Question about IP-in-IP tunneling

A question for the IP tunneling experts:

For IP-in-IP tunneling, what are the cases when IPROTO_IPIP (4) is used in the protocol field of the outer IP header and the cases when IPPROTO_IPV6 (41) is used instead?

thanks,
--santwona

Assuming the outer IP header is a IPv4 header, the protocol field of this IPv4 header has IPROTO_IPIP (4) when the inner header is IPv4 and IPPROTO_IPV6 (41) when the inner header is IPv6

Is that what you asked?

- Srivats

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Friday, February 27, 2009 2:37 AM
To: [email protected]
Subject: Question about IP-in-IP tunneling

A question for the IP tunneling experts:

For IP-in-IP tunneling, what are the cases when IPROTO_IPIP (4) is used in the protocol field of the outer IP header and the cases when IPPROTO_IPV6 (41) is used instead?

thanks,
--santwona
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That does answer my question, thank you. Extending this to IPv6 as the outer header, is the next header field IPROTO_IPIP for IPv4 inner header and IPPROTO_IPV6 for IPv6 inner header?

thanks!
--santwona