Question

We are developing an android app that send and receives text messages via wifi. We use TCP sockets for this communication (ip address and random port) but the problem is that if i dont allow these port numbers from my router s "port forwarding section", messages couldnt be sent. Are there any way to get rid of this problem?

Answer 1

您可以随机从选定范围内抽取港口,然后在您的航道上走:

int port = (Math.abs(random.nextInt())) % 3000 + 1024;

这样我就产生了随机编号1024和2999。或者只是一个固定港口。

Answer 2

If both clients are behind different restrictive firewalls, you should look into holepunching, where both clients open a connection with a third server, then the third server predicts the port opened on the NAT: NAT traversal with Java, https://stackoverflow.com/questions/917385/nat-traversal-with-java/. Note that this is typically needed for P2P applications (i.e., client to client) as you describe here. Yes, it s horribly complex and nasty :(

你也许会更好地利用亚马孙云层服务等一些东西,利用一种以推力为基础的机制,向另一方通报信息接收,或许利用长期污染吉大港山区。

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