Can neighbors mix protocols?

Question

Consider the following, each of two peers has both TCP and UDP propery forwarded and bound:

Peer A
-> tcp 15600
-> udp 14600

Peer B
-> tcp 15600
-> udp 14600

Which of the following conditions will result in a successful connection:

# Valid TCP Connection
Peer A adds [ Peer B : tcp 15600 ]
Peer B adds [ Peer A : tcp 15600 ]

# Valid UDP Connection
Peer A adds [ Peer B : udp 14600 ]
Peer B adds [ Peer A : udp 14600 ]

But what will happen if the peers add each-other on different protocols?

Peer A adds [ Peer B : tcp : 15600 ]
Peer B adds [ Peer A : udp : 14600 ]

Will this scenario result in a mutual connection between nodes?

Answer 1

No, different protocols will not work.

When receiving a packet from your neighbor, iri will validate if the source of the packet is in your neighbors list. As the port numbers differ, the packets will get rejected.

Source: https://github.com/iotaledger/iri/blob/acfbc76f39c785aa0914f8bcb6745f34d8f6511b/src/main/java/com/iota/iri/network/Node.java#L244-L246