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Re: ISPs Blocking Private Addresses?
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 firstname.lastname@example.org Member of the Technical Staff Unsolicited Commercial Emailers Sued The Suncoast Freenet "Two words: Darth Doogie." -- Jason Colby, Tampa Bay, Florida on alt.fan.heinlein +1 813 790 7592 Managing Editor, Top Of The Key sports e-zine ------------ http://www.totk.com