> So the question is: am I correct to regard this scenario as 
 > broken and 
 > say it should not be encouraged? 

=> Apparently, yes. We had this discussion in nemo some time 
ago. It's unfortunate that this situation is not made clear
in the current specs.


   I also think that nobody 
 > plans to build 
 > fixed networks like this, just for these reasons. However, 
 > people may 
 > want to build NEMO-type of networks just like this, as it is 
 > convenient 
 > when mobile routers are rather independent, they come and 
 > go, and each 
 > connects to one ISP and each only advertises a prefix from its ISP. 

=> Even if they connect to the same ISP, each MR is likely
to advertise a different home prefix.

 > Awkwardly, then it is more important than ever that the 
 > mobile routers 
 > are cooperating otherwise legacy IPv6 hosts won't be able to 
 > get plain 
 > connectivity.

=> It might be better to require the MRs to be aware
of each others' existence and forward traffic with
Pa as a src to Ra and vice versa.

Hesham
 > 
 > /Mattias
 > 
 > 
 > 
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