Length field in 802.3  for tagged frames

Length field in 802.3 for tagged frames

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Subject Author Date
Length field in 802.3 for tagged frames binosh 11-24-2006
Posted by binosh on November 24, 2006, 4:02 am
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Hi all,

For tagged ethernet packets, does the length field in 802.3 header
include the length of VLAN tag(s) also ???


Thanks in advance
Best Regards
Binosh


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Posted by Justa Lurker on November 24, 2006, 10:58 am
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binosh wrote:
> Hi all,
>
> For tagged ethernet packets, does the length field in 802.3 header
> include the length of VLAN tag(s) also ???
>
>
> Thanks in advance
> Best Regards
> Binosh
>

'Tis the season for takehome tests, falalalala, lalalala

Binosh, what do you think the answer is ? What references have you
consulted already ? Once we know that, then maybe folks here can help
you better.


Posted by binosh on November 25, 2006, 12:36 pm
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Hi boss,

I guess the answer is the length field doesn't include the VLAN header
length. But in some code, where they are adding a VLAN tag to an
untagged packet I saw that after adding the VLAN tag they are
incrementing the length field value also. Thats why i got confused.The
IEEE 802.3 says only about untagged packets. And in 802.1Q I couldn't
find anything answering my doubts.

Please help me yaar

Thanks in advance

Justa Lurker wrote:
> binosh wrote:
> > Hi all,
> >
> > For tagged ethernet packets, does the length field in 802.3 header
> > include the length of VLAN tag(s) also ???
> >
> >
> > Thanks in advance
> > Best Regards
> > Binosh
> >
>
> 'Tis the season for takehome tests, falalalala, lalalala
>
> Binosh, what do you think the answer is ? What references have you
> consulted already ? Once we know that, then maybe folks here can help
> you better.


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