Re: JUMBO FRAMES

You would still be wrong, as retransmission as such would be only
those performed by the control protocol, i.e. TCP in this case. What
applications do is application behavior, not network control.

Then again, that's being picky.

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Marko Milivojevic - CCIE #18427
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On Wed, Jun 8, 2011 at 15:17, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:
> Sure,
> I was just not ok with calling "retransmissions" only those packets
> recognized as such by tcpdump.
>
> I've learned to be picky with the nomenclature of things, my bad.
> -Carlos
>
> Marko Milivojevic @ 08/06/2011 18:09 -0300 dixit:
>>
>> Those retransmissions are implemented on the application layer and may
>> not be seen as such unless you were specifically looking for them. On
>> the other hand, TCP retransmissions will be immediately identified as
>> such. Have you ever used tcpdump?
>>
>> --
>> Marko Milivojevic - CCIE #18427
>> Senior Technical Instructor - IPexpert
>>
>> FREE CCIE training: http://bit.ly/vLecture
>>
>> Mailto: markom_at_ipexpert.com
>> Telephone: +1.810.326.1444
>> Web: http://www.ipexpert.com/
>>
>> On Wed, Jun 8, 2011 at 13:19, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:
>>>
>>> Why is that you won't see retransmissions if it is not TCP ?
>>> Try SIP over UDP, you will see retransmissions.
>>> NFS over UDP ? Same thing.
>>> Just because TCP is not in charge of them does not mean they will not
>>> take
>>> place :)
>>> -Carlos
>>>
>>> Marko Milivojevic @ 8/6/2011 15:34 -0300 dixit:
>>>>
>>>> Is the application TCP? If it isn't, you won't see the retransmissions.
>>>>
>>>> And yeah - traffic is very likely being dropped by the switch, but
>>>> lacking any command output, it's hard to say for sure :-)
>>>>
>>>> --
>>>> Marko Milivojevic - CCIE #18427
>>>> Senior Technical Instructor - IPexpert
>>>>
>>>> FREE CCIE training: http://bit.ly/vLecture
>>>>
>>>> Mailto: markom_at_ipexpert.com
>>>> Telephone: +1.810.326.1444
>>>> Web: http://www.ipexpert.com/
>>>>
>>>> On Wed, Jun 8, 2011 at 08:32, Bernard Steven <buny.steven_at_gmail.com>
>>>> wrote:
>>>>>
>>>>> What will happen if a server sends a jumbo frame to the connected
>>>>> switch
>>>>> that does not support (not configured) Jumbo frames ?
>>>>>
>>>>> My problem is when i capture traffic from server IF (tcpdump ) , i see
>>>>> large
>>>>> frames (1518<) , in the mean time , switch is not configured for JF and
>>>>> also
>>>>> i don't see any retransmissions in tcpdump. (assuming switch discards
>>>>> the
>>>>> jumbo frame). And also i dont have any visibility on the other end of
>>>>> the
>>>>> communication. Some how , application does not work.Switch is a 4948.
>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>> --
>>> Carlos G Mendioroz B <tron_at_huapi.ba.ar> B LW7 EQI B Argentina
>>>
>
> --
> Carlos G Mendioroz B <tron_at_huapi.ba.ar> B LW7 EQI B Argentina
Blogs and organic groups at http://www.ccie.net