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Thanks, meaton.
The code may clarify the problem better 😀
Pseudo Code
NetworkExtension
[[NEPacketTunnelNetworkSettings alloc] initWithTunnelRemoteAddress:@"Remove_IP"];
tunnel.DNSSettings = [[NEDNSSettings alloc] initWithServers:@"DNS_IP"];
tunnel.DNSSettings.matchDomains = @["example.com"]
tunnel.IPv4Settings.includedRoutes = @[[[NEIPv4Route alloc] initWithDestinationAddress:@"DNS_IP" subnetMask:@"255.255.255.255"],
[[NEIPv4Route alloc] initWithDestinationAddress:@"Intranet_IP" subnetMask:@"255.255.255.255"],]
// in the NetworkExtension all *.example.com will be resolved to Intranet_IP
Client App
NSURL *url =[NSURL URLWithString:@"http://www.example.com/"]
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {/* ... */}];
[dataTask resume];
Trace
Let's say that www.example.com = Real_IP
Run the NetworkExtension
Run the Client App
The Client App lookup www.example.com toDNS_IP and the Intranet_IP return from the NetworkExtension
But another DNS query also sent out from Client APP and return the Real_IP from the DHCP DNS
Finally the Client App using the Real_IP to initialize the TCP connection