Hi Juan Carlos,
Final passage of Section 3.1 says:
“However, in an alternative configuration, the GRE ingress MAY:
o discard the IPv6 packet
o send an ICMPv6 Packet Too Big (PTB) [RFC4443] message to the IPv6
packet source. The MTU field in the ICMPv6 PTB message is set to
the GMTU.”
This means that there may be circumstances when the GRE ingress sends
a PTB reporting a size less than 1280. According to RFC2460, Section 5, the
standard behavior for a host that receives such a PTB is:
“In that case, the IPv6 node
is not required to reduce the size of subsequent packets to less than
1280, but must include a Fragment header in those packets”
So, hosts that obey RFC2460 Section 5 will see a perpetual black hole if the
GMTU is smaller than 1280 which is probably not what we want.
‘draft-templin-6man-linkadapt’ attempts to provide guidance to hosts on
how to react to PTB messages that report a small size. But, as of right now,
RFC2460 Section 5 is the normative behavior.
Thanks – Fred
[email protected]
From: Int-area [mailto:[email protected]] On Behalf Of Zuniga, Juan
Carlos
Sent: Monday, March 30, 2015 1:27 PM
To: [email protected]; [email protected]
Cc: [email protected]; [email protected]
Subject: [Int-area] Start of WGLC for draft-ietf-intarea-gre-ipv6
Dear Int-Area and 6man WGs,
At the Int-Area WG meeting in Dallas there were some comments on
draft-ietf-intarea-gre-ipv6. It was decided to submit the document for WG Last
Call to the Int-Area & 6man WGs as soon as the agreed changes were made.
The document has now been updated accordingly, so this email starts an
Int-Area/6man WGs Last Call on:
http://tools.ietf.org/html/draft-ietf-intarea-gre-ipv6-04
Please respond to this email to support the document and/or send comments by
2015-04-06.
In addition, to satisfy RFC 6702 "Promoting Compliance with Intellectual
Property Rights (IPR)":
Are you personally aware of any IPR that applies to draft-ietf-intarea-gre-ipv6?
If so, has this IPR been disclosed in compliance with IETF IPR rules?
(See RFCs 3979, 4879, 3669, and 5378 for more details.)
Best,
Juan Carlos Zuniga
(as Int-Area WG co-chair)
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