If adapter type is unknown and interface name is "ipsec", treat as VPN.

webrtc/rtc_base/network.cc

Index: webrtc/rtc_base/network.cc
diff --git a/webrtc/rtc_base/network.cc b/webrtc/rtc_base/network.cc
index 1f4a705db030e5b689e46b5fc460e7571e24e609..e68ec0b4c2372a164ce6663abc2f864d1624bfab 100644
--- a/webrtc/rtc_base/network.cc
+++ b/webrtc/rtc_base/network.cc
@@ -801,6 +801,9 @@ AdapterType BasicNetworkManager::GetAdapterTypeFromName(
       return type;
     }
   }
+  if (strncmp(network_name, "ipsec", 5) == 0) {
+    return ADAPTER_TYPE_VPN;
+  }
 #if defined(WEBRTC_IOS)
   // Cell networks are pdp_ipN on iOS.
   if (strncmp(network_name, "pdp_ip", 6) == 0) {