p2p/nat: improve gateway detection in potentialGateways function #506
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Enhances the gateway detection algorithm by: - Adding support for multiple common gateway IP patterns (X.X.X.1, X.X.X.254) - Skipping down and loopback interfaces - Implementing deduplication of gateway IPs - Improving error handling - Adding comprehensive function documentation
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Description
This PR improves the gateway detection mechanism in the NAT-PMP implementation. The current implementation makes a simple assumption that the router's IP is always X.X.X.1 in local networks, which isn't always true. The enhanced version provides more robust and flexible gateway detection by supporting multiple common gateway patterns and implementing better error handling.
Key improvements:
Support for multiple gateway IP patterns (X.X.X.1, X.X.X.254)
Skip inactive and loopback network interfaces
Implement deduplication of gateway IPs
Better error handling for network interface operations
Comprehensive function documentation
Tests
The existing test coverage for NAT-PMP functionality remains intact. The changes are primarily focused on improving the gateway detection logic without modifying the core NAT-PMP behavior. The improved implementation maintains backward compatibility while adding support for more network configurations.
The changes are defensive in nature - if a gateway can't be found using the new patterns, the function will still return the same results as before.
Additional context
This improvement addresses a limitation in gateway detection that could affect users with non-standard router configurations. The enhancement makes the NAT-PMP discovery process more reliable across different network setups while maintaining the quick discovery requirement (1-second timeout) of the original implementation.
Metadata
Fixes the TODO comment in p2p/nat/natpmp.go regarding gateway detection improvement.