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Dynamic Multipoint VPN DMVPN Architecture

by ShahedMay 12, 2011October 24, 20151

Dynamic Multipoint VPN DMVPN Architecture: There is a number of different ways an engineer can implement a DMVPN network. The fact that there is a variety of DMVPN Architecture models, each one with its caveats and requirements, means that almost any VPN requirement can be met as long as we have the correct hardware, software license and knowledge to implement it. [boxads] Speaking of implementation, no matter how complex the DMVPN network might get, it’s pretty straight forward once it’s broken down into sections. Engineers already working with complex DMVPNs can appreciate this and see the simplicity in configuration they …

by ShahedMay 8, 2011October 24, 20150

DMVPN Configuration: DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks. In short, DMVPN Configuration is combination of the following technologies: [boxads] 1) Multipoint GRE (mGRE) 2) Next-Hop Resolution Protocol (NHRP) 4) Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP) 3) Dynamic IPsec encryption 5) Cisco Express Forwarding (CEF) Assuming that reader has a general understanding of what DMVPN is and a solid understanding of IPsec/CEF, we are going to describe the role and function of each component in details. In this post we are going to illustrate two major phases of DMVPN …

by ShahedApril 11, 2011October 22, 20150

BGP Attributes Categories BGP Attributes Categories are 1) WELL-KNOWN, MANDATORY , 2) WELL-KNOWN, DISCRETIONARY, 3) OPTIONAL, TRANSITIVE, 4) OPTIONAL, NON-TRANSITIVE. details are: [boxads] WELL-KNOWN, MANDATORY AS-path: A list of the Autonomous Systems (AS) numbers that a route passes through to reach the destination. As the update passes through an AS the AS number is inserted at the beginning of the list. The AS-path attribute has a reverse-order list of AS passed through to get to the destination. Next-hop: The next-hop address that is used to reach the destination. Origin: Indicates how BGP learned a particular route. There are three possible …

by ShahedApril 6, 2011October 22, 20150

BGP Routing Protocol Overview Hi ! Today i will discuss about BGP Routing Protocol Overview. BGP is an Border gateway protocol, BGP mainly use for connect between different networks. It is the protocol used between Internet service providers (ISPs) and also can be used between an Enterprise and an ISP. BGP was built for reliability, scalability, and control. [boxads] BGP stands for Border Gateway Protocol. Routers running BGP are termed BGP speakers. BGP uses the concept of autonomous systems (AS). An autonomous system is a group of networks under a common administration. The Internet Assigned Numbers Authority (IANA) assigns AS …

by ShahedMarch 15, 2011January 21, 20151

OSPF Load Balancing: [boxads] Today I will show how to configure OSPF load balancing, If we follow bellow example we see a client is connected through two WAN connections with two broadband routers that both are use for Internet routing. We will enable and disable OSPF load balancing packets that are sourcing from the HOST to the WEB SERVER. Following the diagram: Now lets go our OSPF Load Balancing Configuration part……….. Router R1: R1# R1#conf t R1(config)#ip cef R1(config)#int loopback 0 R1(config-if)#ip address 1.1.1.1 255.255.255.255 R1(config-if)#ip ospf network point-to-point R1(config-if)#exit

by ShahedMarch 7, 2011October 30, 20150

NAT PAT Configuration Packet Tracer Today i will discuss how to configure NAT PAT Configuration Packet Tracer simulator. Network address translation (NAT) is the process of modifying IP address information in IP packet headers while in transit across a traffic routing device. [boxads] There are two different types of NAT: NAT Static NAT: The simplest type of NAT provides a one-to-one translation of IP addresses. It is often also referred to as one-to-one NAT. In this type of NAT only the IP addresses, IP header checksum and any higher level checksums that include the IP address need to be changed. …