Re: [alto] FW: I-D Action:draft-stiemerling-alto-deployments-05.txt

[Martin Stiemerling <[e-mail]>]

Hi Christian, 

You are raising a good point, which is not covered by the deployments draft.

Mobile peers will also challenge the map-based approach, unless the preference information always indicates to turn away from these types of peers. This could be the most likely case, i.e., the ISP will configure to rank those mobile peers really bad, so that other peers will not pick them. 

The challenge is in the case where there is more specific configuration needed. For instance, static mobile peers (e.g., UMTS stick in home gateway), might get a slightly better rating, as well as, mobile peers on HDSPA.

However, the rating for such a mobile peer may change rapidly, if the peer starts moving and even changes the access technology (e.g. HSDPA to EDGE). The IP address of the peer will remain the same but the rating will dramatically change. 

I guess this is hard to manage with the map-based approaches. 

Thanks and Cheers to Munich

  Martin


> -----Original Message-----
> From: Schmidt, Christian 1. (NSN - DE/Munich)
> [mailto:[e-mail]]
> Sent: Friday, October 29, 2010 9:18 AM
> To: Martin Stiemerling; [e-mail]
> Subject: RE: [alto] FW: I-D Action:draft-stiemerling-alto-deployments-
> 05.txt
> 
> Hi Martin,
> 
> a short question concerning the map-based approach:
> 
> "The main assumption for map-based approaches is that the information
> provided in these maps is static for a longer period of time, where
> this
> period of time refers to days, but not hours or even minutes. This
> assumption is fine, as long as the network operator does not change any
> parameter, e.g., routing within the network and to the upstream peers,
> IP address assignment stays stable (and thus the mapping to the
> partitions).  However, there are several cases where this assumption is
> not valid, as:
>    1.  ISPs reallocate IPv4 subnets from time to time;
>    2.  ISPs reallocate IPv4 subnets on short notice;
>    3.  IP prefix blocks may be assigned to a single DSLAM which serves
> a
> variety of access networks."
> 
> What about mobile peers? How do they fit into a map-based approach?
> 
> Christian
> 
> 
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] On Behalf Of
> ext Martin Stiemerling
> Sent: Friday, October 29, 2010 8:37 AM
> To: [e-mail]
> Subject: [alto] FW: I-D Action:draft-stiemerling-alto-deployments-
> 05.txt
> 
> Dear all,
> 
> There is a slightly updated version of the deployment considerations
> draft.
> 
> Rich Alimi, Richard Yang, Xianghui Sun, Sebastian and me will come up
> with a joint proposal how to evolve the document at the next IETF.
> 
> Any comments are appreciated!
> 
>   Martin
> 


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