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* [Bitcoin-development] A bitcoin UDP P2P protocol extension
@ 2013-03-23  7:17 Jeff Garzik
  2013-03-23 10:42 ` Randy Willis
  2013-03-23 22:30 ` Mark Friedenbach
  0 siblings, 2 replies; 11+ messages in thread
From: Jeff Garzik @ 2013-03-23  7:17 UTC (permalink / raw)
  To: Bitcoin Development

Here is a rough draft implementation of a UDP P2P protocol extension
for bitcoin:

     https://github.com/jgarzik/bitcoin/tree/udp
     http://yyz.us/bitcoin/udp-v0.patch

Protocol specification (such that it is):

- UDP, bound to same port as TCP P2P (normally 8333)
- Active, simultaneous TCP P2P connection required (useful against DoS
and other attacks)
- Same message format as TCP P2P, same pchMessageStart conventions,
etc. (my CNetMessage pull req would be helpful here)
- Multiple P2P messages per UDP packet permitted
- Max UDP packet size 100*1024 bytes
- Advertises NODE_UDP in nServices
- New "getudpcook" TCP P2P command returns a "udpcook" message,
containing a yummy cookie
- UDP P2P commands "inv", "tx" and "addr" are handled as if received via TCP
- UDP P2P command "udpsub" sets a mask, that subscribes to one or more
data broadcasts.
- When USM_INV_BCAST mask bit is set, receive "inv" messages via UDP
rather than TCP.

Project and design goals (or, why do this?):

- It is theorized that UDP may be useful for some messages we
broadcast throughout the network
- A productive discussion STARTS with code, otherwise discussion
continues forever.
- Investigate improving "inv" relay speed
- Investigate unconditional "tx" broadcasting via UDP, as "inv"
alternative, for small tx's.
- Investigate improving block relay speed (or perhaps block header relay speed)
- Open up new design avenues, for P2P patterns more suited to UDP than
TCP in general.

-- 
Jeff Garzik
exMULTI, Inc.
jgarzik@exmulti.com



^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2013-03-24  9:24 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-03-23  7:17 [Bitcoin-development] A bitcoin UDP P2P protocol extension Jeff Garzik
2013-03-23 10:42 ` Randy Willis
2013-03-23 14:52   ` Luke-Jr
2013-03-23 15:24     ` Jeff Garzik
2013-03-23 22:01       ` Caleb James DeLisle
2013-03-23 22:30 ` Mark Friedenbach
2013-03-24  0:57   ` Jay F
2013-03-24  1:22     ` Gregory Maxwell
2013-03-24  2:08       ` Jeff Garzik
2013-03-24  9:11         ` Ralph J.Mayer
2013-03-24  2:27     ` Mark Friedenbach

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