[SOLVED] Query regarding ping command [Ubuntu]

-Jiten- · 10-29-2014, 05:58 AM

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 ?

pan64 · 10-29-2014, 06:04 AM

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.

-Jiten- · 10-29-2014, 06:12 AM

Quote:

Originally Posted by pan64

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 ?

eklavya · 10-29-2014, 06:19 AM

Yes, 136 bytes if -s is 128