nscd, caching-nameserver and ssh

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I have some questions about caching nameservers.

My home PC is on dhcp that changes IP address every 12 hours. I also
have registered at no-ip.org, so that I can connect from the PC at work
using a named address. However nscd does not update its cache. I have
set "positive-time-to-live" to "3600", but that doesn't seem to have any
effect. I also set "persistent" to "no", so that restarting nscd DOES
get the changed IP address.

What is the difference of having caching-nameserver installed with named
running and having nscd running in addition?

There is also a problem with ssh, if nscd is off, but named running,
logging in via ssh from my home PC to my work PC takes a long time (I
presume, this is because of reverse DNS lookup). With nscd on, it is
immediate. Has the caching-nameserver no effect at all?

Regards
-- 
Gérard Milmeister
Langackerstrasse 49
CH-8057 Zürich


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