Hi, Suresh Krishnan
Thank you for propose the problem.
I have checked the RFC[5844]. It did mention two kinds of UDP
Encapsulation Modes, IPv4-UDP and IPv4-UDP-TLV.
However, in the Section 4 "IPv4 Transport Support", it said:
* IPv4-UDP-TLV (payload packet carried in an IPv4 packet with UDP
and TLV header) and IPv4-GRE (Payload packet carried in an IPv4
packet with GRE header). Refer to [GREKEY]. If payload
protection using IPsec is enabled, the ESP header follows the
outer IPv4 header, as explained in Section 4.3.
So, the IPv4-UDP-TLV is actually defined in [GREKEY], i.e. RFC [5845]
named
Generic Routing Encapsulation (GRE) Key Option for Proxy Mobile IPv6
In RFC [5845], Figure 5 shows the "TLV-Header UDP-Based Encapsulation
Header Order",
[IPv4 Header]
[UDP Header]
[TLV Header]
[GRE Header]
[Payload - IPv6 or IPv4 Header]
Upper Layer protocols
Figure 5: TLV-Header UDP-Based Encapsulation Header Order
Hence, in my understanding, Tunnel-Type is 4 means the IPv4-UDP
Encapsulation Mode, not the IPv4-UDP-TLV Encapsulation Mode.
To resolve the problem, I can update the draft if no objections.
Old:
4: PMIPv6-UDP. This refers to the UDP tunneling encapsulation
described in [RFC5844].
New:
4: PMIPv6-UDP. This refers to the IPv4-UDP tunneling encapsulation
described in [RFC5844].
If any future problems, please connect me. Thanks.
Best Regards
Zongpeng Du
-----Original Message-----
From: Suresh Krishnan [mailto:[email protected]]
Sent: Wednesday, January 24, 2018 10:53 PM
To: The IESG <[email protected]>
Cc: [email protected]; Tianran Zhou
<[email protected]>; [email protected]; [email protected]; Tianran
Zhou <[email protected]>; [email protected]
Subject: Suresh Krishnan's Discuss on draft-ietf-opsawg-capwap-alt-tunnel-11:
(with DISCUSS)
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draft-ietf-opsawg-capwap-alt-tunnel-11: Discuss
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------
* Section 3.2.
This should be easy to resolve but I would like this to be disambiguated before
publication. RFC5844 specifies *two* different options for UDP encapsulation
IPv4-UDP and IPv4-UDP-TLV. Please clarify which of these modes is intended when
the Tunnel-Type is 4
4: PMIPv6-UDP. This refers to the UDP tunneling encapsulation
described in [RFC5844].
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