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So, substrate uses a bunch of network messages like block announce, grandpa message, block request-response, transaction. Substrate has notification substream open sending and receiving these messages and may be some other data as well. I expect that there might be some limit on size of the data substrate receives, because otherwise people can send huge amount of data to do DoS. So, is there a size limit on these network messages and how much? For more context, look at https://github.com/ChainSafe/gossamer/issues/2399

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Different subprotocols are using different limits:

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