Author: Rene Molenaar
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…
Read More »NAT Virtual Interface

Scenario: After passing the CCNA exam you feel like you could do anything with NAT. You just started at a new job as a junior network engineer but to your surprise the router you are working on doesn’t…
Read More »NAT Overlapping Networks

Scenario: Fruity international has bought Juicy Corporate and is merging the companies into a new one called “Fruity Juicy”. You are the network engineer responsible for the network migration. Unfortunately both networks are using the same address space…
Read More »Static PAT (Port Forwarding)

Scenario: You are a trainee for a large international website covering a wide range of topics on automobiles. You are using NAT and PAT for connectivity to the Internet but you also have a number of hosts on…
Read More »NAT and Route-Map

Scenario: Your network has two connections to the outside world. One is used for the Internet and the other one connects to a partner. You are using NAT to translate the IP addresses of your LAN but you…
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