MAMPIER SEJENAK

Network

2010-10-01T22:08:00.001-07:00

The concept of network classes is a little obsolete as subnets are now used to define smaller networks. These subnets may be part of a class A, B, C, etc network. For historical reference the network classes are defined as follows:

* Class A: Defined by the first 8 bits with a range of 0 - 127.
First number (8 bits) is defined by Internic i.e. 77.XXX.XXX.XXX
One class A network can define 16,777,214 hosts.
Range: 0.0.0.0 - 127.255.255.255
* Class B: Defined by the first 8 bits with a range from 128 - 191
First two numbers (16 bits) are defined by Internic i.e. 182.56.XXX.XXX
One class B network can define 65,534 hosts.
Range: 128.0.0.0 - 191.255.255.255
* Class C: Defined by the first 8 bits with a range from 192 - 223
First three numbers (24 bits) are defined by Internic i.e. 220.56.222.XXX
One class B network can define 254 hosts.
Range: 192.0.0.0 - 223.255.255.255
* Class D: Defined by the first 8 bits with a range from 224 - 239
This is reserved for multicast networks (RFC988)
Range: 224.0.0.0 - 239.255.255.255
* Class E: Defined by the first 8 bits with a range from 240 - 255
This is reserved for experimental use.
Range: 240.0.0.0 - 247.255.255.255

Network security concepts

2010-10-01T21:41:00.001-07:00

Network security starts from authenticating the user, commonly with a username and a password. Since this requires just one thing besides the user name, i.e. the password which is something you 'know', this is sometimes termed one factor authentication. With two factor authentication something you 'have' is also used (e.g. a security token or 'dongle', an ATM card, or your mobile phone), or with three factor authentication something you 'are' is also used (e.g. a fingerprint or retinal scan).

Once authenticated, a firewall enforces access policies such as what services are allowed to be accessed by the network users.[2] Though effective to prevent unauthorized access, this component may fail to check potentially harmful content such as computer worms or Trojans being transmitted over the network. Anti-virus software or an intrusion prevention system (IPS)[3] help detect and inhibit the action of such malware. An anomaly-based intrusion detection system may also monitor the network and traffic for unexpected (i.e. suspicious) content or behavior and other anomalies to protect resources, e.g. from denial of service attacks or an employee accessing files at strange times. Individual events occurring on the network may be logged for audit purposes and for later high level analysis.

Communication between two hosts using a network could be encrypted to maintain privacy.

Honeypots, essentially decoy network-accessible resources, could be deployed in a network as surveillance and early-warning tools as the honeypot will not normally be accessed. Techniques used by the attackers that attempt to compromise these decoy resources are studied during and after an attack to keep an eye on new exploitation techniques. Such analysis could be used to further tighten security of the actual network being protected by the honeypo

Setting DNS Server

2008-07-10T05:30:00.000-07:00

Panduan setting DNS tersebut dibuat dengan tujuan untuk mendukung proses instalasi zimbra mile server dimana pada saat proses instalasi, zimra akan melakukan proses lookup terhadap DNS

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Mikrotik OS BM

2008-07-10T05:20:00.000-07:00

MikroTik RouterOS™ adalah sistem operasi dan yang dapat digunakan untuk menjadikan komputer manjadi router network yang handal, mencakup berbagai fitur lengkap untuk network dan wireless, salah satunya adalah bandwidth manajemen. Saya coba mengulas cara2 paling awal untuk setting mikrotik untuk BW manajemen.
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