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I wanted to know if there's any privacy considerations to take into account when opening the bitcoin ports on the router for a bitcoin node.

I'm using -onlynet=onion in the bitcoin.conf file and I did not modify any tor config file.

I also wonder if a remote port scan can detect I have a bitcoin port open in the router and whether changing to a random port would help privacy. thanks.

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If you are running -onlynet=onion, there is no need to open any router ports. Perhaps I misunderstand your question.

If your chain state is caught up, and bitcoind+Tor is properly configured, you should be serving data to other nodes, even behind an otherwise locked-down home router.

What result do you get when running 

$ bitcoin-cli getpeerinfo | grep true
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  • I can connect to peers but I have no inbound connections. so it seems I need to open router ports hence my question.
    – joe.js
    Jan 29, 2019 at 23:36
  • You definitely do not need open any router ports--that would defeat the purpose of Tor routing. I run my full node over Tor only, behind a locked down router with no external ports exposed. These are the steps I used for Tor config: medium.com/@lopp/…
    – 8bg
    Jan 31, 2019 at 18:10
  • @bg thank you. following that guide I am now able to have inbound connections without having to open any router ports with my tor full node.
    – joe.js
    Feb 2, 2019 at 11:19

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