[133263] in North American Network Operators' Group
Re: ARIN space not accepted
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Tue Dec 7 18:40:55 2010
To: NANOG list <nanog@nanog.org>
In-Reply-To: Your message of "Mon, 06 Dec 2010 17:02:40 PST."
<4CFD87B0.9000703@mompl.net>
From: Valdis.Kletnieks@vt.edu
Date: Tue, 07 Dec 2010 18:40:20 -0500
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Mon, 06 Dec 2010 17:02:40 PST, somebody said:
> >>> From: Valdis.Kletnieks@vt.edu
> >>>> From: Valdis.Kletnieks@vt.edu
> >>> Date: Fri, 03 Dec 2010 20:00:15 -0500
>
> >>>> 224/3
> >>> Oh. And don't forget to do *bidirectional* filtering of these addresses. ;)
> >> Ahh, not quite. Blocking 224/3 bi-directionally might cause a few issues
> >> if you accept multicast traffic from anyone.
If you're smart enough to actually do multicast, you're smart enough to remove
the filter for 224/3. If you're not smart enough to remove the filter, or
you're smart enough but you're one of the 95% that doesn't do multicast, your
site should be doing bidirectional filtering of 224/3. ;)
(Do you really want your users emitting outbound packets to/from 224/3 if you
don't actually do multicast? Probably not...)
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