Nice to know my site is appreciated–by those who are in the know: technical support representatives. Here is a note we got just a couple of days ago from a technical support rep:
I work for a technical support group for [well-known IT company]. Generally, we create our own adhocs and have found this site to be very useful in educating the customers. It [InetDaemon.Com] is much more precise and easier to understand than our own site.
Easier to understand than the company’s own support website? Impressive, don’t you think?
Now, I could disclose who this company is (their global headquarters are in the U.S.). Rest assured though, that if you have called anybody for technical support, you just might have talked to one of their people and one of their people may have provided an answer they got from InetDaemon.Com. When IT Pros turn to this support company, this company’s personnel turn to InetDaemon.com.
I am, after all, the guy ‘geeks’ call for technical support.
Now you know why InetDaemon.Com should be one of your first choices for technical education.
I have updated the Wide Area Network (WAN) tutorial under our Networking section. Enjoy!
Time for another question from the mailbag:
Why is the Loopback address always in the range of 127.0.0.0 to 127.255.255.255 ?
This range of IP addresses is reserved by the Internet Assigned Names Authority (IANA) for use as the Internet host loopback address. All Internet connected hosts (hosts running Internet Protocol) can use this adress for local loopback processing. This address range is typically used for special purposes such as testing the network interfaces and the network software.
A ping sent to any address should always work if at least one interface is enabled. Here is an example of what happens on a Windows XP host when you ping an address in the 127.0.0.0 – 127.255.255.255 range:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\inetdaemon>ping 127.127.127.127
Pinging 127.127.127.127 with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time=-63ms TTL=128
Reply from 127.0.0.1: bytes=32 time=-63ms TTL=128
Reply from 127.0.0.1: bytes=32 time=63ms TTL=128
Ping statistics for 127.127.127.127:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = -63ms, Average = 1073741808ms
The current list of reserved blocks of IP address space and their designated use are listed in RFC 3330 and RFC 1918.
Cisco routers have a virtual loopback interface and this should not be confused with the loopback address, even though the loopback address can be used on the Cisco loopback interface.
There were several questions I wanted answers to when I started using AdSense:
Here is what I found…