Re: Echo request and echo reply

Hmm,
The question was specific to 8.8.8.8, which is a specific host (or set
of hosts :) that actually DO NOT behave like RFC-792 asks.

FTR, RFC-792 says:

   Data received in an ICMP Echo Request MUST be entirely included in the
   resulting Echo Reply. However, if sending the Echo Reply requires
   intentional fragmentation that is not implemented, the datagram MUST
   be truncated to maximum transmission size (see Section 3.3.3) and
   sent.
...

   If a Record Route and/or Time Stamp option is received in an ICMP Echo
   Request, this option (these options) SHOULD be updated to include the
   current host and included in the IP header of the Echo Reply message,
   without "truncation". Thus, the recorded route will be for the entire
   round trip.

but testing shows that 8.8.8.8 answers with small reply when data size
gets over 64 bytes.

-Carlos

Piotr Matusiak @ 01/11/2011 10:00 -0300 dixit:
> Yes
>
> Regards,
> --
> Piotr Matusiak
> CCIE #19860 (R&S, Security), CCSI #33705
> Technical Instructor
> website: www.MicronicsTraining.com <http://www.micronicstraining.com/>
> blog: www.ccie1.com
>
> If you can't explain it simply, you don't understand it well enough -
> Albert Einstein
>
>
> 2011/11/1 amin <amin_at_axizo.com>
>
>> Hi experts,
>>
>>
>>
>> If I do extended ping 8.8.8.8 size 2000, this is the size of the echo
>> request, what will be the size of the echo replay? It will be the same
>> size??
>>
>>
>>
>> Regards,
>>
>> Amin
>>
>>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net