Appendix D: Serial Port and Telnet Commands
Netmask Commands
124 | SmartBits 600x/6000x Installation Guide
Netmask Commands
In administering Internet sites, a netmask is a string of 0’s and 1’s that mask or screen out
the network part of an IP address (IP) so that only the host computer part of the address
remains. The binary 1’s at the beginning of the mask turn the network ID part of the IP
address into 0’s. The binary 0’s that follow allow the host ID to remain. The default
netmask is 255.255.255.0 (255 is the decimal equivalent of a binary string of eight ones).
Used for a Class C subnet (one with up to 255 host computers), the “.0” in the
“255.255.255.0” netmask allows the specific host computer address to be visible.
Important: • The following Netmask commands were initially released with the 1.10
firmware. You must have firmware version 1.10 or later installed to be
able to access these commands.
• Resetting the netmask values while other users are connected may cause
those TCP sessions to be disrupted or terminated.
• Netmask definitions are not persistent through a reset until the user
invokes the save command. Typing save at the command prompt will
update the Flash RAM, including the current netmask and gateway
settings.
NETMASK [MASK] – Sets the netmask for the subnet. The NETMASK value uses the
same type of format as an IP address, except that restrictions exist upon its value. For
example, the default value 255.255.255.0 represents a valid netmask, while the value
255.0.255.0 does not. The user-defined gateway will be used to access any IP address that
is not on the chassis’ subnet, where the subnet’s bounds are defined by this netmask. This
command is similar to the one used to display the netmask, except that it includes the
defined mask (which is in the same type format as an IP address).
When issued with no parameters, this command reports the current netmask assignment
defining the chassis subnet. The user-defined gateway(s) will be used when accessing any
IP addresses that are not on the chassis’ subnet (as determined by this netmask).
For the firmware versions prior to 2.00, the netmask could not be directly changed once it
was defined. A specific NETMASK RESET command needed to be issued (see below).
Starting with the 2.00 release, the netmask can be changed at any time.
Note: If the user has not defined a gateway (see “Gateway Commands” on page 125)
prior to the initial definition of the netmask, the firmware will automatically define a
default gateway which is consistent with the chassis’ IP address and netmask. Therefore,
the user needs to define the gateway only if it is different from the default. For example, if
the chassis’ IP address is 192.169.100.24, a netmask of 255.255.255.0 will default to a
gateway of 192.169.100.1.
NETMASK RESET – (Only used for firmware versions prior to 2.00.) Resets the
netmask to 0.0.0.0, allowing a new netmask to be defined by the user.
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