On Mon, 12 Jan 1998, Daniel Ryde wrote:
> At which point is it more effective to use dbm instead of linear search?
Very hard to say. It must depend on your system and DBM library.
> How efficient is the handling when doing two lookups in the same "run",
> like in virtual hosts (does it open the file and reread it twize?):
Exim does do some caching by holding files open and remembering the last
thing it looked up. If you run it with -d9 you will see comments about
caching in the debug output.
> I have another problem in a virtual host enviroment. Usually we setup a
> A mail.domain.se that also works as MX domain.se. But if some user
> mail to foo@???, it freezes becouse it points back to a local
> IP address (we usually have www, ftp and hub to the same IP aswell).
> Ahem... How do I prevent that using the best possible way :)
> They do point to the machine, but I don't want them there.
> Some kind of configurable rejector... But it should only match
> domains that still "points back to me".
I don't really understand your situation, sorry. Could you give an
example of the DNS records? Have you looked at the "self" generic option
for routers?
--
Philip Hazel University Computing Service,
ph10@??? New Museums Site, Cambridge CB2 3QG,
P.Hazel@??? England. Phone: +44 1223 334714
--
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