Re: [spring] Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming

[Stefano Salsano <[e-mail]>]

Fernando,

Il 2020-02-27 12:11, Fernando Gont ha scritto:

[... removed non-technical discussion]

> One of their last inventions has been to pretend that IPv6 allows EH 
> insertion/deletion en-route, based on their reading of RFC8200. Based on 
> a curious interpretation of the text, they claim that each waypoint 
> (intermmediate router that received the packet because its address was 
> set as de Destination Address) can insert/remove EHs, and they claim 
> that that's not a violation of RFC8200.
> 
> However, the PSP behavour doesn't even fit in that fictional 
> interpretation of RFC8200.
> 
> What PSP does is that, given:
> 
>   ---- B ----- C
> 
> routers, when B realizes, after processing the SRH and setting the Dest 
> Addr to the last segment, SegmentsLeft==0, it removes the SRH.
> 
> This case is not even covered by their fictional interpretation of RFC8200.

router B receives a packet whose DA belongs to B

in the pseudo code router B sets the DA of the packet to C before 
removing the SRH, this is only the description of the internal 
processing that happens in the router

this does *NOT* mean that router B can remove an SRH in a received 
packet in which the DA belongs to C

Stefano

[... removed non-technical discussion]



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Stefano Salsano
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Dipartimento Ingegneria Elettronica
Universita' di Roma Tor Vergata
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