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RE: SRH insertion vs SRH insertion + encapsulation

Ron Bonica <rbonica@juniper.net> Sat, 07 September 2019 22:53 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>, Mark Smith <markzzzsmith@gmail.com>
CC: draft-voyer-6man-extension-header-insertion <draft-voyer-6man-extension-header-insertion@ietf.org>, "6man@ietf.org" <6man@ietf.org>
Subject: RE: SRH insertion vs SRH insertion + encapsulation
Thread-Topic: SRH insertion vs SRH insertion + encapsulation
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Date: Sat, 07 Sep 2019 22:52:54 +0000
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Folks,

IMHO, EH insertion modifies the semantics of the IPv6 source address. Today, the IPv6 source address indicates the source of an IP packet and *ALL* of its contents. If transit routers are allowed to insert extension headers, downstream routers can no longer identify the source of a packet and all of its contents.

Granted, in some cases, transit routers are allowed to modify a packet (e.g., Hop Count, DHCP, mutable options). But there is a big difference between changing a field whose value is know to me mutable and inserting a new option.

                                                                                                                                      Ron



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