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scionassociation / scion-dp_I-D

Specification of the SCION data plane
https://scionassociation.github.io/scion-dp_I-D/
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Added SCION IP Gateway section #46

Closed knmeynell closed 2 weeks ago

knmeynell commented 1 month ago

Basic description pulled from different sources. Do we need to describe the encapsulation/framing protocol in detail here? Is this section in the right place in the I-D?

Resolves #40

nicorusti commented 5 days ago

From: Harald Alvestrand harald@alvestrand.no Date: 7 September 2024 at 02:16:59 CEST To: Nicola Rustignoli nic@scion.org, Eliot Lear lear@lear.ch Cc: draft-dekater-scion-controlplane@ietf.org, Kevin Meynell kme@scion.org, Dominik Roos roos@anapaya.net Subject: Re: [RFC-Ed-Board] SCION - some initial thoughts



I still don't think you have enough info on the IP gateway.

In particular - does the IP gateway pair (entry + exit) act like a NAT box, matching the source address in the source domain to the gateway address in the destination domain, or is it an one-way tunnel of unchanged bits?

In both cases - where are the IP addresses (or equivalent) carried through the tunnel? As part of the SCION address (as the presence of those forms of address in the endpoint scheme seems to indicate), or as part of the packet?

And if the addresses are mapped, who takes care of the payload modifications that any NAT needs to do?

Harald