Computers

IPv6

There has been a lot of chatter on the CentOS list lately regarding the ups and downs of IPv6. It has not quite boiled down to a flame war yet, but now is a good time to start distilling down what everybody has had to say.

To start, what IS IPv6? Simply put, it is a newer implementation of IP addressing that allows for many more hosts, as we have been running out of IPv4 addresses and will come to the end shortly. In fact, it allows for more than 2^95 or 5x10^28 addresses per person alive on planet earth today. "Overkill!!!" you might exclaim. In the 70s, when IPv4 was designed, and there were less than 1000 hosts internetworked, you would have said the same thing about the mere 4 billion addresses allowed in that system. In an age where having your toaster internet accessible is not unheard of, you'd be surprised at how many you might use.

[music | Nick Cave and the Bad Seeds - All Tomorrows Parties]

This week both Ars Technica and Fark, both of whom get decent traffic, have basically begged users not to use ad blockers. I think people would be less likely to use ad block if your ads didn't kill our browsers, below are some examples.

Just to wrap up, and in case you are lazy like me, give you a whole file worth of subroutines. It's my toolbox and I'm giving it to you. I put this in a secure location and just call it from my other scripts. This makes the code much shorter in my other scripts, nearly auto-commenting, and avoids bugs because if it works in one, it will work in others.

NOTE: This uses the foundations in parts 1, 2 and 3. You can find them here: Part 1 Part 2 Part3

More foundational work. This stuff will configure for your site, and the routines that follow will regularly rely on them.

First, let's declare our modules:

#!/user/bin/perl
use strict;
use Net::LDAP;
use Authen::SASL;
use IO::Socket::SSL;
use Digest::SHA qw/sha1_base64/;
use Mail::Sendmail;
use Crypt::SmbHash;
use CGI;
use CGI qw/:standard/;