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Re: Customer-facing ACLs
From: Robert Beverly <rbeverly () rbeverly net>
Date: Fri, 7 Mar 2008 15:35:27 -0500
On Fri, Mar 07, 2008 at 01:55:05PM -0600, Justin Shore wrote:
What kind of customer-facing filtering do you do (ingress and egress)? This of course is dependent on the type of customer, so lets assume we're talking about an average residential customer.
... As part of a recent measurement project, we estimate the prevalence of ingress and egress blocking (though under the guise of neutrality). For customer facing filters, we leverage protocols which provide port-specific redirects, e.g. HTTP, Gnutella, etc. For traffic toward customers, we use port-specific tcptraceroutes. Some published data for the curious: http://ana.csail.mit.edu/rsp/ Reader's digest summary: NetBIOS ports (and the innocent profile service) 135-139 are among the most frequently blocked, along with SMTP, POP3 and filters that have stuck around due to various worms such as MS-SQL. That said, around 94% of the 16bit port space was unblocked by any network. Curious to other's answer to this high-level question -- and the more mundane question of filter maintenance. rob
Current thread:
- Customer-facing ACLs Justin Shore (Mar 07)
- Re: Customer-facing ACLs Justin M. Streiner (Mar 07)
- Re: Customer-facing ACLs Kameron Gasso (Mar 07)
- RE: Customer-facing ACLs Frank Bulk (Mar 07)
- Re: Customer-facing ACLs Kameron Gasso (Mar 07)
- Re: Customer-facing ACLs Valdis . Kletnieks (Mar 07)
- Re: Customer-facing ACLs Justin Shore (Mar 07)
- RE: Customer-facing ACLs Tim Sanderson (Mar 07)
- Re: Customer-facing ACLs Dan Armstrong (Mar 07)
- Re: Customer-facing ACLs Justin Shore (Mar 07)
- Re: Customer-facing ACLs Robert Beverly (Mar 07)
- Re: Customer-facing ACLs Danny McPherson (Mar 07)
- Re: Customer-facing ACLs Mark Tinka (Mar 08)
- Re: Customer-facing ACLs Adrian Chadd (Mar 10)
- Re: Customer-facing ACLs Jo Rhett (Mar 10)
- Re: Customer-facing ACLs Christopher Morrow (Mar 11)
- <Possible follow-ups>
- Re: Customer-facing ACLs Scott Weeks (Mar 07)
- Re: Customer-facing ACLs Justin Shore (Mar 07)
- Re: Customer-facing ACLs Dave Pooser (Mar 07)
- Re: Customer-facing ACLs Joel Jaeggli (Mar 07)
- Re: Customer-facing ACLs Justin Shore (Mar 07)
- Re: Customer-facing ACLs Justin M. Streiner (Mar 07)
- Re: Customer-facing ACLs Scott Weeks (Mar 07)