OSI Model the easy way

7. Application – Browser, FTP client, Telnet client
6. Presentation – encryption, compression, SSL
5. Session – authentication, permissions, sockets,
4. Transport – Protocol (TCP/UDP), ports
3. Network – IP Address, Routing
2. Data Link – MAC Address
1. Physical – Cable, Ethernet Card

Cisco router on a stick


* packet tracer is used in this setup

ROUTER CONFIGURATION

A. Create sub-interfaces

# configure terminal

# interface FastEthernet 0/0.10

# encapsulation dot1q  10

# ip address 192.168.10.1 255.255.255.0

# interface FastEthernet 0/0.20

# encapsulation dot1q  20

# ip address 192.168.20.1 255.255.255.0

# interface FastEthernet 0/0.30

# encapsulation dot1q  30

# ip address 192.168.30.1 255.255.255.0

! Check time

CREATE DHCP SERVER FOR THE SUBNETS

# configure terminal

# ip dhcp excluded-address 192.168.10.1 192.168.10.5

# ip dhcp excluded-address 192.168.20.1 192.168.20.5

# ip dhcp excluded-address 192.168.30.1 192.168.30.5

# ip dhcp pool accounting

# network 192.168.10.0 255.255.255.0

# default-router 192.168.10.1

# ip dhcp pool procurement

# network 192.168.20.0 255.255.255.0

# default-router 192.168.20.1

# ip dhcp pool services

# network 192.168.30.0 255.255.255.0

# default-router 192.168.30.1

! Check time

SWITCH CONFIGURATION

A. Create VLANs

# configure terminal

# vlan 10

# name ACCOUNTING_DEPT

# vlan 20

# name PROCUREMENT_DEPT

# vlan 30

# name SERVICES_DEPT

B. Configure Interfaces

# configure terminal

# interface fastEthernet 0/1

# switchport mode access

# switchport access vlan 10

# interface  fastEthernet 0/2

# switchport mode access

# switchport access vlan 20

# interface  fastEthernet 0/3

# switchport mode access

# switchport access vlan 30

! Check time

Set PC configuration to DHCP (obtain IP address from DHCP server)

Some issues about Cisco Linksys Routers

According to Jason Perlow, some routers of Cisco have certain issues. The models mentioned were WRT-610N, E3000, E2000, and E1000. According to the article, those models were experiencing reliability issues and sometimes knocks out your Internet access. The devices get so hot to a point were you would think it’s overheating.

Good news is that Cisco Engineers are actively looking to fix the issues and make the users “happy” and  “confident” about Cisco Linksys producs. You can read his entire article at http://www.zdnet.com/blog/perlow/cisco-linksys-the-makeover/16665

BSD Magazine October 2010 Issue

Check out my article in this issue, entitled  I.T. Certifications and The Value I Got In It

 

  • Commissioning FreeBSD with the Drupal Content Management Framework – Part 1

    With nearly 6000 modules and PHP support Drupal offers a sophisticated web development platform as well as a thriving community. Drupal, originally conceived by Dries Buytaert, has a reputation of being an extremely capable DContent Management System (CMS) albeit with a steep learning curve. While many criticisms concerning the complexity of the interface will be addressed in the forthcoming Drupal 7 release (which is currently in the alpha stage), Drupal 6 excels in stability, flexibility and high quality code. The developers also subscribe to a transparent policy towards security issues, and have a dedicated security team which ensures that core modules remain high quality. Used as the basis of many high profile sites.


    – ROB SOMMERVILLE
  • Building VPNs on OpenBSD

    A VPN is a network made up of multiple private networks situated at different locations, linked together using secure tunnels over a public (insecure) network, typically the Internet. VPNs are becoming increasingly popular, as they allow companies to join the LANs of their branches or subsidiaries into a single private network (site-to-site VPNs) or to provide mobile employees, such as sales people, access to their corporate network from outside the premises (remote-access VPNs), thus making accessing and sharing internal information much easier.


    – Daniele Mazzocchio
  • Closed-source and unsupported drivers with FreeBSD

    Sooner or later you come to a conclusion that you need to have an enhanced mobility throughout your home place. And you decide to purchase an Wi-Fi card and put it into a home gate-keeper. Do you know about troubles that could bring this simple transaction like WiFi network card purchase?Some might ask – is it necessary to buy a WiFi-card instead of a simple AccessPoint (AP)? At first glance you can figure out that there exist the fine models of ADSL-modems with wireless capabilities and that could work as AP. However, it should be noticed that: a) not all home connections to an Internet-provider go through a „copper” like phone- or cable-line; b) you simply need to add a WiFi-capability to an already working gate; c) a WiFi-card itself costs several times cheaper of AP.


    – Anton Borisov
  • I.T. certifications and the value I got in it

    Joshua shares his experience with our readers, this time about certifications.


    – Joshua Ebarvia

 

Click here to download  your FREE copy…