Linux, Windows, Security, Programming, Network Tutorials
NTP is a core protocol used today’s IT infrastructure to synchronize date and time information. In order to work properly, we need to configuration NTP port in our server, client and intermediate systems like switch, firewall, router. NTP Port UDP 123 NTP uses the UDP port number 123 by default. NTP services run on UDP protocol … Read more
Nettime is a simple time synchronization client for Windows 95/98/200/Vista/7/10 and Windows Server 2003/2008/2012/2016 . It is very lightweight and uses very tiny system resource. Features Here is some of main features and attributes of the Nettime application. `Free` where we do not need to pay any price to install and use `Open Source` where … Read more
Nmap tool provides a popular ports list as a database where this list is also used in network and service scans. Here is the list but before we will look at the command which will list ports according to the popularity. Nmap Top Ports Listing We can use sort command in order to list ports according … Read more
Checkpoint, Palo Alto, Cisco ACS, and others, all of them are enterprise, popular and good firewalls. But all of them require some price to pay. Is there any free alternative to these enterprise firewalls? Yes, there are a lot but most of them are not a competitor for them. Pfsense is the most advanced, powerful, … Read more
Time is important for systems because all work done according to time and logs get their timestamps. Normally server hardware provides time but it can be false over time because the hardware clock is not precise. Ntp is a protocol designed to get time info from the network. NTP can also provide date and time … Read more