Agilent Technologies Switch/Measure manual Subnet Mask

Features and Functions 2

Front Panel Operation:

Utility > REMOTE I/O > LAN > LAN SETTINGS > MODIFY > DHCP OFF > AUTO IP

Remote Interface Operation:

SYSTem:COMMunicate:LAN:AUTOip (OFFON}

Subnet Mask

The instrument uses the Subnet Mask to determine if a client IP address is on the same local subnet. When a client IP address is on a different subnet, all packets must be sent to the Default Gateway. Contact your network administrator to determine if subnetting is being used and for the correct Subnet Mask.

If you change the Subnet Mask, you must cycle power on the 34980A to activate the setting.

•The default Subnet Mask for the 34980A is “255.255.0.0”.

•If DHCP is enabled, the specified Subnet Mask is not used. However, if the DHCP server fails to assign a valid IP address, the currently configured Subnet Mask 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 Subnet Mask 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 the computer will interpret this address differently due to the leading zeros.

•A value of “0.0.0.0” or “255.255.255.255” indicates that subnetting is not being used.

•The Subnet Mask 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).

34980A User’s Guide 79