Case Study: Dual-Homed Connections to the Internet

Because it's becoming common to see networks dual-homed to the Internet through two service providers, one of the questions people ask is how to load share between these multiple connections. There are two sides to this equation: inbound traffic and outbound traffic. Because asymmetric routing is very common throughout the Internet, the two traffic flows need to be dealt with separately. Along with these two issues, the effects of the use of default routing versus receiving partial/full routing from the providers will also be explored. The last section in this case study deals with the danger of becoming a transit AS.

For the discussion that follows, use Figure 8-9 as a network to work with. ...

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