How to make channel reservation with white IPs at home?

Question

Computer networks

There is internet from two providers. Let's say I buy several IP addresses from one. How to make sure that when one provider is disconnected, home servers are accessible from the network of another provider using the same IP?
UPD! How is it implemented in data centers?

Answer 1

No way. How do you imagine that? Only on other IPs. To do this, the balancer and DNS are configured on the 3rd side.

Answer 2

The technology is called anycast. With it, you can even make your customers automatically choose the best communication channel, even when 2 providers are available at the same time. True, when using two providers at once, there are pitfalls with torn TCP sessions, but when using only one provider at a time, there is no such problem, except for switching between them.
To implement it yourself, you will need to buy a block of 256 addresses and register an AS (for AS you need 256 addresses, for a smaller AS block they do not give). This is now 30,000 rubles a year for addresses, sort of. And plus how many sponsorship LIRs there are (I don't think you would want to become a LIR yourself).
In this case - with the presence of AS - you will have the sea .... um .. knee-deep. It is not necessary to ask the providers for consent (perhaps if they filter other people's IPs, then just warn them not to do this, but this is easier than the arrangement described below).
For independent use of anycast without an existing AS (whether you bought addresses or not) - you will have to agree with the provider so that he skips BGP announcements of IP addresses that do not belong to this provider.
And, I’m not sure, maybe yes, maybe no: will this provider still need to agree on this with their providers in turn, or is it enough that only your direct provider accepts the announcements.

Answer 3

under the same IP in any way. if it fell, then it fell.
you need either an external balancer, or configure DNS with a TTL of 10 minutes so that you can change the A record on the fly.

Answer 4

approximately:
in the DC there is 1 IP and several pieces of iron that are configured in fail-safe mode (if one of the pieces of iron dies or is dropped, the service will not fall),
but if the wire itself falls, then at least 100 pieces of iron - the IP issued by the wire will be unavailable, and the irons will be unavailable

Answer 5

in no way
in the DC is implemented through the bgp protocol, but buying a subnet is not cheap, raising a link to it through a home provider is not realistic, and throwing a commercial link is very expensive.