If network enumeration fails, try binding to the "ANY" address.

webrtc/base/network.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 124 matching lines @@
 };
 
 // Base class for NetworkManager implementations.
 class NetworkManagerBase : public NetworkManager {
  public:
   NetworkManagerBase();
   ~NetworkManagerBase() override;
 
   void GetNetworks(NetworkList* networks) const override;
   void GetAnyAddressNetworks(NetworkList* networks) override;
+  // Defaults to true.
   bool ipv6_enabled() const { return ipv6_enabled_; }
   void set_ipv6_enabled(bool enabled) { ipv6_enabled_ = enabled; }
 
   void set_max_ipv6_networks(int networks) { max_ipv6_networks_ = networks; }
   int max_ipv6_networks() { return max_ipv6_networks_; }
 
   EnumerationPermission enumeration_permission() const override;
 
   bool GetDefaultLocalAddress(int family, IPAddress* ipaddr) const override;
 
@@ skipping 264 matching lines @@
   int preference_;
   bool active_ = true;
   uint16_t id_ = 0;
 
   friend class NetworkManager;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_NETWORK_H_