Really though I don't think named in a caching configuration is too bad of a pig on ram, and there are high performance/low ram alternatives that just do caching.
I'm using pdnsd here, wich also has the capability to periodically check the DNS servers it forwards to and mark them as up/down depending on the result (so if a server is marked as down due to a query timeout, after a configuarble interval it's recheked and marked up if it responds).
In many cases I think this might be a better solution (than dynamically updating resolv.conf) to the problem of multiple occasionally unreliable name servers.
My guess is that there are leaner DNS proxies using less resources than pdnsd, with less flexibility, as well that can do this. (Maybe dnsmasq can, I don't know...)
Regards /Jonas -- Jonas Eckerman, FSDB & Fruktträdet http://whatever.frukt.org/ http://www.fsdb.org/ http://www.frukt.org/
