I'm going to spend a small program or Linux script to drop or eliminate the rules the local firewall. It's simple and practical not to be typing every line of iptables. Within the / scripts create a file called clear_iptables.sh with the following contents; #! / Bin / sh echo "Stopping the firewall and allowing all the traffic ..." / Sbin / iptables-P INPUT ACCEPT / sbin / iptables-P FORWARD ACCEPT / sbin / iptables-P OUTPUT ACCEPT / sbin / iptables-F / sbin / iptables-X / sbin / iptables-t nat-F / sbin / iptables - t nat-X / sbin / iptables-t mangle-F / sbin / iptables-t mangle-X / sbin / iptables-L-n now do executable and voila, we can give you to quickly flush the iptables rules in one command. root @ gateway: ~ # chmod + x / scripts / root @ clear_iptables.sh gateway: ~ #. / scripts / clear_iptables.sh Chain INPUT (policy ACCEPT) target prot opt ​​source destination Chain FORWARD (policy ACCEPT) target prot opt ​​source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination ... Read the full article »

What is a MAC address A MAC address is a unique number assigned to a network interface card (NIC), commonly called an ethernet card. This "address" is created by the manufacturer. A MAC address is a 12-digit number. Each digit is a number from 0-9 or a letter from A to F. Sometimes, the digits of a MAC address are separated by colons or dashes. Examples of possible MAC addresses are 001e68da5feb, 00:1 e: 68: da: 5f: eb, 00-1e-68-da-eb-5f. MAC address can also be confused with Internet Protocol address (IP) or email address. An IP address uses only numbers and points: 8.8.8.8 The MAC address can also be seen as an address of the modem. However, the description of the modem address is entitled "PPP" ... Read the full article »

That is a denial of service attack? An attack of distributed denial of service (distributed denial-of-service attack (DDoS attack)) refers to the cancellation or partial or total blockage of the services of a source / server / website on the internet. In general terms a method of attack involves saturating the victim's machine with thousands of service requests, which ultimately can not respond quickly to legitimate traffic so it is practically offline. This type of DDoS attacks consume computer resources and / or network to the point that they can not properly communicate with its users. The denial of service attacks are considered violations of the political use of IAB (Internet Architecture Board) not to mention violating the policies of any internet service provider (ISP) How to protect against attacks ... Read the full article »

We know how to test TCP connection to port with telnet. But if we stick to a UDP port, type: 10.10.10.1 vu nc-89 And that's it, to test UDP port using telnet, if not the netcat command, seen here before. ... Read the full article »

Sometimes it is necessary to know the maximum transfer rate of the network, or simply ensure that the LAN or WLAN in which we work does not use congestion Iperf tool console. As a reminder before we start talking about data transfer, 1 byte equals 8 bits. In the world of computers 1 kilo equals 1024 (2 ^ 10). For example, 100'000'000 bytes is not equal to 100 Mbytes, rather 100'000'000 / 1024 / 1024 = 95.37 Mbytes. How to use iperf server-side, and preferably as root lift iperf service listening on port 5001, keyboard; Server # iperf iperf-s ---------------- -------------------------------------------- Server listening on TCP port 5001 TCP window size: 85.3 KByte (default) ----------------------------------------- iperf client ------------------- Now the client side, keyboards;: ~ $ iperf-c ----------- guatewireless.org Client ------------------------------------------------- ... Read the full article »