DNS pulling BGP routes?

Baldur Norddahl baldur.norddahl at gmail.com
Mon Oct 18 17:28:35 UTC 2021

On Mon, 18 Oct 2021 at 09:51, Masataka Ohta <
mohta at necom830.hpcl.titech.ac.jp> wrote:

> But, with settlement free peering between tier 1 ISPs, tier 2
> ISPs having transit/paid peering with a tier 1 ISP will receive
> routes from peers of the tier 1 ISP. There is transit traffic
> exchanged between tier 1 ISPs over settlement free peering.
> So, I don't think distinguishing transit from peering
> meaningful for precise discussions.

Around here there are certain expectations if you sell a product called IP
Transit and other expectations if you call the product paid peering. The
latter is not providing the whole internet and is cheaper.

The so-called "tier" of a company is a meaningless term. Traffic will never
traverse two settlement free peering links and this is true for "tier 1"
ISPs as well. Paid peering is understood to be the same as a settlement
free peering except for not being settlement free. Therefore a paid peering
with an "tier 1" ISP will not provide any traffic that traverses their
settlement free peering links with other "tier 1" ISPs. It is quite
possible some "tier 1" ISPs do not see the point in providing such a
product but then they just won't offer paid peering - only IP transit.

In more technical terms, no peering link, settlement free or for pay, has
routes for the whole internet. If the peering had routes for the whole
internet it would be IP transit. This is achieved by only announcing own
customer routes on the peering links and _not_ announcing routes received
from other peering links. You get access to their customers but you need to
make other arrangements to get access to the rest of the internet.

> > For smaller ISPs it works the other way around. An evil CDN could
> > attempt to charge us, the small ISP. I am happy that is not
> > happening.
> Because of natural monopoly and PON, most access/retail ISPs
> enjoy their domination in their own area regardless of their
> sizes.

This is not true in our part of the world. The regulator is requiring all
major last mile infrastructure owners to give access to reseller ISPs
breaking that monopoly. My own company both owns infrastructure (FTTH and
FTTB / apartment networks) and resell using FTTH / DSL owned by other
companies. Plus we have three 5G networks providing an alternative and also
breaking the monopoly.


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