Information Technology Blog (Archive)

The purpose of this lab is to present the two of the four OSPF network types that you can use with Frame Relay: Point-to-point and Multipoint and some issues you may encounter because mainly, OSPF works differently on each type. Wendell Odom in his book, CCNP Route Official Certification Guide outlined the three important points when using OSPF over Frame Relay which is basically the inspiration of this lab.  To get started, paste the base configuration below for each router: R1 hostname R1 ! interface Loopback0  ip address 10.2.1.1 255.255.255.0 ! interface Serial0/0  no ip address  encapsulation frame-relay  no shutdown ! interface Serial0/0.2 point-to-point  ip address 10.2.12.1 255.255.255.0 ! interface Serial0/0.3 point-to-point  ip address 10.2.13.1 255.255.255.0 ! interface Serial0/0.45 multipoint  ip address 10.2.145.1 255.255.255.0 ! router ospf 1  log-adjacency-changes  network 10.2.0.0 0.0.255.255 area 0 R2 hostname R2 ! inter...

IPv6 is one of those CCNA topics I was not confident explaining to someone. I was intimidated by its new features and whenever I see those series of 32 hexadecimal numbers, I get really uneasy. So I decided to put an end to it by getting in the bottom of things with IPv6. Now I am no longer intimidated and I am glad to finally get this off of my chest. ;) So here, I want to share my study notes on IPv6. Some facts about IPv6 - 128 bit address; 32 hexadecimal numbers; 8 quartets of 4 hex digits - IPsec is required on IPv6 hosts - improvement of IPv6 header: no more recalculation of checksum for every packet sent & includes flow label for easy identifaction of packets sent over the same TCP/UDP connection - strategic IPv6 address assignment has been adapted from IPv4 and this process is being handled by Internet Corporation for Assigned Network Numbers (ICANN) - no more broadcast (uses multicast, unicast and anycast) Subnetting A company was assigned by ISP with address 2340:1111:AAA...

Using virtualization, we can try executing a basic Asterisk dialplan and make a SIP call between two Windows machines. Requirements 1. Fully setup Asterisk call manager on your Linux Machine with configuration all set to default 2. Softphone applications (3CX) on Windows 7 host and Windows XP guest 3. Enabled Microsoft Loopback Adapter on Windows 7 host 4. Knowledge on basic networking (LAN connectivity) Setup LAN Connectivity All three machines must be on the same subnet. This is the IP configuration I used in this scenario: Windows 7 host [Microsft Loopback Adapter] IP Address: 172.30.100.13 Subnet mask: 255.255.255.0 Windows XP guest IP address: 172.30.100.14 Subnet mask: 255.255.255.0 Ubuntu guest IP address: 172.30.100.20 Subnet mask: 255.255.255.0 Now we need to test our virtualized LAN connectivity. All machines must be able to ping each other. This is possible using the Microsoft Loopack Adapter on our host machine. Setup Asterisk This is the default script for our asterisk.con...