Eicon Networks S52 Podręcznik Użytkownika Pobierz pdf (Strona 42)

Using Eiconcard Routing Services

page 40

In this case, Sys-2 functions as a gateway to the 192.218.20 network.

Make sure each routing table entry you add to a host’s /etc/gateways file is correct before

adding another entry. You may want to test the route connection, as routed will not inform

you of any errors in /etc/gateways, such as an incorrectly specified IP address.

Note: If changes are made to the /etc/gateways file, the routed daemon must be restarted

with the -s option.

Displaying IP-routing Entries

You can use the netstat command to display information related to the IP routing tables. The

-i option displays information concerning the interfaces for entries in your system’s IP-routing

table, and the -r option presents the static and currently active routing entries.

You can also use the -n option to specify the use of dot notation. Addresses displayed by

netstat are then numeric values, rather than the symbolic names assigned by the /etc/hosts

file. (If an address does not have an assigned name in /etc/hosts, the netstat command

displays the numeric value.)

For example, the following commands show the entries you would see after adding the sample

entry to Sys-1’s /etc/gateways file, assuming the routed daemon had been reinitialized and

the route connection had been used to send and transmit data:

netstat -r -n

netstat -i

The interface name eic0 identifies the Eiconcard Routing Services interface used by Dialogic.

The interface name lo0 is the default IP interface that enables the host to send or transmit

data to itself.

Note: Refer to the Linux system administrator documentation for more information on IP

routing if necessary.

Testing Your Installation

If you have at least two Linux systems that have an Eiconcard and Eiconcard Routing Services

installed, consider setting up a simple test system as suggested here. This will help you over

some of the initial hurdles inherent in dealing with internetworks and routers. Only two Linux

systems are used in this test system. You may add additional systems to test more complex

configurations.

Routing tables

Destination Gateway Flags Refcnt Use Interface

127.0.0.1 127.0.0.1 UH 1 0 lo0

192.1.100 192.1.100.2 U 2 392 eic0

192.218.20 192.1.100.2 UG 2 392 eic0

Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Collis

lo0 2048 loopback localhost 24 0 24 0 0

eic0 1500 192.1.100 192.1.100.2 4 0 410 0 0

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 90 91

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Eicon Networks S52 Podręcznik Użytkownika Strona 42