Msg#: 3326065 posted 4:36 pm on May 13, 2007 (gmt 0)
Caching DNS records for a long time locally can have adverse effects. Large sites with multiple webservers like Google use very short DNS TTL times (Google uses 5 minutes) for load balancing and redirecting traffic during disasters and maintenance.
So if you don't need it, don't use it. Most of the time the forwarding DNS server of your local ISP is close enough that you won't see any speed increase at all.