i'm quite weird at the moment, cause i don't understand a basic issue here:
R1(CPE) -- R2 -- R3 -- R4 -- internet
R1 and R4 have a multihop bgp peering.
so R1 for all routes has hext hop R4 address...
how exactly is the traffic forwarded through R2 and R3?
am i right, that all routers in between need a default route towards internet and also routes for the announced networks on CPE side?