Re: DNS DOS increasing?

In article <cistron.171DAAD54475984F8F41345A0945DF9C39ED49@hqexchange.presidio.com>, James Smith <jsmith@PRESIDIO.com> wrote:

Get ready for more DOS-like behavior as systems get deployed that have 10 second TTLs in the DNS. These systems are used to provide multi-isp redundancy by pinging each upstreams router, and when a ping fails, start giving out a dns response using the other ISP IP range. Same FQDN, new IP.

So what we need is a tunable on the caching DNS server that says min_allowed_ttl = 300; if (ttl < min_allowed_ttl) ttl = min_allowed_ttl; If the above becomes a problem, this will happen. Mike.