User`s guide

Remarks
The assigned DNS address is used for the DNS server if DHCP is disabled or
unavailable. Otherwise, the DNS server address is auto-assigned by DHCP.
Dot-notation addresses ("nnn.nnn.nnn.nnn" where "nnn" is a byte value)
must be expressed with care, as most web software on the PC 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 34410A/11A/L4411A 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 an IP address 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 PC web software to address the instrument. Do not use
"255.255.020.011" – the PC will interpret this address differently due to
the leading zeros.
The DNS address 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).