Re: failure detection

[marcelo bagnulo braun <marcelo@it.uc3m.es>]

El 29/08/2005, a las 23:54, Paul Jakma escribió:

> The other possibility for SOHO:
>
>
>      host
>       |
>  -----------
>    |     |
>  SOHO1  SOHO2
>    |     |
>  ISP1   ISP2
>
> In which case the /host/ must pick which router to send to. In which 
> case everything is under its control - shim6 can easily leave source 
> unspecified. IP output then does SAS using routing information as 
> normal, picks a prefix and uses a source route to send it to the right 
> SOHO router.

In this case, i guess you are considering that the host will choose the 
source address containing prefix Pref1 when sending packets with next 
hop router Soho1, right? would this be the case of available 
implementations?

> So, I think for the former case (one SOHO router), the router almost 
> certainly will have to support source-prefix routing to be a viable 
> consumer product. The shim6 layer can use unspecified address, 
> regardless which prefix the underlying IP layer chooses (hopefully 
> using RA information, which hopefully the SOHO router is good enough 
> to update according to state of links to ISPs), the SOHO router will 
> send it to right ISP.
>
> In the latter case, its under the hosts control, and again the 
> underlying IP SAS will do the right thing if shim6 leaves the address 
> unspecified.


How would you deal with the following situation:

     host
      |
  ----------
      |
    router3
      |
 -----------
   |     |
 SOHO1  SOHO2
   |     |
 ISP1   ISP2

In this case, router3 is internal to the SOHO site and it is announcing 
both prefixes.