nanog mailing list archives
Re: OpenNTPProject.org
From: Brian Rak <brak () gameservers com>
Date: Mon, 17 Feb 2014 08:45:32 -0500
Rate limitings been in place for quite some time, but I believe it's only for actual time queries. This DDOS uses monlist, which isn't subject to the same rate limits.
You've disabled monlist now, so I bet you'll no longer need all the rate limiting IPTables rules. (Though, you'll still see the incoming garbage for awhile, but NTPD will just discard it so it shouldn't cause problems).
On 2/17/2014 2:23 AM, Pete Ashdown wrote:
On 2/16/14, 7:38 PM, Brian Rak wrote:Seriously, just fix your configuration. The part of NTP being abused is completely unrelated to actually synchronizing time. It's a management query, that has no real reason to be enabled remotely. You don't even need to resort to iptables for this, because NTPD has built in rate limiting (which isn't enabled for management queries, but those are trivial to disable).Thanks for the tip, monitoring is off. I was under the impression that rate-limiting hadn't made it into a stable version of ntpd yet. Is that incorrect?
Current thread:
- Re: OpenNTPProject.org, (continued)
- Re: OpenNTPProject.org Lyndon Nerenberg (Feb 16)
- Re: OpenNTPProject.org Mark Tinka (Feb 16)
- Re: OpenNTPProject.org Christopher Morrow (Feb 16)
- Re: OpenNTPProject.org Yucong Sun (Feb 17)
- JunOS NTP - Re: OpenNTPProject.org Jared Mauch (Feb 18)
- Re: JunOS NTP - Re: OpenNTPProject.org John Kristoff (Feb 18)
- Re: JunOS NTP - Re: OpenNTPProject.org Mark Tinka (Feb 18)
- Re: OpenNTPProject.org Mark Tinka (Feb 16)
- Re: OpenNTPProject.org Harlan Stenn (Feb 17)
- Re: OpenNTPProject.org Brian Rak (Feb 17)