Date: Thu, 30 Dec 2021 08:11:00 +0000 From: Steve O'Hara-Smith <steve@sohara.org> To: Michael Sierchio <kudzu@tenebras.com> Cc: Kurt Hackenberg <kh@panix.com>, "questions@FreeBSD.org" <questions@freebsd.org> Subject: Re: ipfw syntax clarification Message-ID: <20211230081100.61aa3ed3f093be97dd8a88d5@sohara.org> In-Reply-To: <CAHu1Y73puvD4kNDonRYv1sDujVyFh3ncF2OVs9eF35K04O3Jmw@mail.gmail.com> References: <8b2c341d-10e6-51a2-0654-86f4394865c7@tundraware.com> <Yc1MxCxJ6Mk6bsdf@rain.home> <CAHu1Y72AgMjVhv_qE1C529NcQbGOi0O-4vRTKNeO2PHK=_t%2BVQ@mail.gmail.com> <20211230070529.9dba7412d68b6c417251058d@sohara.org> <CAHu1Y73puvD4kNDonRYv1sDujVyFh3ncF2OVs9eF35K04O3Jmw@mail.gmail.com>
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On Wed, 29 Dec 2021 23:16:45 -0800 Michael Sierchio <kudzu@tenebras.com> wrote: > On Wed, Dec 29, 2021 at 11:05 PM Steve O'Hara-Smith <steve@sohara.org> > wrote: > > > On Wed, 29 Dec 2021 22:32:20 -0800 > > Michael Sierchio <kudzu@tenebras.com> wrote: > > > > > Actual location of IP addresses > > > is something known to the CDNs (Akamai, Cloudflare, AWS, etc.) and is > > > somewhat proprietary. > > > > Even they only guess based on what they can find out about who > > controls which block, > > > Not so – the location DB used by the large CDNs are empirical, and based > on RTT of probes which happen all the time from many different geo > locations. It's pretty easy to infer where the targets are. These are This is what I call guessing based on what they can find out - nobody tells them where the IP addresses are used and if the fibre running out of a router near a border happens to cross that border (or the block of IPs routed down it is spread across that border by a VPN) then there's no way to tell by RTT measurements and the CDN will guess wrong, which happens all the time. -- Steve O'Hara-Smith Odds and Ends at http://www.sohara.org/
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