Re: (v6ops) WG Last Call: draft-ietf-v6ops-renumbering-procedure-00.txt (fwd)

[Iljitsch van Beijnum <iljitsch@muada.com>]

On 7-jul-04, at 22:39, Fred Baker wrote:

>    When a company changes providers, it is common to institute an
>    overlap period, during which it is served by both providers.  By
>    definition, the network is multihomed during such a period.  While
>    this document is not about multihoming per se, problems can arise as
>    a result of ingress filtering policies applied by the upstream
>    provider or one of its upstream providers, so the user of this
>    document need also be cognizant of these issues.  This is discussed
>    in detail, and approaches to dealing with it are described, in
>    [RFC2827] and [RFC3704].

These references outline ingress filtering, but there is only about 
half a page in the second one about how to route traffic with certain 
addresses to a certain provider, and this half page provides very 
little actual guidance.

A few paragraphs along the lines of "ask one ISP to temporarily accept 
packets with the other's addresses and use that one for outgoing 
traffic or use policy routing to match ISPs to the source addresses in 
outgoing packets, or if these approaches aren't possible, implement a 
flag-day type of transition" would be very helpful, I think.