Gabi Nakibly wrote:
> I certainly agree that the benefit of the simplicity of this rule is 
> very desirable. However, this rule may be too restrictive. I am worried 
> that there might be cases where it is desirable to send a packet to a 
> (on-link) global address using a link-local address or ULA. Straight off 
> the top of my head, I can think of a solicited RA. This message must 
> use as a source address the router's link-local address and as a 
> destination address the address of the node that sent the RS, that may 
> very well be global.

In that particular case, the source address selection algorithm isn't 
applicable.  There are a number of such cases where RFCs specify a 
specific source address to use for specific packets (echo replies are 
another example), and where source address selection doesn't occur.  Your 
general concern is valid, though.

-Seb
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