Question

I am trying to ping 4 different IP address after login to a remote switch using expect,login part works fine and the first 2 ping command (send); but it skips the 3rd ping command and go for 4th ping. And most of the time before showing the ping summary it exits the script.

My Script:

 #!/usr/bin/expect
 spawn telnet 192.168.xx.xx
 expect "Username:" 
 send "username\r"
 expect "Password:"
 send "password\r"
 expect ">"
 send "ping -c 20 192.168.1.10\r"
 expect ">"
 send "ping -c 20 192.168.10.22\r"
 expect ">"
 send "ping -c 20 192.168.10.33\r"
 expect ">"
 send "ping -c 20 192.168.11.10\r"
 expect ">"
 send "quit\r" # command to exit from switch 
 expect eof

I have tried adding “sleep 4” before every send command but the results are same.

Output:

<switch>ping -c 20 192.168.1.20
  PING 192.168.1.20: 56  data bytes, press CTRL_C to break
    Reply from 192.168.1.20: bytes=56 Sequence=1 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=2 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=3 ttl=255 time=101 ms
    Reply from 192.168.1.20: bytes=56 Sequence=4 ttl=255 time=2 ms
    Reply from 192.168.1.20: bytes=56 Sequence=5 ttl=255 time=2 ms
    Reply from 192.168.1.20: bytes=56 Sequence=6 ttl=255 time=2 ms
    Reply from 192.168.1.20: bytes=56 Sequence=7 ttl=255 time=102 ms
    Reply from 192.168.1.20: bytes=56 Sequence=8 ttl=255 time=2 ms
    Reply from 192.168.1.20: bytes=56 Sequence=9 ttl=255 time=3 ms
    Reply from 192.168.1.20: bytes=56 Sequence=10 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=11 ttl=255 time=108 ms
    Reply from 192.168.1.20: bytes=56 Sequence=12 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=13 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=14 ttl=255 time=2 ms
    Reply from 192.168.1.20: bytes=56 Sequence=15 ttl=255 time=130 ms
    Reply from 192.168.1.20: bytes=56 Sequence=16 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=17 ttl=255 time=2 ms
    Reply from 192.168.1.20: bytes=56 Sequence=18 ttl=255 time=1 ms
    Reply from 192.168.1.20: bytes=56 Sequence=19 ttl=255 time=160 ms
    Reply from 192.168.1.20: bytes=56 Sequence=20 ttl=255 time=1 ms

  --- 192.168.1.20 ping statistics ---
    20 packet(s) transmitted
    20 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 1/31/160 ms

<switch>ping -c 20 192.168.10.22
  PING 192.168.10.22: 56  data bytes, press CTRL_C to break
    Reply from 192.168.10.22: bytes=56 Sequence=1 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=2 ttl=255 time=12 ms
    Reply from 192.168.10.22: bytes=56 Sequence=3 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=4 ttl=255 time=35 ms
    Reply from 192.168.10.22: bytes=56 Sequence=5 ttl=255 time=2 ms
    Reply from 192.168.10.22: bytes=56 Sequence=6 ttl=255 time=16 ms
    Reply from 192.168.10.22: bytes=56 Sequence=7 ttl=255 time=2 ms
    Reply from 192.168.10.22: bytes=56 Sequence=8 ttl=255 time=29 ms
    Reply from 192.168.10.22: bytes=56 Sequence=9 ttl=255 time=4 ms
    Reply from 192.168.10.22: bytes=56 Sequence=10 ttl=255 time=39 ms
    Reply from 192.168.10.22: bytes=56 Sequence=11 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=12 ttl=255 time=57 ms
    Reply from 192.168.10.22: bytes=56 Sequence=13 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=14 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=15 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=16 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=17 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=18 ttl=255 time=2 ms
    Reply from 192.168.10.22: bytes=56 Sequence=19 ttl=255 time=1 ms
    Reply from 192.168.10.22: bytes=56 Sequence=20 ttl=255 time=2 ms

  --- 192.168.10.22 ping statistics ---
    20 packet(s) transmitted
    20 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 1/10/57 ms

<switch>ping -c 20 192.168.11.10
  PING 192.168.11.10: 56  data bytes, press CTRL_C to break
    Reply from 192.168.11.10: bytes=56 Sequence=1 ttl=255 time=4 ms
    Reply from 192.168.11.10: bytes=56 Sequence=2 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=3 ttl=255 time=44 ms
    Reply from 192.168.11.10: bytes=56 Sequence=4 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=5 ttl=255 time=57 ms
    Reply from 192.168.11.10: bytes=56 Sequence=6 ttl=255 time=3 ms
    Reply from 192.168.11.10: bytes=56 Sequence=7 ttl=255 time=4 ms
    Reply from 192.168.11.10: bytes=56 Sequence=8 ttl=255 time=4 ms
    Reply from 192.168.11.10: bytes=56 Sequence=9 ttl=255 time=3 ms
    Reply from 192.168.11.10: bytes=56 Sequence=10 ttl=255 time=3 ms
    Reply from 192.168.11.10: bytes=56 Sequence=11 ttl=255 time=3 ms
    Reply from 192.168.11.10: bytes=56 Sequence=12 ttl=255 time=2 ms
    Reply from 192.168.11.10: bytes=56 Sequence=13 ttl=255 time=2 ms
    Reply from 192.168.11.10: bytes=56 Sequence=14 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=15 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=16 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=17 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=18 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=19 ttl=255 time=1 ms
    Reply from 192.168.11.10: bytes=56 Sequence=20 ttl=255 time=1 ms
    [rousseau@localhost script]$ 

As you can see, it skips the 3rd ping (checked several times) and exited before the 4th ping summery. Can anyone please help fixing this? Thanks in advance.

Answer 1

You may be running into a timeout issue. Default timeout for Expect is 10 seconds. 20 pings will take more than that approx.

use the following command in the beginning of the script:

set timeout 60

to set it to 1 min.