UDP forwarding doesn't seem to work

[Mygod]

Please read FAQ then answer these questions before submitting your issue. Thanks!

Environment

• Android version: 7.1.1
• Device: bacon
• Shadowsocks version: b3bab98
• Last version that did not exhibit the issue (if applicable):

Configuration

Put an x inside the [ ] that applies.

• IPv4 server address
• IPv6 server address
• Client IPv4 availability
• Client IPv6 availability
• Local port: 1080
• Encrypt method: chacha20
• One-time authentication
• Route
  • All
  • Bypass LAN
  • Bypass China
  • Bypass LAN & China
  • GFW List
  • China List
  • Custom rules
• IPv6 route
• Per-App Proxy
  • Bypass mode
• UDP Forwarding
• TCP Fast Open
• NAT mode

What did you do?

1. Connect with UDP forwarding on;
2. Connect with plugin KCP.

What did you expect to see?

If 2 works (which implies that I have a working UDP connection), 1 should work as well.

What did you see instead?

2 works while 1 fails.

[madeye]

It's quite tricky here. To make UDP and kcptun both work, you have to add additional parameters to plugin_opts. For example:

On the server

ss-server -c config.json --plugin kcp-server -s 443 --plugin-opts "listen=0.0.0.0:444" -u

On the client

ss-local -c config.json --plugin kcp-local --plugin-opts "remoteaddr=server_ip:444" -u

[madeye]

And we may add this to FAQ.

[Mygod]

I meant:

1. UDP on and KCP off;
2. UDP off and KCP on.

And I'm running kcptun at server side independently.

[madeye]

Hmm.. I tried UDP forwarding locally, and it works well... Any chance it's a network issue?

[Mygod]

Wait it turns out I have never set up UDP forwarding on my server side... Why do I remember it used to work? Never mind...

[Mygod]

Hmm and I don't think it's necessary to add that to FAQ since SIP003 doesn't support UDP for now.

[coolicer]

@madeye 先启动ss-server，再启动kcp行不行。

[madeye]

@coolicer Yes, it also works.

[coolicer]

@madeye 还是有问题的。
kcp我这样启动的
./kcp_server -l 0.0.0.0:444 -t SS_SERVER_IP:PORT

然后android的configure是这样:
remoteaddr=server_ip:444;