In the Bitcoin system to discover new nodes, each node communicates with its peers by sending getaddr() to the peers. Based on the bitcoin implementation:

//! the maximum percentage of nodes to return in a getaddr call

//! the maximum number of nodes to return in a getaddr call

Based on Eclipse Attacks on Bitcoin’s Peer-to-Peer Network ∗

The peer responds with n randomly selected addresses from its tried and new tables, where n is a random number between x and 2500 and x is 23% of the addresses the peer has stored.

The reason behind this is to eliminate an eclipse attack (aka netsplit), where an attacker monopolizes the environment of a node by sending it compromised addresses.

The receiving node accepts a maximum of 1000 addresses because it is limited to a buffer size that can only hold 1000 addresses.

What is the 23% or the 2500 addresses based on?

Why is the buffer size limited to 1000 addresses?


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy