On Mon, 9 Feb 2009 14:07:26 -0800 (PST), jlevine <jlev...@boulder.nist.gov> wrote for the entire planet to see:
>In the last few days I have seen an increasing number of systems that >are requesting the time in NTP format several times per second. Have you considered the possibility that they are spoofed queries from a botnet? There are some records of which IPs are the current/past targets. There have been a number of recent DDoS attacks using spoofed UDP packets. The usual attack uses port 53 (DNS) and attempts to get 'amplification' of a small query into a large response towards the victim IP. NTP packets are the same size both ways, but might still be used to help with a flood. The only mitigation I can think of here is for NTP to not respond to excessive rate queries at all, or very infrequently, after the KOD. - Eric _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
