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VRRP (Virtual Router Redundancy Protocol)
Scenario: Internet traffic is becoming more and more important since the company you are working for is focused on e-commerce. Every minute that their webservers running webshops are unavailable is causing profit loss. The company decided need a…
Read More »IP Event Dampening
Scenario: Garden Tools inc. has some trouble with their network. Every now and then the serial link fails which results in flapping networks for their routing protocol EIGRP. You want to configure damping so this is no issue…
Read More »DNS Server
Scenario: You are responsible for the network of a major internation hotel organization. You make sure that all the guests can use the Internet services. One of the things you need to do is ensure DNS lookups can…
Read More »Server Load Balancing (SLB)
Scenario: You are the senior network engineer for a large online webshop called “Booky Wooky”. One of your load balancers recently failed and you don’t have any replacement…business hasn’t been so good since the ereaders have been launched…
Read More »Web Cache Communication Protocol (WCCP) V1
Scenario: Many users on your network are using the Internet but the connection you have from the ISP is quite expensive. You want to get the most out of your connection and ensure users don’t load pages from…
Read More »UDP Forwarding
Scenario: The smurf village hasn’t seen many changes the last 30 years but they did install a village-wide network using routers from a popular brand. Unfortanely for you there is one legacy TFTP application that needs broadcast capability…
Read More »IP Directed Broadcast
Scenario: The smurfs got tired of recording cartoons so they decided to become network engineers. Unfortunately they are still using a very old application that only works using broadcast traffic. You need to change the network so it’s…
Read More »IP Output Packet Accounting
Scenario: Your boss is very interested to know which MAC addresses on the network are responsible for most traffic. Besides MAC addresses you would also like to see how many packets are marked with IP precedence. Time for…
Read More »IP Precedence and MAC Address Accounting
Scenario: Your boss is very interested to know which MAC addresses on the network are responsible for most traffic. Besides MAC addresses you would also like to see how many packets are marked with IP precedence. Time for…
Read More »NAT Extendable
Scenario: Your NAT configuration seems to work fine but you need to create a couple of static entries so one of your internal hosts is reachable using multiple IP addresses. Let’s see what you can do! Goal: All…
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