Bruce M. Simpson wrote:
Wouldn't it make sense to treat each alias as on a separate
logical interface? Then each logical interface belongs to
exactly one FIB. On input you decide which logical inteface
a packet arrived on by looking at its destination MAC
address. That reduces confusion quite a bit, at least in my
mind! What does doing more than this buy you?
It doesn't buy anything because there is still no 1:1 mapping -- the
link-layer destination address maps to an ifp, and multiple aliases
exist on the ifp.
Let me qualify that further: You are talking about splitting network
layer addresses onto their own logical interfaces, with the goal of
having a 1:1 mapping for FIB resolution.
This doesn't buy anything, because in IP, the previous hop never encodes
the next-hop address it sends to -- it merely performs a lookup and
forwards to you; your MAC address is the same for every IP address you
have on the link, therefore it is not a unique identifier.
UNLESS you use a separate MAC address for every IP alias which you add,
in which case, you are merely pushing the mapping elsewhere in the
stack; it actually adds more complexity in this case.
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