Take the 2-minute tour ×  I do know that ~ are the loopback IP
addresses for most modern operating systems and we could use
these IP addresses to refer to our own computer.  But what's It
seems it also refers to the local computer, then what's the
difference?  And could you explain the following ip connections
for me: alt text  share|improve this question Might find this
question interesting as it is partially related:
stackoverflow.com/questions/113238/… –  username Oct 25 '09 at
8:35 @username:Thanks for the clue. –  Jichao Oct 25 '09 at 8:40
Also have a look at this question, as it gives details as to
what is (and isn't): serverfault.com/questions/228629/… –  Ellie
Kesselman Aug 12 '11 at 4:25  4 Answers 4  up vote 51 down vote
accepted  blank3's comment on that is mostly right too.  The
only thing is that you're not saying "all addresses should have
access" -- that's done in your firewall(s) and/or the server
software and/or other security layers like tcpwrappers., in this
context, means "all IP addresses