Previously tcp_check required both ICMP and TCP to pass. This caused
two failure modes: hosts with ICMP rate-limiting under scan load were
missed (ICMP fails → TCP never tried), and the AND logic was confusing.
In TCP-only mode, proxy-ARP gateways are still filtered out because
they never spoof TCP replies. Hosts with rate-limited ICMP (e.g. some
WiFi APs during a full /24 sweep) are now correctly detected via TCP.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
olivier
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