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1 perry 1 GATEWAYS
2 !!!GATEWAYS
3 NAME
4 DESCRIPTION
5 FILES
6 SEE ALSO
7 HISTORY
8 AUTHOR
9 ----
10 !!NAME
11
12
13 gateways - File which lists gateways for routed
14 !!DESCRIPTION
15
16
17 __/etc/gateways__ is used by
18 routed(8); the file contains a list of gateways which
19 may not be located by using only information from the
20 SIOGIFCONF ioctl(2) when routed(8) is
21 started.
22
23
24 Gateways specified in __/etc/gateways__ should be marked
25 passive if they are not expected to exchange routing
26 information, while gateways marked active should be willing
27 to exchange routing information (i.e. they should have a
28 routed(8) process running on the machine). Routes
29 through passive gateways are installed in the kernel's
30 routing tables once upon startup. Such routes are not
31 included in any routing information transmitted. Active
32 gateways are treated equally to network interfaces. Routing
33 information is distributed to the gateway and if no routing
34 information is received for a period of time, the associated
35 route is deleted. Gateways marked ''external'' are also
36 passive, but are not placed in the kernel routing table nor
37 are they included in routing updates. The function of
38 external entries is to inform routed(8) that another
39 routing process will install such a route, and that
40 alternate routes to that destination should not be
41 installed. Such entries are only required when both routers
42 may learn of routes to the same destination.
43
44
45 __/etc/gateways__ is comprised of a series of lines, each
46 in the following format:
47
48
49 [[ __net__ | __host__ ] ''name1'' __gateway__
50 ''name2'' __metric__ ''value'' [[ __passive__ |
51 __active__ | __external__ ]
52
53
54 The __net__ or __host__ keyword indicates if the route
55 is to a network or specific host.
56
57
58 ''Name1'' is the name of the destination network or host.
59 This may be a symbolic name located in ''/etc/networks''
60 or ''/etc/hosts'' (or, if started after named(8),
61 known to the name server), or an Internet address specified
62 in ``dot'' notation; see inet(3).
63
64
65 ''Name2'' is the name or address of the gateway to which
66 messages should be forwarded.
67
68
69 ''Value'' is a metric indicating the hop count to the
70 destination host or network.
71
72
73 One of the keywords __passive, active__ or
74 __external__ indicates if the gateway should be treated
75 as ''passive'' or ''active'' (as described above), or
76 whether the gateway is ''external'' to the scope of the
77 routed(8) protocol.
78
79
80 Internetwork routers that are directly attached to the
81 Arpanet or Milnet should use the Exterior Gateway Protocol
82 EGP to gather routing information rather then using a static
83 routing table of passive gateways. EGP is required in order
84 to provide routes for local networks to the rest of the
85 Internet system.
86 !!FILES
87
88
89 ''/etc/gateways''
90 !!SEE ALSO
91
92
93 ''Internet Transport Protocols'', XSIS 028112, Xerox
94 System Integration Standard, routed(8).
95 !!HISTORY
96
97
98 The routed(8) command appeared in
99 4.2BSD.
100 !!AUTHOR
101
102
103 This manpage was extracted from routed(8) by Steve
104 Kostecke,
105 __
106 ----
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