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Configure Dynamic Port Address Translations (PAT) in Cisco IOS Router

Both static and dynamic Network Address Translations (NAT) allows the translation of local address to global address and allowing it to communicate to outside of the local area network. The problem is the number of global address is usually a lot less than the local address requiring the translation. To overcome this issue, Cisco supports […]
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Configure GLBP in Cisco IOS Router

Improvement at the gateway level is now more than just about redundancy as we can use Cisco’s sophisticated feature called GLBP or Gateway Load Balancing Protocol. Just by looking at the name, we can easily guess its superior value compared to HSRP or VRRP. In HSRP or VRRP, only the active/master router that do the […]
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Configure VRRP in Cisco IOS Router

VRRP or Virtual Router Redundancy Protocol is the open standard version of Cisco’s HSRP. It is also used to provide redundancy of a gateway by using multiple routers, but since it’s an open standard then it can be implemented using routers from vendors other than Cisco. Most of VRRP logic are very similar to HSRP, […]
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Configure Static NAT in Cisco IOS Router

Network Address Translation or NAT is a mechanism of mapping local address on the inside interface of a router with global address on the outside interface. For outgoing packets, router will translate the source local address to a global address. Reversely, router will forward incoming packets for a global address to its local address. This […]
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Configure Dynamic NAT in Cisco IOS Router

Network Address Translation or NAT is a feature that enables access to the internet from a private network. Therefore, it becomes a mandatory requirement for any kind of network unless it is an isolated one. NAT works by translating the local address using global address as the packets moving back and forth towards the public […]
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Configure HSRP in Cisco IOS Router

HSRP or Hot-Standby Routing Protocol is a mechanism developed by Cisco to add redundancy at the gateway of a subnet. The idea of HSRP is using multiple routers to serve as a gateway using one virtual IP address. One of the routers will be designated as the active gateway, and if it’s become unreachable there […]
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Understanding Cisco IOS Command Line Modes

Cisco Command Line Interface (CLI) is the main interface where we will interact with Cisco IOS devices. CLI is accessible directly via console cable or remotely via methods such as Telnet/SSH. From here, we can do things such as monitoring device status or changing configuration. Cisco has divided its CLI into several different modes. Understanding […]