nanog mailing list archives

Re: ISP port blocking practice


From: Valdis.Kletnieks () vt edu
Date: Fri, 23 Oct 2009 01:29:01 -0400

On Thu, 22 Oct 2009 22:36:13 EDT, Jon Kibler said:

   4) Never allow traffic to ingress any network if the source address is bogus.

4a) Never flag a source address as bogus unless you can verify it is bogus
*today*, not when you installed the filter.  Out of date bogon filters are evil.

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