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Re: [Ila] [5gangip] PS draft: New Version Notification for draft-hspab-5gangip-atticps-00.txt

Tom Herbert <tom@herbertland.com> Thu, 01 February 2018 15:52 UTC

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From: Tom Herbert <tom@herbertland.com>
Date: Thu, 01 Feb 2018 07:51:43 -0800
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To: Dino Farinacci <farinacci@gmail.com>
Cc: Tom Herbert <tom@quantonium.net>, 5GANGIP <5gangip@ietf.org>, Behcet Sarikaya <sarikaya@ieee.org>, ila@ietf.org
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Subject: Re: [Ila] [5gangip] PS draft: New Version Notification for draft-hspab-5gangip-atticps-00.txt
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On Wed, Jan 31, 2018 at 5:32 PM, Dino Farinacci <farinacci@gmail.com> wrote:

> What if you and I are running ILA and are attached to different providers.
> How do you get packets to me if my locators are not exposed outside my
> provider?
>
> Dino,

Here's what the path looks like

Host_1 - Internet - ILA-R - Network - ILA-N - Host_2

When Host_1 sends to Host_2 the packet is addressed to Host_2's SIR address
(externally visible addressed). The packet is routed without modification
over Internet to an ingress router (ILA-R). This router transforms the
destination with locator for Host_2 which is the rotatable prefix
associated with ILA-N. Packet is forwarded over the network. At ILA-N, the
ILA transformation is reversed so that SIR address is again the
destination.  Packet is then delivered to Host_2.

The reverse path looks the same where ILA transformation is performed by
Host_1's provider.

The path is equivalent to use of encapsulation to provide the network
overlay where ILA-R is replaced by encapsulator and ILA-N is a decapitator.

Tom

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