nanog mailing list archives
Re: Filter NTP traffic by packet size?
From: Brandon Galbraith <brandon.galbraith () gmail com>
Date: Wed, 26 Feb 2014 11:44:55 -0600
On Wed, Feb 26, 2014 at 6:56 AM, Keegan Holley <no.spam () comcast net> wrote:
More politely stated, it’s not the responsibility of the operator to
decide what belongs on the network and what doesn’t. Users can run any services that’s not illegal or even reuse ports for other applications. That being said commonly exploited ports (TCP 25 for example) are often blocked. This is usually done to block or protect an application though not to single out a particular port number. Don't most residential ISPs already block port 25 outbound? http://www.postcastserver.com/help/Port_25_Blocking.aspx Blocking chargen at the edge doesn't seem to be outside of the realm of possibilities.
Current thread:
- Re: Filter NTP traffic by packet size?, (continued)
- Re: Filter NTP traffic by packet size? sjt5atra (Feb 24)
- Re: Filter NTP traffic by packet size? Jérôme Nicolle (Feb 28)
- Re: Filter NTP traffic by packet size? Mikael Abrahamsson (Feb 23)
- Re: Filter NTP traffic by packet size? Randy Bush (Feb 23)
- Re: Filter NTP traffic by packet size? Ray Soucy (Feb 24)
- Re: Filter NTP traffic by packet size? Blake Hudson (Feb 25)
- RE: Filter NTP traffic by packet size? Staudinger, Malcolm (Feb 25)
- Re: Filter NTP traffic by packet size? Nick Hilliard (Feb 25)
- Re: Filter NTP traffic by packet size? Blake Hudson (Feb 25)
- Re: Filter NTP traffic by packet size? Keegan Holley (Feb 26)
- Re: Filter NTP traffic by packet size? Brandon Galbraith (Feb 26)
- Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Jay Ashworth (Feb 26)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Keegan Holley (Feb 27)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Ray Soucy (Feb 28)
- 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?) Ray Soucy (Feb 28)
- 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)