We have a two-dozen line long ACL applied to our CMTS and BRAS blocking Windows and "virus" ports and have never had a complaint or a problem. We do have a more sophisticated residential or large-biz customers ask, but only once has our ACL been the source of a problem and it's only because the OEM version of the software didn't implement communications the same way as their branded version. Frank -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Sean Donelan Sent: Monday, March 10, 2008 2:30 PM To: Scott Weeks Cc: nanog@merit.edu Subject: Re: Customer-facing ACLs On Mon, 10 Mar 2008, Scott Weeks wrote:
The hard part is I now always take over networks that have been in operation a long time and enabling these policies can be very painful after the fact. Establishing them when the network is new is a different story.
Whatever you decide, whether you know what the policies are or not, there are always have a set of default network policies. The question is do you explain to you customers just as carefully what your default policy doesn't do, as well as what it does. Do you take just as much time to carefully explain the risks and what may break to your customers of allowing that traffic as you would of not allowing that traffic. It seems to be very painful whatever decision is made.