ethers(4)                      DG/UX R4.11MU05                     ethers(4)


NAME
       ethers - Ethernet address to hostname database or YP domain

DESCRIPTION
       The ethers file contains information regarding the known (48 bit)
       Ethernet addresses of hosts on the Internet.  For each host on an
       Ethernet, a single line should be present with the following
       information:

            ethernetaddress  officialhostname

       Separate items by any number of blanks and/or TAB characters.  A `#'
       indicates the beginning of a comment extending to the end of line.

       The standard form for Ethernet addresses is ``x:x:x:x:x:x'' where x
       is a hexadecimal number between 0 and ff, representing one byte.  The
       address bytes are always in network order.  Host names may contain
       any printable character other than a space, tab, newline, or comment
       character.  It is intended that hostnames in the ethers file
       correspond to the hostnames in the hosts(4) file.

       The etherline() routine from the Ethernet address manipulation
       library, ethers(3N) may be used to scan lines of the ethers file.

EXAMPLE
       The following is a sample /etc/ethers file:

       8:0:1b:0:a0:17 dg1
       0:0:77:1a:0:6a sales
       8:0:20:0:a7:5d sun1

       If you use the domain name system, you should specify fully-qualified
       names in addition to official hostnames.  Here is the same sample
       /etc/ethers file including fully-qualified names:

       8:0:1b:0:a0:17 dg1
       0:0:77:1a:0:6a sales
       8:0:20:0:a7:5d sun1
       8:0:1b:0:a0:17 dg1.tnt.acme.com
       0:0:77:1a:0:6a sales.tnt.acme.com
       8:0:20:0:a7:5d sun1.tnt.acme.com

       For more information about the domain name system, see Managing
       TCP/IP on the DG/UX (Trademark) System.

FILES
       /etc/ethers

SEE ALSO
       ethers(3N), hosts(4)


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