RE: IPv6 over IPv4 using GRE tunelling

The ethertype for IPv6 is 0x86DD. Your example is incorrect - the ethertype
for IPv4 is 0x0800.

Mat

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of S.Radhakrishnan
Sent: 22 April 2003 05:50
To: [email protected]
Subject: (ngtrans) IPv6 over IPv4 using GRE tunelling


Hi,
      I am presently working on IPv6 transition project. I am have
doubt on IPv6-over-IPv4 using GRE tuneling  mechanism.
The following is a block diagram for IP as delivery protocol for
a GRE packet which as an IPv4 packet as payload.

|---------------------------------------------------------------------------
----------|
|IPv4 Header   |  GRE header    |   IPv4 packet as Payload   |
|Protocol field |   Protocol         |
|
|value = 47     |  type = 0x8000 |                                        |
|---------------------------------------------------------------------------
----------|

I would like to know as what value the protocol type in GRE header
should have to carry IPv6 packet as payload with IPv4 as the
delivery protocol for the GRE packet?

|---------------------------------------------------------------------------
----------|
|IPv4 Header   |  GRE header    |   IPv6 packet as Payload   |
|Protocol field |   Protocol         |
|
|value = 47     |  type = XXXX     |
|
|---------------------------------------------------------------------------
----------|


I will be very grateful if someone can help me by answering my query.

Thanking you
Radhakrishnan