kre;
> | Your assumption that source address of a incoming packet is reachable is
> | improper.
>
> The source is more likely reachable than some DNS server at some unknown
> location
There are multiple DNS servers. Moreover, you must, anyway, rely on
DNS for forward lookup.
> - at least we know the source address is actually alive and connected
> at the time.
Source host is, source address of the host may not.
> Personally, I have lost essentially all faith in the usefulness of addr->name
> translations at all, and wouldn't mind simply saying "cannot be done" (in
> general of course, it might sometimes work, just don't depend upon it). But
> if it must be done, the node info query way is good enough.
The primary benefit of having a reverse tree is that the tree makes
address assignement unique.
> | Never assume routing symmetric.
>
> What does that have to do with anything?
v6 people including itojun persistently assume it, for example, for
such topics as a source address selection.
Masataka Ohta
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