Achmad Mardiansyah – Page 3

Jun212017 by Achmad MardiansyahNo Comments

What is cyber attack: DOS, DDOS, bruteforce

security

The word "attack" is not only belong to martial arts or military. In IT world we also use this term "attack" to describe an action that is done by a system to damage or destroy the target system / network. In this article we will discuss what is cyber attack: DOS, DDOS, bruteforce. these attack usually related to each others. (more…)

Jun212017 by Achmad MardiansyahNo Comments

What is managed switch?

layer 2, Routerboard, RouterOS, switch, SWOS

Previously we already know that there a network devices called switch. which could improve a network performance especially in ethernet technology. You already know that network segmentation can be done based on port using VLAN technology with the use of router for inter-vlan routing. Normally, to configure VLAN on a switch is by connect to it physically. However, this practices is annoying because we have to come on site for configuration. switch vendors then make switches that can be controlled from remote place and later on its called managed switch. (more…)

Jun202017 by Achmad Mardiansyah8 Comments

Mikrotik roles on VLAN

layer 2, Routerboard, VLAN

So we already know what the VLAN is from this article, and also aware VLAN is just a layer-2 technology that enables flexibility of partitioning your network. With VLAN, you can partition your switch logically using a web or command-line interface. The next question arises, so what Mikrotik Routerboard does to support VLAN? Mikrotik roles on VLAN? (more…)

Jun192017 by Achmad MardiansyahNo Comments

June 2017, GLC Webinar: Configuring Mikrotik Hotspot

webinar

Configuring Mikrotik Hotspot. In this webinar, we discuss a feature from mikrotik routerOS that is called hotspot. This feature enables administrator to provide web-based authentication for clients. Hotspot login page can be modified to customer need. walled-garden allows clients to access website without authentication, and radius feature enable hotspot to query external radius server for account. (more…)

Jun192017 by Achmad MardiansyahNo Comments

Routerboard selection guide: switch

layer 2, Layer 3, Router, Routerboard, switch, SWOS

So, many years ago (before 2014), Mikrotik just produced switches for small network. Therefore, when we build a network that requires high-port density (requires many ethernet ports), we use products from other vendors. Mikrotik at that time was used as a routing device. This article will talk about Routerboard selection guide: switch But now in 2017, mikrotik product portfolio has improved, and you already see some switches products on the list. Why ethernet switch? Not token ring or other? Because Ethernet is the technology that people use most. Its cheaper, easy to get and install, and still evolving to support higher and higher data rate. That is why Mikrotik produces ethernet switches. (more…)

Jun182017 by Achmad MardiansyahNo Comments

What is VLAN?

layer 2, VLAN

Ok before we talk about "what is VLAN", we already know the cool layer 2 devices, which really help us reducing collision domain. Network performance is improved and users are happy :-). most of the picture in this articles are taken from this GLC webinar. [caption id="attachment_566" align="alignnone" width="300"] Physical LAN[/caption] Up to this point (using a dumb switches), we are segmenting network based on the physical switches aka. Physical LAN - PLAN. The more segments you need, the more switches you buy, the router is used to forward traffic between LAN. Just like the picture above. (more…)

Jun172017 by Achmad MardiansyahNo Comments

Routerboard selection guide: ethernet router

Routerboard

All right, so from the previous article, we already know that Mikrotik is producing networking hardware named Routerboard. now its time to discuss Routerboard selection guide ethernet router. Why ethernet router? Not token ring or other? Because Ethernet is the technology that people use most. Its cheaper, easy to get and install, and still evolving to support higher and higher data rate. That is why Mikrotik produces ethernet routers. (more…)

Jun162017 by Achmad Mardiansyah1 Comment

Differences between RouterOS, SwitchOS and Routerboard

layer 1, layer 2, Routerboard

As a new mikrotik user, sometimes people get confused with Mikrotik products. Even though all mikrotik products can be found in http://routerboard.com, with lots of variations of products, people are wondering what are the differences between RouterOS, SwitchOS and Routerboard, and this article will discuss about that with historical background. What is RouterOS (ROS)? This was the first product from mikrotik. Mikrotik was established in 1996 as a company that was focused on networking. One of their task was managing networks which require them to setup hardware and software to make network running well. At that time, for cost saving, they use PC as router and build their own linux distribution that is specialised for networking. So people just download the ISO, burn it to a CD-ROM, and then install…

Jun152017 by Achmad MardiansyahNo Comments

What is multiplex, multiple access?

multiplexing, telecommunication

For those who learns telecommunications or networking (computer) there is an important technology/concept that you need to know that is multiplexing. in this article, we will talk about what is multiplex, multiple access?. it would be better if you already familiar with the telecommunication terms. So what is multiplexing or demultiplexing? Multiplexing means a process to combine multiple signal stream (can be digital or analog signal) into one physical medium. At the end of communication link, there will be a demultiplexing process that split the combined signals into individual stream. These devices the job are called multiplexer (MUX) and demultiplexer (DEMUX / DMX). see picture below: (more…)

Jun142017 by Achmad MardiansyahNo Comments

Central office, switch, trunks, local loop

layer 1, layer 2, telecommunication

In the early of telephone communication, a central office (aka. telephone exchange, switch) provides a coverage area where all telephones should connect to it. these physical connections from customer premise to central office is called access network / local loop / subscriber line. (Central office, switch, trunks, local loop) Why is it called switch? Because it switches (connects) connection between subscribers. With switching capability, 2 subscribers can communicate because their physical lines are connected by the switch. in the beginning, this switching process was done by human. later on, its automated by mechanical switches and then fully digital. max distance of cable? when the signal travels over cable, it gets attenuated. therefore, there is a maximum limit of local loop distance (around 3-4 km), which defines a coverage area of…