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Man Pages


Manual Reference Pages  -  ETHERS (5)

NAME

ethers - ethernet address database

CONTENTS

Description
Files
See Also
History

DESCRIPTION

The ethers database contains information regarding known 48-bit ethernet addresses of hosts on an Internetwork. The data is stored in a file called /etc/ethers in the following format:

Items are separated by any number of blanks and/or tab characters. A ‘‘#’’ at the start of a line indicates the beginning of a comment that extends to the end of the line. A ‘‘+’’ at the start of a line will cause the ethers(3) library functions to use data stored in the NIS ethers.byname and ethers.byaddr maps in addition to the data in the /etc/ethers file.

An ethernet address is expressed in ASCII form as "x:x:x:x:x:x" where x is a hexadecimal value between 0x00 and 0xFF. The address values should be in network order. Hostnames specified in the /etc/ethers database should correspond to entries in the hosts(5) file.

The ether_line function in the standard C library can be used to break individual lines in the /etc/ethers database into their individual components: a binary Ethernet address stored as an ether_addr structure, and a hostname stored as a character string.

FILES

/etc/ethers The ethers file resides in /etc.

SEE ALSO

ethers(3), yp(8)

HISTORY

The ethers format is based on the format used in SunOS 4.1.x.
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