Function _tcp_reachable

network_diagnostics.py:1124–1129

(host, port, timeout=4)

                    for line in f:
                        line = line.strip()
                        if not line or line.startswith('#'):
                            continue
                        parts = re.split(r'\s+', line, maxsplit=1)
                        if len(parts) != 2:
                            continue
                        pfx = re.sub(r'[^0-9a-fA-F]', '', parts[0]).lower()
                        if len(pfx) < 6:
                            continue
                        pfx = pfx[:6]