icmp support

[FlowerWrong]

ping baidu.com

not support icmp

2016/12/07 22:48:41 Unsupported packet: protocol 1
2016/12/07 22:48:42 Unsupported packet: protocol 1
2016/12/07 22:48:43 Unsupported packet: protocol 1
2016/12/07 22:48:44 Unsupported packet: protocol 1
2016/12/07 22:48:45 Unsupported packet: protocol 1
2016/12/07 22:48:46 Unsupported packet: protocol 1
2016/12/07 22:48:47 Unsupported packet: protocol 1
2016/12/07 22:48:48 Unsupported packet: protocol 1
2016/12/07 22:48:49 Unsupported packet: protocol 1
2016/12/07 22:48:50 Unsupported packet: protocol 1
2016/12/07 22:48:51 Unsupported packet: protocol 1

[yinghuocho]

I don't come out a simple and clean way to support ICMP. See previous disucssion in #2.
If we can figure out a simpler way, I will do it. Right now, I don't feel it is urgent to suport ICMP.

[FlowerWrong]

Why not just relay the icmp packet? if ping baidu, just relay the icmp packet to baidu's DNS result IP address. This may need add more route tables.

[yinghuocho]

This is not general. Support ICMP means that we need to make ICMP works for any IP address.

[FlowerWrong]

Maybe you can design it as vpn+tun2socks, if it is ip layer or below, go through vpn, or go through tun2socks. on socks 5 proxy, you can do more like surge rules. The problem is I do not know socks 5 support ftp and other protocols or not(yes, it supports all protocol up network layer). Also it is difficult to setup a vpn and a socks5 server on the same vps.

Oh! I think it is incorrect.

[TongxiJi]

@yinghuocho Now,tcp and udp works fine on Windows.
But when we use it to play some games(such as Battlefield and LOL) with ICMP data,the game will go wrong.
So supporting about icmp may be important.

Anyway,thank you very much and you are a good man.

[yinghuocho]

thank you for the appreciation. Are you chaining gotun2socks with shadowsocks? What is your solution for the games that need ICMP connectivity, VPN ?

[TongxiJi]

Yes,with shadowsocks.
Without ICMP relay, though the game works, the ping value of the game is not correct(not all games but some).
Maybe we can specify as server as a reference but this is not the final solution.

Sorry for not replying to you in time.

[FlowerWrong]

@yinghuocho transform icmp ping to tcp ping? aha

[yinghuocho]

@FlowerWrong Supporting ICMP on tun2socks needs to have a specific program/process on server-side that receives ICMP messages from client and relay to remote, also relay the response back. I have some idea how to implement this feature, just don't have sufficient time right now.