Phil Pennock, 2011-11-03 04:31:

> I would be very interested in knowing of such a thing.  One of the items
> already on my "work on Exim at some point" list of features is:
> 
> Item:
>   disk stable format write-infrequent read-often (a la CDB) binary trie 
> storage
>   designed to be useful for IP lookups against tables (PF style) to avoid 
> walking lists.

I did not look much for it, but a quick search turned up some C libs for
that.
I guess this is something nice to have, but I would not expect much from
it. We usually don't have to look up thousands or millions of IP
addresses like a router or firewall has to.

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