ISPs Blocking Private Addresses?
Jay R. Ashworth
jra at scfn.thpl.lib.fl.us
Tue Feb 10 00:11:42 UTC 1998
On Mon, Feb 09, 1998 at 02:42:19PM -0600, Joe Shaw wrote:
> Most people use what's commonly refered to as Martian filters to filter
> out private address spacing. It allows those ISPs to use private address
> space internally and not have to worry about advertising them via external
> routing protocols and also keeps them from accepting bogus route
> announcements from other providers who haven't used the filters.
There's an important distinction to be made, Joe, betwen filtering
_packets_ and filtering _announcements_. Martian filters usually
filter packets. What you announce, and what you send, need not have
anything to do with one another.
> > Do the "default-less" ISPs filter private addresses or do they let
> > routing/forwarding do the work?
>
> Default-less?
Yes: backbones whose routers have no default place to send packets not
handled by some explicit route.
Cheers,
-- jra
--
Jay R. Ashworth jra at baylink.com
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