FAQs from Rohde & Schwarz

Scope Rider answers to a IP address which has not been entered

Question

I am using a static LAN connection. The IP address which has been entered is 192.168.0.074. But the scope rider does not answer at that address. I have found it at 192.168.0.60. What is wrong here?

Answer

IP addresses can be entered in binary, octal, decimal and hexadecimal representation. A leading (i.e. at the first place or directly after one of the three dots) "0" leads to octal interpretation of the following digits until the next dot (or, after the third dot, until the end of the address).

Hence, in case of IP addresses "074" is not equal to "74". "074" will be interpreted as [74]octal = [60]decimal (as 7*8+4=56+4=60). "74" will be interpreted as [74]decimal. So the IP settings works according to specification of the Internet Protocol.

Please change the entry to 192.168.0.74 (remove the "leading 0"). Then the scope rider will answer at that address.