24 lines
1.4 KiB
Text
24 lines
1.4 KiB
Text
Host is a very powerful DNS query and testing command-line tool. There are
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many differences with the ancient version of the program with the same name
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that is included in the BIND-4 and BIND-8 distributions, including:
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- Major overhaul of the entire code. Very rigid error checking, with more
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verbose error messages. Code is extensively documented.
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- It is now possible to do recursive listings into delegated zones.
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- Maintain resource record statistics and count of hosts during zone listings.
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- Check for various extraneous conditions during zone listings.
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- Check for illegal domain names containing invalid characters.
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- Verify that certain domain names represent canonical host names.
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- Perform ttl consistency checking during zone listings.
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- Exploit multiple server addresses if available.
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- Option to exploit only primary server for zone transfers.
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- Option to exclude info from names that do not reside in a zone.
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- Implement timeout handling during connect and read.
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- Write resource record output to optional log file.
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- Special MB tracing by recursively expanding MR and MG records.
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- Special modes to check SOA records at each name server for a zone.
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- Special mode to check reverse mappings of host addresses.
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- Configurable default options in HOST_DEFAULTS environment variable.
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- Basic experimental NSAP support as defined in RFC 1637.
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- Implement new resource record types from RFCs 1183, 1348, 1664, 1712,
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1876 and 1886.
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