses are part of the private network and which are not. This is the 4-
byte IP address of the gateway and should be only used if the modulator
needs to have access to the Internet or if it is going to be reached by other
equipment outside the private network. The default value is 0.0.0.0 which
stands for NOT USED.
Dynamic addresses cannot be directly selected through the modualtor's menu.
To set up a dynamic address we have to choose a special IP address value with which
we explicitly indicate the dynamic address assignment method we want to use. For this
purpose, octets 1, 2 and 4 are all set to 0. Octet 3 controls whether we want to use
BootP, DHCP, AutoIP or a combination of the three. If the third octet is 0 then all three
methods are enabled at the same time. To disable any one of them we have to assert
the corresponding bit (bit 0 for AutoIP, bit 1 for DHCP and bit 2 for BootP). Thus, for
instance, if it is only DHCP that we want to enable (as it typically occurs in practice) the
IP address we have to programme into the modulator is 0.0.5.0.
It is not advisable to disable all dynamic address assignment methods (0.0.7.0)
since this would make the process of assigning a dynamic IP address to the MO-16X
really difficult.
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