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authorRandy Willis <willis.randy@ymail.com>2013-03-23 03:42:26 -0700
committerbitcoindev <bitcoindev@gnusha.org>2013-03-23 10:42:33 +0000
commitac16c5a65cd09301bc60c87d038d54e6e769a575 (patch)
treebfd2d5c752676203d71ed8c583d809924b3a6d25
parent81b36a0bfc4005d17a9fe1132c81593f35d62d16 (diff)
downloadpi-bitcoindev-ac16c5a65cd09301bc60c87d038d54e6e769a575.tar.gz
pi-bitcoindev-ac16c5a65cd09301bc60c87d038d54e6e769a575.zip
Re: [Bitcoin-development] A bitcoin UDP P2P protocol extension
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+Date: Sat, 23 Mar 2013 03:42:26 -0700 (PDT)
+From: Randy Willis <willis.randy@ymail.com>
+To: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
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+Subject: Re: [Bitcoin-development] A bitcoin UDP P2P protocol extension
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+Not looked at code yet, some thoughts:=0A=0A1) In IPv4 max UDP data size is=
+ 65507 bytes.=0A2) What about big messages (block)?=0A3) I think relay spee=
+d can be increased only by reducing network diameter. =0A=0AIntroducing sup=
+er-nodes with thousands of connected peers can greatly help here.=0A4) The =
+only (IMO) UDP advantage: hole punching. But requirement of active =0A=0ATC=
+P connection defies it. And hole punching will need protocol extension.=0A5=
+) unsolicited tx broadcast will increase traffic of nodes (especially well-=
+connected)=0Aand less people will run them.=0A=0A=0A---- Original Message -=
+----=0A=0AFrom: Jeff Garzik <jgarzik@exmulti.com>=0ATo: Bitcoin Development=
+ <bitcoin-development@lists.sourceforge.net>=0ACc: =0ASent: Saturday, March=
+ 23, 2013 7:17 AM=0ASubject: [Bitcoin-development] A bitcoin UDP P2P protoc=
+ol extension=0A=0AHere is a rough draft implementation of a UDP P2P protoco=
+l extension=0Afor bitcoin:=0A=0A=A0 =A0 https://github.com/jgarzik/bitcoin/=
+tree/udp=0A=A0 =A0 http://yyz.us/bitcoin/udp-v0.patch=0A=0AProtocol specif=
+ication (such that it is):=0A=0A- UDP, bound to same port as TCP P2P (norma=
+lly 8333)=0A- Active, simultaneous TCP P2P connection required (useful agai=
+nst DoS=0Aand other attacks)=0A- Same message format as TCP P2P, same pchMe=
+ssageStart conventions,=0Aetc. (my CNetMessage pull req would be helpful he=
+re)=0A- Multiple P2P messages per UDP packet permitted=0A- Max UDP packet s=
+ize 100*1024 bytes=0A- Advertises NODE_UDP in nServices=0A- New "getudpcook=
+" TCP P2P command returns a "udpcook" message,=0Acontaining a yummy cookie=
+=0A- UDP P2P commands "inv", "tx" and "addr" are handled as if received via=
+ TCP=0A- UDP P2P command "udpsub" sets a mask, that subscribes to one or mo=
+re=0Adata broadcasts.=0A- When USM_INV_BCAST mask bit is set, receive "inv"=
+ messages via UDP=0Arather than TCP.=0A=0AProject and design goals (or, why=
+ do this?):=0A=0A- It is theorized that UDP may be useful for some messages=
+ we=0Abroadcast throughout the network=0A- A productive discussion STARTS w=
+ith code, otherwise discussion=0Acontinues forever.=0A- Investigate improvi=
+ng "inv" relay speed=0A- Investigate unconditional "tx" broadcasting via UD=
+P, as "inv"=0Aalternative, for small tx's.=0A- Investigate improving block =
+relay speed (or perhaps block header relay speed)=0A- Open up new design av=
+enues, for P2P patterns more suited to UDP than=0ATCP in general.=0A=0A-- =
+=0AJeff Garzik=0AexMULTI, Inc.=0Ajgarzik@exmulti.com=0A=0A-----------------=
+-------------------------------------------------------------=0AEveryone ha=
+tes slow websites. So do we.=0AMake your web apps faster with AppDynamics=
+=0ADownload AppDynamics Lite for free today:=0Ahttp://p.sf.net/sfu/appdyn_d=
+2d_mar=0A_______________________________________________=0ABitcoin-developm=
+ent mailing list=0ABitcoin-development@lists.sourceforge.net=0Ahttps://list=
+s.sourceforge.net/lists/listinfo/bitcoin-development=0A
+
+