Re: [Exim] I don't understand why routers and directors?

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Autor: Philip Hazel
Datum:  
To: Dan Kappus
CC: exim-users
Neue Treads: Re: [Exim] I don't understand why routers and directors?
Betreff: Re: [Exim] I don't understand why routers and directors?
On Tue, 13 Jun 2000, Dan Kappus wrote:

> What's the difference, really? Is there a reason for there to be two different
> categories? I'm a bit stuck on this part in my reading of the spec. Can
> someone clarify the why here?


History, and lack of foresight on my part. Smail 3 has routers and
directors; I copied the style. In the beginning they were very different
(directors could direct only to local transports; routers only to remote
ones; the set of "generic" options was different, etc). Evolution has
brought them much closer together; I say in my course (and have said in
a previous thread, and will say in the book) that one day the difference
between them might be abolished. This will simplify things (code and
documentation) a lot. I wish I'd thought of it at the start. However, it
will need some careful planning. The concept of local_domains is still
important for other things (relay checking, routing to "self") and so
must somehow be preserved.

If this ever happens, it won't be for some time. Also, I would probably
do some tidying/merging of existing routers/directors.

-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.