nscd, caching-nameserver and ssh

Felipe Alfaro Solana lkml at mac.com
Sat Feb 5 18:42:48 UTC 2005


On 5 Feb 2005, at 18:56, Gérard Milmeister wrote:

> 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?

AFAIK, nscd is not limited to caching host-IP entries, but can only 
cache username-UID, groupname-GID entries. This kind of caching can 
reduce network traffic when you are using directory services like NIS, 
NIS+ or OpenLDAP to store user and group information.




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