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Hello beast5, I have used the approach on CentOS 6.5, Ubuntu 14.04 and 12.04 LTS without any problem. May also work on Debian. No I have not yet tested it on a big server with a lot of traffic, although my guess is that it can scale well. Someone had done some experiments on this. Please see...

As a dedicated server or Virtual Private Server (VPS) owner, one of the important tasks is to defend against online attacks. In this tutorial I will discuss how to use IPset with dynamic blocklists to better secure your server. IP sets are a framework inside the Linux kernel, administered by the...

Congratulations to all of the winners! And a sincere thank you to the members who voted for me. I am glad that those tutorials were helpful.

You need cloudflare, and a third server with the program "monit" to monitor the two servers. See details here: http://blog.booru.org/?p=12

I have just updated my tutorial on how to install Ghost blog 0.4.2 on Ubuntu 14.04 (Trusty) or 12.04 (Precise), with Nginx as a reverse proxy and the ModSecurity web application firewall. The following extra topics are also covered (via links to original posts where appropriate): Example...

Now I understand your question better... In that case you can create one Asterisk extension for each of your frequent contacts, no phone number is required and all calls between these will be free. That's what I do for my family. For example, create extension 101 for yourself and 102 for your...

I'd say use PBX in a Flash (Asterisk+FreePBX+Extras), follow guide in my signature to install on your VPS. For getting a DID phone number you can use Anveo (or Anveo Direct, may be cheaper). They support SMS. And for Android VoIP client try Zoiper. It works great for me and they recently added...

So many experts on servers and networking in this forum. Very impressed indeed.

I maintain a personal PBX server for my family to make free or very cheap VoIP calls - see tutorial in my signature. (You may have seen my response at LET... Reposting it here.)

Related new announcement - http://seclists.org/bugtraq/2014/Apr/34 Quoted from link: "In case of doubt a full system restart is recommended."

Relevant changelog for Ubuntu openssl package: https://launchpad.net/ubuntu/+source/openssl/+changelog Run "apt-get update; apt-get upgrade" to see other software that have been updated in the Ubuntu repos. Before doing that, make sure you have "deb http://security.ubuntu.com/ubuntu ... " in...

Have a look at my SSHFS tutorial for CentOS and Ubuntu (using FUSE). It is quick and easy. https://blog.ls20.com/using-sshfs-to-share-folders-between-your-servers/

CORRECTION: It seems that xtables-addons (version 1.47.1) does not compile on the latest CentOS 6.5 kernel. There is a workaround as stated in this comment. Basically, that commenter says you need to do the following: Edit file /lib/modules/your_kernel_version/build/include/linux/autoconf.h...

Yes I have seen the exact thing on my servers. Let me show you what I did to stop this. I noticed that this particular scanner always start with "EHLO 192.168.2.33". So I implemented these: iptables -t raw -A PREROUTING -i eth+ -p tcp --dport 25 -m string --string "192.168.2.33" --algo bm -m...

If you only run Linux at home, you can use that idle Windows VPS to remotely run some windows-only software, such as minesweeper and 3d pinball space cadet.

Thank you for pointing that out. It is indeed less secure to run SSH on a port >= 1024. I've just found this answer on serverfault that confirms your point. With that said, if we choose a port < 1024, combined with the IPTables "psd" module, we can still make the port scanning difficult.

CORRECTION: For Ubuntu, you can use the commands below to install packages required for compiling "xtables-addons":     apt-get update     apt-get install libtext-csv-xs-perl linux-headers-`uname -r` \             iptables-dev xz-utils build-essential automake unzip zip  

A quick tutorial on how to enable extra IPTables functionality such as geoip, port scan detection, port knocking and "tarpit" using the "xtables-addons" package. Full list of available modules can be found here. Note 1: Does NOT work on OpenVZ VPS (unless the host node provides the modules).  ...

Just want to make a correction to my previous post regarding IPsec/L2TP VPN behind NAT and Windows users. Someone reminded me yesterday that different registry changes are needed for XP users, and for those running later versions. For XP users, see: http://support.microsoft.com/kb/885407     ...