Is it safe to use the PPPoE protocol?

Question

Computer networks

Rostelecom today brought me the Internet via cable using the PPPoE protocol with a login and password that are driven into the router.
In cable networks, I do not really understand, or rather in the protocols.
And therefore, three questions:
1. Can a third party, knowing my login and password, access the Internet if he is also a Rostelecom subscriber?
2. Is there issuance of white permanent IPs using such a protocol?
3. Can, for example, technical support staff see the files on my NAS?

Answer 1

1) Yes, and this is not a protocol security problem
2) Available
3) Depends on the settings of the router that raises the pppoe session. And so they don’t see your NAS fall and no one will bother with it.

Answer 2

1. Depends on how the provider has configured authorization. Usually yes.
   
2. Yes.
   
3. No, if the NAS is connected to the network, then to yours, which is local, and does not look outside if you do not show it there.
   

Answer 3

1. Everyone most likely already has the same login and password (in the north-west 100%) about other regions is not a fact, but most likely too (exceptions are small once absorbed providers whose network is not possible to remake because it is unprofitable)
2. Yes.
3. The support staff don't care about your NAS, they have enough problems of their own.

Answer 4

Depends on how the provider has configured authorization, it can be with encryption or maybe without, but even if there is no encryption, the likelihood that someone in the city will intercept passwords is extremely small