September 2001
Intermediate to advanced
352 pages
11h 1m
English
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Additional Resource Records
There are a number of resource records that we haven’t covered yet in this book. The first of these, HINFO, has been around since the beginning but hasn’t been widely used. The others were defined in RFC 1183 and several successive RFCs. Most are experimental, but some are on the standards track and are coming into more prevalent use. We’ll describe them here to give you a little head start in getting used to them.
Host Information
HINFO stands for host information. The record-specific data is a pair of strings identifying the host’s hardware type and operating system. The strings are supposed to come from the MACHINE NAMES and OPERATING SYSTEM NAMES listed in the Assigned Numbers RFC (currently RFC 1700), but this requirement is not enforced; you can use your own abbreviations. The RFC isn’t at all comprehensive, so it’s quite possible you won’t find your system in the list anyway. Originally, host information records were intended to let services like FTP determine how to interact with a remote system. This would have made it possible to negotiate data type transformations automatically, for example. Unfortunately, this didn’t happen—few sites supply accurate HINFO values for all their systems. Some network administrators use HINFO records to help them keep track of the machine types, instead of recording the machine types in a database or a notebook. Here are two examples of HINFO records (note that the values in the CPU type and Operating system ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.