December 2005
Intermediate to advanced
252 pages
8h 55m
English
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Chapter 4. Browsing for Services
Once you are on a network where you have a working IP address and hostname, you are in a position to begin doing some useful networking. Your IP address may change over time, particularly if you are using IPv4 link-local addressing, but your Multicast DNS hostname generally won’t. People on the local network can access services running on your machine using your mDNS hostname anywhere a conventional hostname would be used, automatically connecting to your current address, even if your address changed since the last time they connected. People can use your mDNS hostname on the command line to connect with FTP or SSH commands. If your machine is running a web server, others can connec[t to it by entering your mDNS hostname into their web browser. Note that web servers can take many forms apart from the conventional collection of static pages: if you have a typical network-connected camera with Multicast DNS, you can connect by typing its name (e.g., netcam.local) into your web browser. This is, of course, a big improvement over having to know the IP address to type, but in some ways we’ve merely moved the problem, not solved it. Instead of having to know what IP address to type, you now have to know what name to type. In the case of IPv6 addresses, which are 20-40 characters long, a short, memorable hostname is definitely an improvement, but imagine how much better it would be if you didn’t have to know the name at all, and your web browser could simply ...
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