[54113] in North American Network Operators' Group
Re: FW: /8s and filtering
daemon@ATHENA.MIT.EDU (Harsha Narayan)
Tue Dec 10 15:18:12 2002
Date: Tue, 10 Dec 2002 12:13:49 -0800 (PST)
From: Harsha Narayan <hnarayan@cs.ucsd.edu>
To: <bmanning@vacation.karoshi.com>
Cc: <nanog@merit.edu>
In-Reply-To: <200212101952.gBAJqWS19373@vacation.karoshi.com>
Errors-To: owner-nanog-outgoing@merit.edu
Hello,
Thank you very much everyone for all your replies. When Class C space
gets used up, wouldn't the filtering policies have to change to allow the
same kind of multihoming from the Class A space. Currently, a /24 from
Class C is enough to get past filters. However later, a /22 (or is it /20)
from Class A would be required to get past filters.
Since there are only three /8s left in Class C, I was curious whether
filtering policies would change to accommodate this.
If filtering policies won't change ARIN will have to change its
multihoming PA policy to giving away a /22 instead of a /24. Though
officially it is RIR policy not to worry about the routability of an
a prefix I guess they do worry about it?
Thanks,
Harsha.
On Tue, 10 Dec 2002 bmanning@vacation.karoshi.com wrote:
> >
> >
> > Hello,
> > Now I am confused because I have got two sets of contradicting answers.
> > Some say that anyone can multihome, some say that you need to be of a
> > certain minimum size to multihome. May I know what is the right answer?
> >
> > I agree that allowing anyone to multihome would increase the size of the
> > routing table. So does this mean that someone has to be of a certain size
> > to multihome?
> >
> > Harsha.
> >
>
> anyone can multihome, with the cooperation of others.
> current practice seems to dictate that the standard
> operating procedures to protect the integrity of
> the routing system mandate that only prefixes of
> certain lengths are allowed at -SOME- isp boundaries.
>
> you seem to have the assumption that there is a single
> standard here. There is not.
>
> --bill
>
