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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: commonly blocked ISP ports
On Wed, 14 Sep 2005 14:42:56 CDT, Luke Parrish said: > We have a list, some reactive and some proactive, however we need to remove > ports that are no longer a threat and add new ones as they are published. All ports that are open are threats, at least potentially. What you *should* be doing is: a) When you block a new port due to a current exploit, log the fact. b) Work with customers/users to make sure they're patched, and that new machines are patched before they go live. c) When probing for the port stops (which it never does), or some sufficient number of downstream boxes are patched and safe, remove the block. Either that, or block the world, and open ports on request. Remember - *you* are the only one on this list who really knows if a given port is a threat anymore.... (And that's totally skipping all the noise about corporate firewalls versus ISP firewalls and different expectations regarding security/transparency...) Attachment:
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