Introduction to TCP/IP Layers

TCP/IP Layers Introduction Computer communication follows some well defined rules and guidelines which we call protocols. In order for the computers to exchange data they have to agree on using the same rules, otherwise they become incompatible. That was the case in the past. This was one of the reasons to create a common model for communication....

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Firewall Security-Level

Firewall Security-Level This is my first Security Post regarding Cisco PIX/ASA firewalls. To begin with, what is a firewall? Literally, in the real world, a firewall as part of a building, is used to you guessed it: protect the building from fire. :) The same applies in the networking world. A firewall is a device that prevents unauthorized...

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Router as a DNS server

Cisco Router as a DNS server Not exactly like a DNS server that is hosted from a server and so on and so forth, the Cisco Router can act like a DNS server without the service stated above. It can even act as a proxy dns server, meaning forwarding the request to the upstream DNS server and cache the replies from the DNS server, so it can use the...

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VRF Route Target

VRF Route Target MPLS VPN implementation requires VRF and also exporting and importing routes for that VRF. I mentioned on my previous posts about VRF that the VRF name is locally significant and even the RD number. What counts is what you import and export. Importing and exporting route targets use the same syntax as the RD and it is ASN:NN...

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IPSEC VPN Configuration

 IPSEC VPN Configuration IPSEC VPN's have revolutionized the networking world. It is usually used over the unsecured network called "the Internet". It's a way to ensure secure transfer of data over the internet and used for site to site connections and telecommuters who need remote access from anywhere to the corporate Intranet or for remote...

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HSRP Configuration (new..!)

Packet Tracer 6.0 - HSRP Configuration What is HSRP ? HSRP (Hot Standby Router Protocol) is a redundancy protocol for setting up a fault-tolerant default gateway in a LAN environment. This is a Cisco proprietary protocol. The standard protocol is VRRP (Virtual Router Redundancy Protocol) The primary router with the highest configured priority...

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Cisco paket tracer 6 latest

Cisco Packet Tracer v6.0. 1 Cisco Packet tracer is a powerful network simulation tools, which helps a network engineer to design a network virtually. Recently updated their version. The previous version was 5.3.3. That version didn’t support IP v 6, but this version support IP v 6. Also some other essential elements you can get easily. This is...

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