Re: IPv6 over IPv4 using GRE tunelling

Dear Mr.Mat,
  Your answer is very correct. Sorry for my previous mail yesterday where i
said you are wrong.
I am very thankful to you for your help.

regards
Radhakrishnan


----- Original Message -----
From: "Mat Ford" <[email protected]>
To: "S.Radhakrishnan" <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, April 22, 2003 14:09
Subject: RE: (ngtrans) 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
>