router

How to determine serial numbers for cisco router and Catalyst switch

January 25, 2011

For Cisco Routers If you want to know the chassis serial number for your router use the following command Router> sh inventory Output NAME: “2821 chassis”, DESCR: “2821 chassis”PID: CISCO2821  , VID: V04 , SN: FCZ10231VG NAME: “WAN Interface Card – Serial 2T”, DESCR: “WAN Interface Card – Serial 2T”PID: WIC-2T   , VID: V01, SN: [...]

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Address Resolution Protocol

January 24, 2011

ARP and RARP Address Translation Address Resolution Protocol (ARP) provides a completely different function to the network than Reverse Address Resolution Protocol (RARP). ARP is used to resolve the ethernet address of a NIC from an IP address in order to construct an ethernet packet around an IP data packet. This must happen in order [...]

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Access list types

January 21, 2011

There are three basic types of IP access lists: standard, extended, and dynamic extended. Standard access lists use source addressing for applying rules and provide very basic forms of filtering. Extended access lists use both source and destination addresses for filtering and even allow filtering by protocol type. This allows a more granular method of [...]

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10 things About Cisco Access list

January 21, 2011

What is an access control list? In the Cisco IOS, an access control list is a record that identifies and manages traffic. After identifying that traffic, an administrator can specify various events that can happen to that traffic. What’s the most common type of ACL? IP ACLs are the most popular type of access lists [...]

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How To Configure Router-on-a-stick

January 21, 2011

Connect a Cisco switch and router via 802.1q trunking. This configuration is known as a router-on-a-stick. First, let’s start with the switch. VLAN 1 exists by default, so we’ll add a couple of other VLANs: vlan 100 name data state active vlan 200 name data state active Now, let’s configure the switchport to connect to [...]

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Communication Devices in Computer Network

January 21, 2011

An electronic device that can send and receive data on the network is called the communication device. The communication devices are used on both ends of the connections. Most of the communication devices have the ability to convert the digital signal of computer into analog signal so that the signals can be transmitted on the [...]

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NAT and PAT Configuration on Cisco Router

January 18, 2011

There are two types of NAT that can be configured on a Cisco router; static, and dynamic. Static NAT Configuration: This type is used when you want to do one-to-one assignment of local IP addresses to global IP addresses. 1. Establish static translation between an inside local address and an inside global address, Router(config)#ip nat [...]

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Inter-VLAN Routing Configuration on Cisco Router

January 18, 2011

Requirements: You have to make sure that your router support the frame tagging technology used between the switches. Before jumping into the router configuration, you have to configure a port in the switch that will be connected to the router to be a trunk port. And keep remembering the VLAN tagging method that you configured [...]

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BRI ISDN Configuration On Cisco Router

January 18, 2011

There are two ways to configure ISDN in a Cisco router. The first one is to setup the ISDN connection to be always on. This method will be very costly because most ISDN service providers charge not only by monthly subscription, but by the amount of data that you transfer. Having the connection opened 24/7, [...]

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ISDN Dialer Profiles Configuration On Cisco Router

January 18, 2011

If you are implementing ISDN between two nodes only, you probably do not need to use this procedure. What the dialer profiles do is that it maps a dial string along with username to a certain destination. This way, the router knows what number to dial for different ISDN destinations using the same link. The [...]

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How to understand IOS file name Convention

January 18, 2011

The IOS file name is usually similar to this form: xxxx-yyy-ww.aaa-bb.bin 1. The xxxx is the platform. For example: c1005 – For 1005 platform c1600 – For 1600 platform c1700 – For 1700, 1720, and 1750 platforms c2500 – For 25xx, 3xxx, 5100, and AO (11.2 and later only) platforms c2600 – For 2600 platform [...]

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10 importent show commands

January 18, 2011

The ‘show’ commands are the most widely used in Cisco routers. Here is a list of the 10 mostly used of these ‘show’ commands. 1. show running-config This command is your true best friend. It shows the complete configuration that is running currently. Using it you can troubleshoot almost all issues regarding routing, filtering, secure [...]

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How to Configure Site-to-Site VPN in Routers (CISCO)

January 18, 2011

When would you need this: When you want to create a secure tunnel to transfer data between two sites without the use of VPN concentrator or other security devices. Special Requirements: The routers used must support IPSec. Most of Cisco routers do. Another need is that both sides use a static public IP address to [...]

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How to configure EIGRP on your Cisco router

January 18, 2011

Nots: EIGRP is a Cisco proprietary protocol. So, either all the routers in the Internetwork must be Cisco routers, or the routers should be EIGRP capable. Before starting, if you have not set the bandwidth of the interfaces, set them now. For correct routing decisions, you need to set the bandwidth for the serial interfaces [...]

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Little about ISO/OSI layers

January 18, 2011

If you want to remember the sequence of the OSI layers model name then the following two sentences can help you a lot for this purpose.“All People Seems To Need Data Processing”. Open Systems Interconnection (OSI) model is developed by ISO (International organization for standardization) in 1984. OSI reference model is a logical framework for [...]

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