Packet fragmentation

Packet fragmentation
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Subject Author Date
Packet fragmentation djoe 04-25-2006
Posted by djoe on April 25, 2006, 3:07 pm
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can one configure the ethernet interface of a router to do packet
fragementation?


Pure Networks
Posted by Arnold Nipper on April 25, 2006, 3:40 pm
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On 25.04.2006 21:07 djoe wrote

> can one configure the ethernet interface of a router to do packet
> fragementation?
>

A router will always do fragmentation *unless* the sender hat set the DF
(don't fragment) bit.

--
Arnold Nipper, AN45

Posted by Steinar Haug on April 25, 2006, 4:29 pm
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> A router will always do fragmentation *unless* the sender hat set the
> DF (don't fragment) bit.

Depends on how you define router. There are plenty of "L3 switches" and
similar boxes that will forward packets based on IP address, but won't
perform fragmentation.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

Posted by Arnold Nipper on April 25, 2006, 6:17 pm
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On 25.04.2006 22:29 Steinar Haug wrote

>> A router will always do fragmentation *unless* the sender hat set the
>> DF (don't fragment) bit.
>
> Depends on how you define router. There are plenty of "L3 switches" and
> similar boxes that will forward packets based on IP address, but won't
> perform fragmentation.
>

See RFC 1812 4.2.2.7 ... "Fragmentation, as described in [INTERNET:1],
MUST be supported by a router."


--
Arnold Nipper, AN45

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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
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International Telecommunication Union

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