nanog mailing list archives
Re: SORBS?!
From: Valdis.Kletnieks () vt edu
Date: Fri, 06 Apr 2012 23:02:18 -0400
On Fri, 06 Apr 2012 20:48:44 -0500, Jimmy Hess said:
That's kind of vague to say it's "unlikely to see 1 abuser". What is the probability that more IPs in the same /24 are likely to harbor abusers, given that you have received abuse from one IP?
It's similar to pirhanas or cockroaches - they can't be found everywhere, but if you spot one in a location, there's a near certainty that there's plent more in the area. Or if you don't like that, you can run a simple Monte Carlo simulation. Assume 256 customer slots, and that initially, there is a 3% chance that the next customer to arrive is evil. Also add a feedback - each time you terminate an evil customer in less than the average arrival time, the chance the next customer is evil is cut by 10% of the current value. Each time an evil customer is allowed to last 3 times the average arrival time, the chance of an evil customer goes up 10%. Simulate for various termination times for evil customers. Are there any steady-state solutions where the *average* number of evil users is one? Or does it decay down towards zero or upwards towards a high number?
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Current thread:
- Re: SORBS?!, (continued)
- Re: SORBS?! Michael Thomas (Apr 06)
- Re: SORBS?! Brielle Bruns (Apr 06)
- Re: SORBS?! Michael Thomas (Apr 06)
- Re: SORBS?! David Miller (Apr 06)
- Re: SORBS?! Mark Foster (Apr 06)
- Re: SORBS?! Brielle Bruns (Apr 06)
- Re: SORBS?! Jeroen van Aart (Apr 06)
- Re: SORBS?! Jimmy Hess (Apr 06)
- Re: SORBS?! chris (Apr 06)
- Re: SORBS?! Randy Bush (Apr 07)
- Re: SORBS?! Valdis . Kletnieks (Apr 06)
- The day SORBS goes away ... goemon (Apr 06)
- Re: The day SORBS goes away ... Suresh Ramasubramanian (Apr 06)
- Re: The day SORBS goes away ... Valdis . Kletnieks (Apr 06)
- Re: The day SORBS goes away ... Suresh Ramasubramanian (Apr 06)
- Re: The day SORBS goes away ... goemon (Apr 06)
- Re: The day SORBS goes away ... Rich Kulawiec (Apr 07)
- Re: The day SORBS goes away ... Hank Nussbacher (Apr 07)
- Re: The day SORBS goes away ... Matthew Palmer (Apr 07)
- Re: The day SORBS goes away ... Barry Shein (Apr 07)
- Re: The day SORBS goes away ... TR Shaw (Apr 07)