From: Matt Corallo <lf-lists@mattcorallo•com>
To: Eric Voskuil <eric@voskuil•org>,
Bitcoin Protocol Discussion
<bitcoin-dev@lists•linuxfoundation.org>,
Pieter Wuille <pieter.wuille@gmail•com>
Cc: libbitcoin@lists•dyne.org
Subject: Re: [bitcoin-dev] BIP151 protocol incompatibility
Date: Mon, 13 Feb 2017 11:11:11 +0000 [thread overview]
Message-ID: <9ECDD902-1D2C-4500-8FC2-4DADF46E4318@mattcorallo.com> (raw)
In-Reply-To: <9ca02a65-23df-5eb4-f9bd-7e05b54ec4ea@voskuil.org>
I believe many, if not all, of those messages are sent irrespective of version number.
In any case, I fail to see how adding any additional messages which are ignored by old peers amounts to a lack of backward compatibility.
On February 13, 2017 11:54:23 AM GMT+01:00, Eric Voskuil <eric@voskuil•org> wrote:
>On 02/13/2017 02:16 AM, Matt Corallo wrote:
>> For the reasons Pieter listed, an explicit part of our version
>handshake and protocol negotiation is the exchange of otherwise-ignored
>messages to set up optional features.
>
>Only if the peer is at the protocol level that allows the message:
>
>compact blocks:
>
>https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L217-L242
>
>fee filter:
>
>https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L211-L216
>
>send headers:
>
>https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L204-L210
>
>filters:
>
>https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L170-L196
>
>> Peers that do not support this ignore such messages, just as if they
>had indicated they wouldn't support it, see, eg BIP 152's handshake.
>Not
>sure why you consider this backwards incompatible, as I would say it's
>pretty clearly allowing old nodes to communicate just fine.
>
>No, it is not the same as BIP152. Control messages apart from BIP151
>are
>not sent until *after* the version is negotiated.
>
>I assume that BIP151 is different in this manner because it has a
>desire
>to negotiate encryption before any other communications, including
>version.
>
>e
next prev parent reply other threads:[~2017-02-13 11:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-13 5:18 Eric Voskuil
2017-02-13 8:47 ` Pieter Wuille
2017-02-13 9:36 ` Eric Voskuil
2017-02-13 10:07 ` Jonas Schnelli
2017-02-13 10:30 ` Eric Voskuil
2017-02-13 11:14 ` Jonas Schnelli
2017-02-14 19:54 ` Eric Voskuil
2017-02-14 20:58 ` Jonas Schnelli
2017-02-13 10:16 ` Matt Corallo
2017-02-13 10:54 ` Eric Voskuil
2017-02-13 11:11 ` Matt Corallo [this message]
2017-02-13 11:17 ` Eric Voskuil
2017-02-13 13:04 ` Matt Corallo
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