On 2011-06-29 01:12, Thomas Narten wrote: > Jari Arkko <jari.ar...@piuha.net> writes: > >> Bob, > >>>> In addition, I'm not sure I understand how a router knows that it >>>> is a first hop router. > > IMO, this is not necessarily intended to be something routers just > know automatically. The point is that routers closer to the source > tend to have better knowledge about how to set the Flow Label > properly. For example, access routers, which may already be screening > the port for invalid MAC src addrs, improper src IP addresses, > etc. Routers that do this would be well placed to do Flow Label > setting as well. > > That all said, any router that sees a Flow Label of zero, and wants to > change it to something better presumably should/can. When would that > NOT be the case?
If the network manager of the site decides not to do it there? I think it needs to be configurable. > >>>> Are there cases where a device might >>>> mistakenly believe it is a first hop router at a point where the >>>> traffic has already been load-balanced to multiple routers? Are >>>> there situations where the multiple first hop routers are used >>>> from the same host? > > Sure. But why should that impact how the Flow Label is rewritten from > zero to something else? Because different routers might pick different labels for packets that belong to the same flow. Brian > >>>> The document should provide some guidance about operational >>>> conditions where the recommendations for the first hop router can >>>> be applied. The document should state how such functionality is >>>> turned on (per configuration? automatically?) and provide >>>> assurances that problematic conditions can be avoided. > > What problematic conditions do we need to worry about here? -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
