I have been looking for a sniffer similar to Bitcoin P2P Network Sniffer (https://github.com/sebicas/bitcoin-sniffer) which could allow me to connect to Ethereum nodes and listen to blocks and transactions.
Does anybody know such a sniffer?
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Yes, there is software already developed that is able to connect to nodes and detect transactions, however, they do run differently than the bitcoin-sniffer on the link you have provided. Here is a couple of popular suites/frameworks that allow you to do such things, there are also plenty more out there.