I am tinkering with the bitcoin source code and trying to understand the exact working of peer discovery mechanism in the
testnet mode for which I have made the following changes:
Disabled the DNS seed discovery in order to force bitcoind to fallback to connect to hardcoded nodes.
Changed the default hardcoded nodes to my known 4 addresses, lets say A,B,C and D, which I ensure are always online.
Now, when I run the bitcoind client (call it E), it connects to one of A,B,C or D, running the same modified version of bitcoind. It gets the peer addresses from the hardcoded node that it first connects to by exchanging
addr messages but I am not sure how it proceeds after that. I have following queries:
a. If a node falls back to connect to hardcoded nodes, is it supposed to connect to only one of the hardcoded nodes like it happends in my case or can it connect to multiple hardcoded nodes ?
b. After getting peer address via the
addr message, when will the node E start connecting to those peers ?
Please point me to the relevant code files/sections if possible. Thanks