NETMASK(2) XR32 REFERENCE MANUAL 23/3/2013
COMMAND
NETMASK -- Display / Set Port NETMASK.
SYNOPSIS
NE[tmask] <port> [value]
AVAILABILITY
This command is sysop-only.
DESCRIPTION
This command allows the NETMASK for the specified port to be
displayed or changed.
The NETMASK is used together with the port IP address to
specify the range of IP addresses that are on the same
physical network segment as XR32. If XR32 "overhears" any
datagrams with a destination address within that range, and
not addressed to itself, it will not attempt to route them.
For example, if the NDISXPKT driver is being used, XR32 and
Windows will have different IP addresses, but will share the
same Ethernet address. Thus both XR32 and Windows will "see"
the same datagrams. Without a suitable NETMASK value, XR32
would attempt to route any datagram not addressed to itself,
which means it would attempt to route any datagrams that are
addressed to the Windows IP address.
The netmask is specified in dotted-quad form, for example
"255.255.255.0". Any non-zero bit within the netmask
specifies that the corresponding bit in the IP address should
be non-zero. Any zero bit specifies that the corresponding bit
in the IP address may be zero or one. e.g. if the port IP
address is "192.168.0.11", and the netmask is "255.255.255.0",
XR32 will process datagrams addressed to "192.168.0.11" but
will ignore datagrams addressed to any other 192.168.0.x
destination (where x represents a number between 0 and 255).
The default value for NETMASK is "0.0.0.0", which disables the
function.
The minimum abbreviation for this command is "NE".
OPTIONS
If a single numeric argument is supplied, and it is a valid
port number, the current NETMASK for that port number is
displayed.
If two numeric arguments are supplied, the first specifies a
port number and the second specifies a new NETMASK for that
port.
EXAMPLES
NET 1 - Display current NETMASK for port 1.
NET 2 255.255.255.0 - Set port 2 NETMASK to "255.255.255.0"
NETMASK(2) END OF DOCUMENT
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