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ethers(5) [netbsd man page]

ETHERS(5)						      BSD File Formats Manual							 ETHERS(5)

ethers -- Ethernet host name data base DESCRIPTION
The ethers file maps Ethernet MAC addresses to host names. Lines consist of an address and a host name, separated by any number of blanks and/or tab characters. A '#' character indicates the beginning of a comment; characters up to the end of the line are not interpreted by routines which search the file. Each line in ethers has the format: ethernet-MAC-address hostname-or-IP Ethernet MAC addresses are expressed as six hexadecimal numbers separated by colons, e.g. "08:00:20:00:5a:bc". The functions described in ethers(3) and ether_aton(3) can read and produce this format. The traditional use of ethers involved using hostnames for the second argument. This may not be suitable for machines that don't have a com- mon MAC address for all interfaces (i.e., just about every non Sun machine). There should be no problem in using an IP address as the second field if you wish to differentiate between different interfaces on a system. FILES
/etc/ethers The ethers file resides in /etc. SEE ALSO
ethers(3) HISTORY
The ethers file format was adopted from SunOS and appeared in NetBSD 1.0. BUGS
A name server should be used instead of a static file. BSD
November 7, 2000 BSD

Check Out this Related Man Page

ethers(5)							File Formats Manual							 ethers(5)

       ethers - database that maps Ethernet addresses to hostnames

       The  file  is used in conjunction with the reverse address resolution protocol daemon, to map Ethernet addresses to hostnames.  It contains
       information about the known (48-bit) Ethernet addresses of hosts on the Internet.

       For each host on an Ethernet, a single line should be present in the file with the following information:

       Ethernet-address        official-host-name

       Items are separated by one or more spaces or tabs.  A number sign (#) indicates the beginning of a comment that extends to the end of line.

       The standard form for Ethernet addresses is:


       The x is a hexadecimal number between 0 and ff, representing 1 byte.  The address bytes are always in network order.

       Hostnames can contain any printable character other than a space, tab, newline, or number sign (#).

       Hostnames in the file should correspond to the hostnames in the file or to those provided by the name service.

       The following is a sample file: 08:00:20:01:e5:1c       host1	    # Comments go here 08:00:20:01:d0:4c       host2	    # Comments	go
       here 08:00:20:01:e0:1d	    host3	 # Comments go here 08:00:20:00:c2:4e	    host4	 # Comments go here

See Also
       ethers(3n), hosts(5), rarpd(8c)
       Introduction to Networking and Distributed System Services

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