protected P2PDiscoveryOptions.NetworkInterfaceChecker getNetworkInterfaceChecker() {
    return NetworkUtility::isNetworkInterfaceAvailable;
  }
Returns a network interface checker that can be used to validate P2P options.

@return A {@link P2PDiscoveryOptions.NetworkInterfaceChecker} that checks if a network
    interface is available.
app/src/main/java/org/hyperledger/besu/cli/BesuCommand.java