How to install and configure the anonymous Tor network
Tor (The Onion Router) Tor is a set of open networks based on free software which prevents us to be watched on the network, and helps us to protect our information and personal freedom. It is a defense to our privacy, and maintains confidential and secret activities of the business. The idea of the network onion (onion networks) is to protect user privacy by making it almost impossible for anyone to know where you are connecting and your habits ... Read the full article »
Filed under: Security
Security violation at kernel.org
Earlier this month, a number of servers in the infrastructure of kernel.org compromised. We discovered this on August 28. Although now believe that the source code repositories were not affected, we are in the process of verifying this and take steps to improve the security of the entire infrastructure of kernel.org. What happened? Intruders gained access to the server root of Hera. We may have won ... Read the full article »
Filed under: Security
Command to generate random passwords in Linux
Today, cyber attacks also called hacks or cracks are on the agenda. To protect against dictionary attacks or brute force passwords need to devise difficult and many characters. As I can generate secure random passwords using the Linux command line? So easy, you only need to install the programs with which we get passwords generated via random function Linux Debian / Ubuntu: ~ $ sudo apt-get install pwgen Centos / Redhat: ~ # ... Read the full article »
Filed under: Security
How secure is my password?
Have you ever thought about how safe or difficult to break can be our password? Whether the login to our Windows, Linux or our mail hotmail or gmail. Here are two sites share in the first able to enter a password to check on how long a conventional PC-based dictionary attacks or brute force can break the secret of our password. How safe is my password The second site, using different and perhaps more professional to measure the strength of your password. Through several tests on our password, it conduct a little test to measure the number of characters, uppercase and lowercase combinations of letters and digits, as well as special characters that make up the whole of your key to ... Read the full article »
Filed under: Security
Cracking a WEP Crack wirelessly using AIR
Finally, I share the simple steps to crack a wireless WEP key using the free software called air crack. The method of decryption is done by listening or doing the sniffing of the network, then capture the encrypted packets, then run the software that decrypts the data discovered or captured. What is WEP? WEP (Wired Equivalent Privacy) is fairly easy to decipher because it uses a single key to encrypt all traffic. Basically, the communication between two nodes in a wireless network is based on the MAC address. In the model, each host will receive only packets destined for the MAC address of its interface. This communication is kept private thanks to the WEP encryption key. However, if a client establishes network card mode ... Read the full article »
VPN Ports
Cisco VPN Ports The port numbers for various services required to configure a Primary Network Virtual depend on the software and protocols used PPTP encapsulates the packets using GRE (Generic Routing Protocol), which uses IP port 47. IANA list port 1723 as defined for use in VPNs, so both must be open. L2TP protocol assigns the number 115 as its port. Allocations for IPSec-based VPNs using Encapsulation Security Protocol (50) and Authentication Header (protocol 51). The port 88 for Kerberos authentication in TCP / UDP port 500 for Internet Security Association and Key Management Procotol TCP / UDP. VPNs over SSL to secure HTTP connections use port 443. MPLS-IP uses port 137 ports for systems using hardware ... Read the full article »
Linux Commands anti-DDOS
Two commands quick and easy to run to stop denial of service attacks from zombie machines. The first command we used for our server to discard all packets of a certain length. iptables-A INPUT-p tcp-d IP-m-length length 40:48-j DROP The following command will automatically block all incoming packets with a TTL value (another common form of DDOS attack) iptables-A INPUT-p tcp -s 0.0.0.0 / 0-d IP-m ttl-ttl 111-j DROP ... Read the full article »
Port List ILOM (Integrated Lights Out Manager)
Installation requirements Remote Console SUN ILOM does not require installation of hardware or software. However to run the Sun ILOM Remote Console, you must have installed JRE 1.5 or higher (Java 5.0 or higher) on the local client. To download the runtime environment (JRE) Java 1.5 see java.com. Additionally ILOM browsers supported by Sun ILOM remote console is supported by the local client operating systems and browsers listed below: Solaris (9 and 10) Mozilla Firefox 1.7.5 and higher and higher Linux 1.0 (Red Hat, SuSE, Ubuntu ) Mozilla Firefox 1.7.5 and higher 1.0 and higher Opera 6.x and higher Microsoft Windows (98, 2000, XP, Vista) Internet Explorer 6.0 and higher Mozilla Firefox 1.7.5 and higher 1.0 and higher Opera 6.x and higher Below A table containing the list of ports that are ... Read the full article »
Filed under: Security , Sun Microsystems
Block or deny access to root via OpenSSH
SSH (secure shell) is a protocol for creating a secure connection between two computers. This connection provides us with user authentication, compression and encryption of the data channel, making it a very safe way for users to connect remotely to a Linux server. Because dictionary attacks or brute force constant on this protocol, you should deny or restrict root access to our server via OpenSSH. As blocking root access with session ssh? To lock the remote users login in this case root, we must edit the configuration file / etc / ssh / sshd_config. Where we add the option DenyUsers. This option is followed by a list of users separated by spaces. The login is disabled for users that match these patterns. They are only valid names ... Read full article »
Filed under: Systems Management , Security
DNS Servers and Ports Firewalls
Today I asked what was to have an open port firewall to accept queries to a DNS server. For anyone who has doubt, the services of a Domain Name Server use port 53 on UDP and TCP also for zone transfers (axfrs). So you need to open these ports if we are providing a service resolution domains. Incoming ports or destination ports TCP/53 Outgoing TCP/1024-65535 UDP/53 UDP/1024-65535 In other words, you must open or accept connections on ports where our services heard. Likewise, our machine will use a range of ports where trying to connect to your destination port. ... Read the full article »
Filed under: Networking and Communications , Security
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