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The computer file hosts is an operating system file that maps hostnames to IP addresses.It is a plain text file. Originally a file named HOSTS.TXT was manually maintained and made available via file sharing by Stanford Research Institute for the ARPANET membership, containing the hostnames and address of hosts as contributed for inclusion by member organizations.
This file lists databases (such as passwd, shadow and group), and one or more sources for obtaining that information. Examples for sources are files for local files, ldap for the Lightweight Directory Access Protocol, nis for the Network Information Service, nisplus for NIS+, dns for the Domain Name System (DNS), and wins for Windows Internet ...
A filesystem ACL is a data structure (usually a table) containing entries that specify individual user or group rights to specific system objects such as programs, processes, or files. These entries are known as access-control entries (ACEs) in the Microsoft Windows NT, [4] OpenVMS, and Unix-like operating systems such as Linux, macOS, and ...
Using a simpler, more memorable name in place of a host's numerical address dates back to the ARPANET era. The Stanford Research Institute (now SRI International) maintained a text file named HOSTS.TXT that mapped host names to the numerical addresses of computers on the ARPANET.
The records returned may not be complete. For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned. Usually referred to as ANY (e.g., in dig, Windows nslookup, and Wireshark).
If you name them then you get unknown:hpdj930c, and unknown1:pagepro13502 for example. Without those names in the hosts file you would instead get unknown:192.168.1.121 and unknown1:192.168.1.123 for example. So making hosts file entries is the only way those printers will get a name. The name may look goofy, but that is the best you will ever get.
priority: the priority of the target host, lower value means more preferred. weight: A relative weight for records with the same priority, higher value means higher chance of getting picked. port: the TCP or UDP port on which the service is to be found. target: the canonical hostname of the machine providing the service, ending in a dot.
host.subdel.example. A No wildcard will match because subdel.example. exists and is a zone cut, putting host.subdel.example. into a different DNS zone. Even if host.subdel.example. does not exist in the other zone, a wildcard will not be used from the parent zone. ghost.*.example. MX