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734 Views 3 Replies Latest reply: Jan 31, 2014 1:02 PM by seebvey RSS
seebvey Apprentice 49 posts since
Nov 19, 2009
Currently Being Moderated

Jan 31, 2014 5:49 AM

NTP DoS refelction attack

Hi Guys,


in Germany actually there are a lot of NTP DoS attacks running.


If you NTP Server on the Sidewinder is reachable from external, please add these line to you ntp.conf.<burbnumber or zonename of external zone>: (/secureos/etc/ntp/ntp.conf.external)


restrict default kod nomodify notrap nopeer noquery

restrict -6 default kod nomodify notrap nopeer noquery

restrict mask

restrict -6 ::1



Save and restart the ntp daemon. cf daemond restart agent=ntp


Attention: After a Firewall reboot or a GUI change of the NTP Settings, these line are gone!




Maybe you can publish a NTP-Patch for the Sidewinder Firewall.


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