Re: Ether Type and Protocol Type

Hi Abraham Thank u for the link.

One question is when there are two tags in Q in Q, What will be the TPID
for the outer tag and inner tag

I guess the outer TAG has a tag protocol identifier of 9100 and the inner
vlan TAG has TPID of 8100 .

So i am not very sure that this may be true.

i guess 8100 is used for a single tag and 9100 is used for Q in Q tag :)

So the outer tag has TPID of 9100 and inner tag has TPDI of 8100

On Thu, Dec 29, 2011 at 12:08 PM, Abraham, Tharak
<tharakabraham_at_gmail.com>wrote:

> The value of TPID for Q in Q depends on the stack implementation from
> different vendors
> For Eg: Alcatel and Juniper uses 0x9100 and Cisco uses 0x8100
>
> In the case of IP in IP the Protocol number would be 4, which denotes IPv4
>
> http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml
>
> You may have to g00gle for more details and for other specific info.
>
> Best Regards,
> Tharak Abraham Luke
>
>
> On Wed, Dec 28, 2011 at 10:25 PM, Routing Freak <routingfreak_at_gmail.com
> >wrote:
>
> > Hi all
> >
> > When will u find the ether type as Dot 1Q (0x8100) and Q in Q (0x9100)
> >
> > Wat s the protocol field in IP header when the payload it carries is also
> > another IP header ( in case of IP in IP tunnel).
> >
> > Can anyone send me a link for different values of protocol types ?
> >
> >
> >
> >
> > On Tue, Dec 27, 2011 at 3:16 AM, Jochen Bartl <jochen.bartl_at_gmail.com
> > >wrote:
> >
> > > Hi,
> > >
> > > my preferred way for getting answers to those questions is watching
> > > frames/packets in Wireshark. If the Wireshark code of a particular
> > > protocol is not broken, it is a very convenient way to find out about
> > > the truth ;-)
> > > Sample capture files for the protocols you have mentioned are
> > > available on the following sites:
> > >
> > > http://packetlife.net/captures/ (Direct links to CloudShark)
> > > - Example:
> > >
> >
> http://www.cloudshark.org/view?url=http://packetlife.net/captures/802.1Q_tunneling.cap
> > > * Ethernet(eth-type 0x8100)/802.1q (TPID 0x8100)/802.1q (TPID
> > > 0x8000)/IPv4 (proto 1)/ICMP
> > > http://wiki.wireshark.org/SampleCaptureshttp://pcapr.net/
> > >
> > > Best regards,
> > >
> > > Jochen
> >
> >
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