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Eicon Connections for Linux User’s Guide

page 51

Testing Sys-1/Sys-2 Communications

The two systems are now ready to exchange IP datagrams over the X.25, Frame Relay, or PPP

link that connects them together. The TCP/IP ping utility provides a convenient way of doing

this.

The ping utility provides real network traffic by means of ICMP Echo Requests. It transmits

datagrams from one system to another system identified by the specified IP address. Reply

datagrams contain items such as a sequence number, the number of datagrams sent so far,

and the round-trip time for each datagram. The sequence number indicates the datagram to

which a reply corresponds.

The reply from the other system fits on a single line, and a new reply line is displayed once

every few seconds. You can use the interrupt key (Ctrl-Break or Delete) to terminate ping

at any time, or you can specify the number of datagrams to be sent on the ping command

line. When ping terminates, several summary statistic lines are displayed.

Run ping on Sys-1 as shown below. A sample of the statistical information displayed by ping

is also included. The IP address of Sys-2 is included on the ping command line, indicating the

system with which the communications are to occur.

[Sys-1]# ping 192.1.100.2

PING 192.1.100.2: 56 data bytes

64 bytes from 192.1.100.2: icmp_seq=0. time=125. ms

64 bytes from 192.1.100.2: icmp_seq=1. time=105. ms

64 bytes from 192.1.100.2: icmp_seq=2. time=110. ms

64 bytes from 192.1.100.2: icmp_seq=3. time=105. ms

64 bytes from 192.1.100.2: icmp_seq=4. time=105. ms

64 bytes from 192.1.100.2: icmp_seq=5. time=115. ms

64 bytes from 192.1.100.2: icmp_seq=6. time=110. ms

64 bytes from 192.1.100.2: icmp_seq=7. time=110. ms

64 bytes from 192.1.100.2: icmp_seq=8. time=105. ms

64 bytes from 192.1.100.2: icmp_seq=9. time=110. ms

64 bytes from 192.1.100.2: icmp_seq=10. time=115. ms

64 bytes from 192.1.100.2: icmp_seq=11. time=115. ms

64 bytes from 192.1.100.2: icmp_seq=12. time=110. ms

64 bytes from 192.1.100.2: icmp_seq=13. time=110. ms

----192.1.100.2 PING Statistics----

14 packets transmitted, 14 packets received, 0% packet loss

round-trip (ms) min/avg/max = 103/114/125

In this example, the interrupt key (e.g., Ctrl-Break or Delete) was pressed after 14

datagrams were sent. The ping utility then displayed the summary statistics and halted. The

term “packet” used on the summary lines at the end of the sample ping display is equivalent

to the term “datagram” as in “IP datagram.”

You can also run ping on Sys-2 to show a more realistic traffic pattern, with the two systems

simultaneously communicating with each other. You can continue adding Eiconcard Routing

Services systems and running ping as desired.

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Eicon Networks S52 Guide de l'utilisateur Page 53

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