I recently read this paper "A Look Back at Security Problems in the TCP/IP Protocol Suite" (https://www.cs.columbia.edu/~smb/papers/acsac-ipext.pdf) explaining few attacks at the TCP/IP stack.
One attack is at TCP layer (SYN flood, or DoS). Another is at the routing layer, i.e. RIP and BGP protocol. I understand that SSL and HIP provide encryption + authentication at level above IP layer, hence it doesn't really solve problem at the routing layer.
My question is that whether there are real/practical routing-based attacks when SSL or HIP are used, or are they merely academic problems? I mean, if the flow is encrypted and authenticated, what gain would the attacker have in being able to redirect or sniff the traffic?
What are the current techniques for securing routing protocols?