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1.1 root 1: .\" Copyright (c) 1983 Regents of the University of California.
2: .\" All rights reserved. The Berkeley software License Agreement
3: .\" specifies the terms and conditions for redistribution.
4: .\"
5: .\" @(#)htable.8 6.3 (Berkeley) 5/22/86
6: .\"
7: .TH HTABLE 8 "May 22, 1986"
8: .UC 5
9: .SH NAME
10: htable \- convert NIC standard format host tables
11: .SH SYNOPSIS
12: .B /etc/htable
13: [
14: .B \-c
15: .I connected-nets
16: ] [
17: .B \-l
18: .I local-nets
19: ]
20: .I file
21: .SH DESCRIPTION
22: .I Htable
23: is used to convert host files in the format specified
24: in Internet RFC 810 to the format used by the network
25: library routines. Three files are created as a result
26: of running
27: .IR htable :
28: .IR hosts ,
29: .IR networks ,
30: and
31: .IR gateways .
32: The
33: .I hosts
34: file may be used by the
35: .IR gethostbyname (3N)
36: routines in mapping host names to addresses
37: if the nameserver,
38: .IR named (8),
39: is not used.
40: The
41: .I networks
42: file is used by the
43: .IR getnetent (3N)
44: routines in mapping network names to numbers.
45: The
46: .I gateways
47: file may be used by the routing daemon
48: in identifying ``passive'' Internet gateways;
49: see
50: .IR routed (8C)
51: for an explanation.
52: .PP
53: If any of the files
54: .IR localhosts ,
55: .IR localnetworks ,
56: or
57: .I localgateways
58: are present in the current directory,
59: the file's contents is prepended to the
60: output file.
61: Of these, only the gateways file is interpreted.
62: This allows sites to maintain local aliases and
63: entries which are not normally present in the
64: master database.
65: Only one gateway to each network will be placed in the gateways file;
66: a gateway listed in the localgateways file will override any in the
67: input file.
68: .PP
69: If the gateways file is to be used,
70: a list of networks to which the host is directly connected
71: is specified with the
72: .B \-c
73: flag.
74: The networks, separated by commas,
75: may be given by name or in Internet-standard dot notation,
76: e.g.
77: .B \-c
78: arpanet,128.32,local-ether-net.
79: .I Htable
80: only includes gateways
81: which are directly connected to one of the networks specified,
82: or which can be reached from another gateway on a connected net.
83: .PP
84: If the
85: .B \-l
86: option is given with a list of networks (in the same format as for
87: .BR \-c ),
88: these networks will be treated as ``local,''
89: and information about hosts on local networks is
90: taken only from the localhosts file.
91: Entries for local hosts from the main database will be omitted.
92: This allows the localhosts file to completely override
93: any entries in the input file.
94: .PP
95: .I Htable
96: is best used in conjunction with the
97: .IR gettable (8C)
98: program which retrieves the NIC database from a host.
99: .SH "SEE ALSO"
100: intro(3N),
101: gettable(8C),
102: named(8)
103: .SH BUGS
104: If the name-domain system provided network name mapping well as host
105: name mapping,
106: .I htable
107: would no longer be needed.
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