nanog mailing list archives
Re: Filter NTP traffic by packet size?
From: Robert Drake <rdrake () direcpath com>
Date: Wed, 26 Feb 2014 17:48:59 -0500
On 2/26/2014 5:33 PM, Valdis.Kletnieks () vt edu wrote:
I would do it. I scanned all my public and private networks and found a few. I've added it to our customer acls to stop it. There were also a couple of internal routers that someone had turned or left it on that were missed. Those are now fixed.On Wed, 26 Feb 2014 11:44:55 -0600, Brandon Galbraith said:Blocking chargen at the edge doesn't seem to be outside of the realm of possibilities.What systems are (a) still have chargen enabled and (b) common enough to make it a viable DDoS vector? Just wondering if I need to go around and find users of mine that need to be smacked around with a large trout....
nmap -T4 -oG chargen_scan.txt -sS -sU -p 19 <your netblocks here>
Current thread:
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?), (continued)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Jay Ashworth (Feb 28)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Christopher Morrow (Feb 28)
- Re: Filter NTP traffic by packet size? Valdis . Kletnieks (Feb 26)
- Re: Filter NTP traffic by packet size? Jared Mauch (Feb 26)
- Re: Filter NTP traffic by packet size? Randy Bush (Feb 26)
- Re: Filter NTP traffic by packet size? Frank Habicht (Feb 26)
- Re: Filter NTP traffic by packet size? Jimmy Hess (Feb 26)
- Re: Filter NTP traffic by packet size? Niels Bakker (Feb 28)
- Re: Filter NTP traffic by packet size? Randy Bush (Feb 28)
- Re: Filter NTP traffic by packet size? Niels Bakker (Feb 28)
- Re: Filter NTP traffic by packet size? Robert Drake (Feb 26)
- Re: Filter NTP traffic by packet size? Keegan Holley (Feb 27)
- Re: Filter NTP traffic by packet size? Jimmy Hess (Feb 26)
- Re: Filter NTP traffic by packet size? Robert Drake (Feb 26)
- Re: Filter NTP traffic by packet size? Cb B (Feb 25)
- Re: Filter on IXP Jérôme Nicolle (Feb 28)
- Re: Filter on IXP Jay Ashworth (Feb 28)
- Re: Filter on IXP Jérôme Nicolle (Feb 28)
- Re: Filter on IXP Randy Bush (Feb 28)
- Re: Filter on IXP Jérôme Nicolle (Feb 28)
- Re: Filter on IXP Nick Hilliard (Feb 28)