Issue Details

Number

31339

Title

Avoid internet traffic from tests

Description

### Current behaviour Tests should not try to open connections to the internet because: * they may succeed or fail unpredictably, depending on external environment * are slow * dox the developer to their ISP that they are running Bitcoin Core tests ### Expected behaviour Tests should only open local connections (e.g. on the `lo` interface). Enforce this in the CI, having it to detect non-local traffic and fail accordingly. ### Steps to reproduce Run the functional tests and monitor the traffic. ### Relevant log output _No response_ ### How did you obtain Bitcoin Core Compiled from source ### What version of Bitcoin Core are you using? master@22ef95dbe3e467039e6cd18988e66557d94041d1 ### Operating system and version Ubuntu 28.04 LTS --- This is being fixed in two parts: * [x] Fix all tests as of Jan 15 2025: https://github.com/bitcoin/bitcoin/pull/31646 * [ ] Detect future regressions in CI: https://github.com/bitcoin/bitcoin/pull/31349

URL

https://github.com/bitcoin/bitcoin/issue/31339

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