Fri Jul 22, 2022 3:26 pm
(SinglePointOfFailure)
No, also BGP with 2 carrier can work with one unique router, but obviously if you double anything but have only unique Border Router....
A Border Router (on my case) is a Router unreachable on any way from internet (= no firewall, no NAT, no queue, etc.), because use only private IP,
that act as access to "The Internet" where you can publish your IP. (and acts only as a conduit for packets)
Yes, on this case you do not have Public IP from internet like DHCP, PPPoE etc. , but directly you say to the world "This is my IP pool and I'm here"
When you have a (W+L)ISP to keep up, with businesses and families you have to guarantee the Internet to, you can't settle for a single connection to a mainstream.
Nor can you take two connections from the same provider.
Nor do you have to take two connections that come "from the same side", that is, although they are from different suppliers, the fiber cables pass close together in the path.
They have to be two suppliers, they have to be at least two fibers,
both have to have enough bandwidth if the other breaks,
and they don't have to go the same way, because if a fiber breaks due to accidents or work, they probably both break.
Obviously the tricks do not end there.