OSI Model
Seven-layer dip A crabby user calls up to say that the intranet is taking forever to load, thus the network is slow. Let’s get to work using the OSI model to determine if the network truly is slow, or, more than likely, if the user is the slow one. Layer 1: The physical layer — […]
How to Reset Elastix PBX Web Admin Password
How to Reset Elastix PBX Web Admin Password?
What is a VPN?
A. VPN is an acronym for Virtual Private Network. A VPN provides an encrypted and secure connection “tunnel” from a user’s computer to its destination over the Internet.
Creating Cat5 Cables
Cat5 wiring
How to use wire shark to find a spamming computer?
Wireshark tracking down Spamming Email Computers on the Network.
DSL Speed Tests – Comcast
Having Problems with my Comcast Internet; here are some sample tests run with over a Motorola Surfboard Modem, and 10/100 Router. Have the Cable people out before these tests were run – will post results after their visit was over. I’m in the process of upgrading the Cable modem and Router hopefully this will solve […]
RAID 5, explained
RAID 5, explained RAID 5 (block-level striping with distributed parity) distributes parity along with the data and requires all drives but one to be present to operate; drive failure requires replacement, but the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such […]
How to be an ISP:
Build your own hot spot By Dong Ngo If you go to the CBS Interactive building at 235 Second Street in San Francisco and turn on your laptop, you will find an access point called “CBS_Interactive_Public” that offers free wireless Internet access. That’s a typical example of a hot spot. However, it doesn’t take a […]
Configuring a Windows/SMB Shared Printer – SUSE Linux
Sharing a printer from a Windows computer is a cost-effective way of making the printer available to everyone on a network. As such, it’s often done in a home environment, where a printer can be shared among computers used by family members, or in an office environment, where a printer might be connected to a […]
Linux / UNIX Find Out What Your Dns Server Addresses is
The resolver is a set of routines in the C library that provide access to the Internet Domain Name System (DNS). The resolver configuration file contains information that is read by the resolver routines the first time they are invoked by a process. To see your DNS server address type following command as shell prompt: […]
Public DNS Servers
The purpose of a DNS server is to enable people and applications to lookup records in DNS tables. A few domain name servers on the Internet provide DNS resolutions for anyone who requests it of them. These are known as “Public DNS Servers.” Listed below are several Public DNS Servers Level 3 Communications (Broomfield, CO, […]
What Makes up a Subnet Mask (SNM)?
In Binary: 1’s represent what portion of the IP address is the Network ID 0’s represent what portion of the IP address is the Host ID For Example: 207.23.106.99      (Class C Address) Net . Net . Net . Host 11111111 . 11111111 . 11111111 . 00000000 (SNM in Binary) 255.255.255.0 […]
Address Classes: Network IDs and Host IDs
Class A (1st Octet 1-127)   -     Network.Host.Host.Host Class B (1st Octet 128-191) -  Network.Network.Host.Host Class C (1st Octet 192-223) - Network.Network.Network.Host  If the 1st Octet is: 1 – 127  Class A  Net.Host.Host.Host 128-192 Class B  Net.Net.Host.Host 192-224 Class C  Net.Net.Net.Host 224-240 Class D […]
IP Addressing and Subnetting
Learn to Subnet™.com A Free Lecture-based Educational Course on IP Addressing and Subnetting Part of the www.LearnTCPIP™.com Education Series Covering TCP/IP, TCP, DNS, Ethernet, OSI Model, Subnetting, IP Addressing and the Internet Learn to Subbet