Folks,
Thanks for writing this document.
A few quick questions:
1.
In Section 3.2, bullet 1, you say, "The underlay head-end node constructs an
ICMP error message destined for the overlay endpoint." Can I assume that a) the
source address is that of the head-end node, b) the ICMP message type is copied
from the incoming ICMP message and c) the ICMP code is copied from the incoming
ICMP message?
2.
If the type is copied from the incoming ICMP message, what does the head-end do
when it receives a non-extensible ICMP message from the underlay (e.g., packet
too big)?
3.
When the head-end receives an ICMP message, how does it determine whether the
message is for its own consumption or for consumption by another node in the
overlay.
4.
Do you think that you might need to update RFC 4443, Section 4.2, Rule e.1?
Ron
________________________________
From: Madhan Sankaranarayanan (madsanka) <[email protected]>
Sent: Tuesday, October 14, 2025 3:30 PM
To: [email protected] <[email protected]>
Cc: Jaganbabu Rajamanickam (jrajaman) <[email protected]>; Darren Dukes
(ddukes) <[email protected]>
Subject: [Int-area] [INTAREA] Call for Review: New Internet-Draft on ICMP
extension for underlay info (-03)
[External Email. Be cautious of content]
Dear Internet Area Working Group,
We are pleased to announce the publication of a new version of our
Internet-Draft and would appreciate your review and comments.
Draft Name: draft-jags-intarea-icmp-ext-underlay-info-03
Title: ICMP extension to include underlay information
Abstract:
Network operators managing overlay networks require visibility into
underlay network hops during traceroute operations from overlay
endpoints. This document defines an ICMP extension object, the
Underlay Information Object (UIO), which allows underlay head-end
nodes to encapsulate underlay error information within ICMP error
messages. This mechanism provides overlay operators with crucial
visibility into underlay network paths for troubleshooting.
You can find the draft here:
https://datatracker.ietf.org/doc/draft-jags-intarea-icmp-ext-underlay-info/<https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-jags-intarea-icmp-ext-underlay-info/__;!!NEt6yMaO-gk!B8mYO_yOVgsyIjMavyTdZ6MfwJ-Pn9IraWhbJi24ZHspUa3mvDSXgD5IV1faj-i91UvVTihFdeV4BL7IW6wweOO2Le-uO6s$>
We welcome all feedback and comments on this document.
Thanks,
Madhan
Juniper Business Use Only
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