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Old 10-29-2014, 06:58 AM   #1
-Jiten-
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Question Query regarding ping command [Ubuntu]


I am typing below mentioned command :
ping -i 10 -s 128 192.168.0.103

Here we are defining (-i)interval, (-s)size of packet.
So this means it should sent & receive 128 bytes of data packet right ?

But instead of that am getting this:

PING 192.168.0.103 (192.168.0.103) 128(156) bytes of data.
136 bytes from 192.168.0.103: icmp_seq=1 ttl=128 time=0.643 ms
136 bytes from 192.168.0.103: icmp_seq=2 ttl=128 time=0.311 ms
136 bytes from 192.168.0.103: icmp_seq=3 ttl=128 time=0.324 ms


its is sending 136 bytes of data. Can you explain why ?
 
Old 10-29-2014, 07:04 AM   #2
pan64
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see man page of ping:
Code:
 -s packetsize
              Specifies the number of data bytes to be sent.  The default is 56, which translates into 64 ICMP data bytes when combined with the 8  bytes  of
              ICMP header data.
 
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Old 10-29-2014, 07:12 AM   #3
-Jiten-
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Question

Quote:
Originally Posted by pan64 View Post
see man page of ping:
Code:
 -s packetsize
              Specifies the number of data bytes to be sent.  The default is 56, which translates into 64 ICMP data bytes when combined with the 8  bytes  of
              ICMP header data.
So when we are sending 128 bytes of data. 8 bytes of header is added in it . So total amount of data will always be defined data + 8 bytes .. ryt ?
 
Old 10-29-2014, 07:19 AM   #4
eklavya
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Yes, 136 bytes if -s is 128
 
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