Date: Sat, 21 Aug 1999 14:25:51 -0400 From: Mark Conway Wirt <mark@intrepid.net> To: pam@polynet.lviv.ua, isp@FreeBSD.ORG Subject: Re: [Offtopic Q] Smallest network feasible to announce as separate AS route in Internet Message-ID: <19990821142551.F22209@intrepid.net> In-Reply-To: <19990820181556.48796153B5@hub.freebsd.org>; from pam@polynet.lviv.ua on Fri, Aug 20, 1999 at 09:15:32PM %2B0300 References: <19990820181556.48796153B5@hub.freebsd.org>
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On Fri, Aug 20, 1999 at 09:15:32PM +0300, pam@polynet.lviv.ua wrote: > Hello! > > I have one very practical question. I've heard that backbone routers > in the Internet have installed route filters blocking BGP > announcements of very small networks. > > What is the smallest network prefix, which could be safely > announced as multi-homed (via separate AS number) in the > Internet? > > Thanks for help and appologies for being offtopic. Used to be that a /19 was the safest that not filtered by various providers (unless you could get space in the older allocations -- I've seen /28's routed in there :-), but with ARIN changing it's allocation policies, more and more providers are relaxing the limits. A /19 should be a safe bet, though. If you can't get one, make sure that the address space you get is in the old, not-filtered region (can't remember the range, but someone on the list may know) --Mark To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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