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80 34980A User’s Guide
2 Features and Functions
Front Panel Operation:
Utility > REMOTE I/O > LAN > LAN SETTINGS > MODIFY > DHCP OFF >
AUTO IP OFF > . . . SUBNET MASK
Remote Interface Operation:
SYSTem:COMMunicate:LAN:SMASk <mask>
Default Gateway
A Default Gateway address allows the instrument to communicate with
systems that are not on the local subnet. Thus, this is the Default Gateway
where packets are sent which are destined for a device not on the local
subnet, as determined by the Subnet Mask setting. Contact your network
administrator to determine if a gateway is being used and for the
correct address.
If you change the Default Gateway, you must cycle power on the 34980A
to activate the new setting.
• The default for the 34980A is “0.0.0.0” (no gateway, and subnetting is
not being used).
• If DHCP is enabled, the specified Default Gateway is not used.
However, if the DHCP server fails to assign a valid IP address,
the currently configured Default Gateway will be used.
• Dot-notation addresses (“nnn.nnn.nnn.nnn” where “nnn” is a byte
value) must be expressed with care, as most web software on the
computer will interpret byte values with leading zeros as octal numbers.
For example, “255.255.020.011” is actually equivalent to decimal
“255.255.16.9” not “255.255.20.11” because “.020” is interpreted as “16”
expressed in octal, and “.011” as “9”. To avoid confusion, use only
decimal expressions of byte values (0 to 255), with no leading zeros.
For example, the 34980A assumes that all dot-notation addresses are
expressed as decimal byte values and strips all leading zeros from these
byte values. Thus, attempting to set a Default Gateway of
“255.255.020.011” will become “255.255.20.11” (a purely decimal
expression). Be sure to enter the exact expression, “255.255.20.11”, in
your computer web software to address the instrument. Do not use
“255.255.020.011” — the computer will interpret this address differently
due to the leading zeros.
• The Default Gateway is stored in non- volatile memory, and does not
change when power has been off, after a Factory Reset (
*RST
command), or after an Instrument Preset (SYSTem:PRESet command).