Linux Tips, Troubleshooting, Package, Installation Tools

VoIP has improved a lot since its first days, today a lot of multinational business are using it as a reliable way to keep stay in touch. With more and more telecommuters, and business man working, and with cell phone roaming costs still high, VoIP is a real option for both big and small corporations. And when you talk to a CFO about investing to save costs, you usually will see the checkered flag for your project. Most of these projects will involve IP phones or ATAs, but you may use softphones too, which are very convenient for the traveler guy, here we will review some of the soft phones available for Linux. Linphone Linphone is a mature piece of software, it uses SIP, for voice and video over IP, it can work as a stand alone application, and you can call other sip enabled devices just entering its ips on the dial window of Linphone, or you can configure it to use an Asterisk PBX. There are binary packages for the most common distros, so try to install it using you pa...

Access Lists There are a number of different access lists: http_access : Allows HTTP clients (browsers) to access the HTTP port. This is the primary access control list. http_reply_access : Allows HTTP clients (browsers) to receive the reply to their request. This further restricts permissions given by http_access , and is primarily intended to be used together with rep_mime_type acl for blocking different content types. icp_access : Allows neighbor caches to query your cache with ICP. miss_access : Allows certain clients to forward cache misses through your cache. This further restricts permissions given by http_access , and is primarily intended to be used for enforcing sibling relations by denying siblings from forwarding cache misses through your cache. cache : Defines responses that should not be cached. url_rewrite_access : Controls which requests are sent through the redirector pool. ident_lookup_access : Controls which requests need an Ident lookup. always_dire...

Until some weeks ago I used to use only apt-get, and then I realized that aptitude is better in taking care of orphan packages. I am no expert here, but this is the way I think they both work, at least on Debian Etch, I have heard that in Lenny both works more or less the same, I use Lenny, and yes they can do the same thing but in different ways. Well when you install a package with apt-get, and that packages needs other packages due to dependencies, it will install all of them for you, which is great, but then when you want to remove the installed package, apt-get will let the automatically installed packages in your PC, while aptitude will rid them away. Aptitude marks all installed packages as "manual installed" and "automatically installed", the first are those you explicitly ask it to install and the latter are those which it decided to install by you, because they are needed, so when you ask aptitude to remove a package it will remove also the automatical...