ethers.5

<B>Digital的Unix操作系统VAX 4.2源码</B>

.TH ethers 5
.SH Name
ethers \- database that maps Ethernet addresses to hostnames
.SH Description
The
.PN /etc/ethers
.NXR "ethers file" "description"
file is used in conjunction with the reverse address resolution
protocol daemon,
.PN rarpd ,
to map Ethernet addresses to hostnames.  
It contains information about the
known (48-bit) Ethernet addresses of hosts on the Internet.
.PP
For each host on an Ethernet,
a single line should be present in the file with the following information:
.PP
\fIEthernet-address        official-host-name\fR
.PP
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.
.PP
The standard form for Ethernet addresses is:
.PP
\fIx:x:x:x:x:x\fR
.PP
The
.I x
is a hexadecimal number between 0 and ff, representing 1 byte.
The address bytes are always in network order.
.PP
Hostnames can contain any printable character other than a
space, tab, newline, or number sign (#).
.PP
Hostnames in the
.PN /etc/ethers
file should correspond to the hostnames in the
.PN /etc/hosts 
file or to those provided by the name service.
.NXR "ethers file" "host name restrictions"
.SH Examples
The following is a sample 
.PN ethers 
file:
.EX0
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
.EE
.NXR(e) "ethers file" 
.SH See Also
ethers(3n), hosts(5), rarpd(8c)
.br
.I "Introduction to Networking and Distributed System Services"