Close Encounters of the ICMP Type 2 Kind (Near Misses with ICMPv6 Packet Too Big (PTB)) (RFC7690)
Original Publication Date: 2016-Jan-01
Included in the Prior Art Database: 2016-Feb-06
Internet Society Requests For Comment (RFCs)
M. Byerly: AUTHOR [+3]
Operators of popular Internet services face complex challenges associated with scaling their infrastructure. One scaling approach is to utilize equal-cost multipath (ECMP) routing to perform stateless distribution of incoming TCP or UDP sessions to multiple servers or to middle boxes such as load balancers. Distribution of traffic in this manner presents a problem when dealing with ICMP signaling. Specifically, an ICMP error is not guaranteed to hash via ECMP to the same destination as its corresponding TCP or UDP session. A case where this is particularly problematic operationally is path MTU discovery (PMTUD) [RFC1981].
Internet Engineering Task Force (IETF) M. Byerly Request for Comments: 7690 Fastly Category: Informational M. Hite ISSN: 2070-1721 Evernote J. Jaeggli Fastly January 2016
Close Encounters of the ICMP Type 2 Kind (Near Misses with ICMPv6 Packet Too Big (PTB))
This document calls attention to the problem of delivering ICMPv6 type 2 "Packet Too Big" (PTB) messages to the intended destination (typically the server) in ECMP load-balanced or anycast network architectures. It discusses operational mitigations that can be employed to address this class of failures.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7690.
Byerly, et al. Informational [Page 1]
RFC 7690 Misses with ICMPv6 PTB January 2016
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