On Mon, Jun 22, 2015 at 8:10 PM, Martin Schwarz <martin.schwarz@gmail.com> wrote:

Gavin,

in 2022 your proposal (BIP as well as code) crosses the 32MB maximum
message size limit. In order to avoid deployment of code that deterministically
fails fatally in 2022, I'd propose to stop the doublings at 32MB for now and fix
the message size limit in the mean time.

There is an exception in the code for "block" messages.

https://github.com/gavinandresen/bitcoinxt/commit/c81898ec46e4962daf975e352931b848026fdc34#diff-7ec3c68a81efff79b6ca22ac1f1eabbaR3548

This means 2MB limit for all other messages. "block" messages are limited to the max block size for 2 hours into the future.

I think setting it to a week into the future might be better, since it is only a DOS protection. This would guarantee that message sizes are reasonable. The size check would still be done anyway.