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Release It! by Michael T. Nygard

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Routing

Because servers in production usually have multiple network interfaces, questions will sometimes arise about which interfaces particular kinds of traffic should traverse. For example, it is relatively common to see an application server with a front-end network interface connected to one VLAN for communication to the web servers and with a back-end network interface connected to a different VLAN for communication to the database servers. In this case, the server must be told which interface to use in order to reach a particular destination IP address.

In the case of nearby servers, the routes are probably easy; they will just be based on the subnet addresses. In the example of the application server, the back-end interface probably ...

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