gateways(5) — AIX PS/2 1.2.1



GATEWAYS(5,F)               AIX TCP/IP User's Guide               GATEWAYS(5,F)



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gateways



PURPOSE

Defines and maintains routing information.

SYNOPSIS

/etc/gateways

DESCRIPTION

The /etc/gateways file identifies gateways for the routed command.  Ordinarily,
the routed command queries the network, building routing tables from routing
information transmitted by other hosts that are directly connected to the
network.  However, there may be gateways that the routed command cannot
identify through its queries (distant gateways).  Such gateways should be
identified in /etc/gateways, which routed reads when it starts.

The general format of an entry in /etc/gateways is:

  destination name1 gateway name2 metric value type

Following is a brief description of each element in a /etc/gateways file entry:

destination A keyword that indicates whether the route is to a network or to a
            specific host.  The two possible keywords are net and host.

name1       The name associated with destination, name1, can be either a
            symbolic name (as used in /etc/hosts or /etc/networks) or an
            Internet address specified in dotted decimal format.

gateway     Indicator that the following string identifies the gateway host.

name2       Name or address of the gateway host to which messages should be
            forwarded.

metric      Indicator that the next string represents the hop count to the
            destination host or network.

value       The hop count.

type        A keyword that indicates whether the gateway should be treated as
            active or passive.  The two possible keywords are active and
            passive.  An active gateway is treated like a network interface
            (that is, it is expected to exchange routing information and if it
            does not do so for a period of time, the route associated with it
            is deleted).  A passive gateway is not expected to exchange routing
            information.  Information about it is maintained in the routing



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GATEWAYS(5,F)               AIX TCP/IP User's Guide               GATEWAYS(5,F)



            tables indefinitely and is included in any routing information that
            is transmitted.





















































Processed October 29, 1990       GATEWAYS(5,F)                                2



GATEWAYS(5,F)               AIX TCP/IP User's Guide               GATEWAYS(5,F)




EXAMPLES

Following are four sample /etc/gateways entries:

  1. A route to a network, "net2", through the gateway, "host4".  The hop count
    metric to "net2" is "4" and the gateway is treated as "passive".

      net net2 gateway host4 metric 4 passive

  2. A route like the one in the previous example except that it is to a
    specific host (rather than to a network):

      host host2 gateway host4 metric 4 passive

  3. A route to a specific host, "host10", through the gateway, "192.9.201.5".
    The hop count metric to "host10" is "9" and the gateway is treated as
    "active".

      host host10 gateway 192.9.201.5 metric 9 active

  4. A route like the one in the previous example except that the gateway is
    treated as "passive" (rather than "active"):

      host host10 gateway 192.9.201.5 metric 9 passive

FILES

/usr/lpp/tcpip/samples/gateways


RELATED INFORMATION

In this book:  "routed"





















Processed October 29, 1990       GATEWAYS(5,F)                                3

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