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badb edited this page May 17, 2017 · 3 revisions

Original whitepaper

P2P default parameters

PING_INTERVAL = 2 * 60
TIMEOUT_INTERVAL = 20 * 60
MAX_PROTOCOL_MESSAGE_LENGTH = 2 * 1024 * 1024
Incoming connections = 125
Outgoing connections = 10

More can be found here

NAT-punching

TL;DR No NAT-punching, UPnP (optional) based on miniupnp

Bitcoin works properly only using outgoing connection, but incoming connections can increase performance - https://bitcointalk.org/index.php?topic=30947.0

Node that accepts incoming connection and have a proper port open or supports UPnP is so called listening node.

In bitcoin there is no need to have direct connection so NAT-punching is not really needed. https://bitcointalk.org/index.php?topic=85447.0

External IP address is taken from external servers. Different bitcoin clients in the same network: http://bitcoin.stackexchange.com/questions/22044/why-satoshi-clients-upnp-part-maps-to-a-fixed-external-port-8333-by-default

If you're behind NAT and don't support incoming connections you're not doing anything positive for the network: http://bitcoin.stackexchange.com/questions/300/should-i-leave-the-bitcoin-client-open