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To: nanog@merit.edu From: Miquel van Smoorenburg <miquels@cistron.nl> Date: Mon, 21 Jan 2002 17:58:03 +0000 (UTC) Message-ID: <a2hkrb$9sh$1@ncc1701.cistron.net> X-Complaints-To: abuse@cistron.nl Errors-To: owner-nanog-outgoing@merit.edu 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.
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