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formatting and a typo :)
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# Udp2raw-tunnel
![image0](images/image0.PNG)
A Tunnel which tunnels UDP via FakeTCP/UDP/ICMP Traffic by using Raw Socket,helps you Bypass UDP FireWalls(or Unstable UDP Environment).Its Encrpyted,Anti-Replay and Multiplexed.It aslo acts as a Connection Stablizer.
A Tunnel which tunnels UDP via FakeTCP/UDP/ICMP Traffic by using Raw Socket, helps you Bypass UDP FireWalls(or Unstable UDP Environment). Its Encrpyted, Anti-Replay and Multiplexed. It also acts as a Connection Stablizer.
[简体中文](/doc/README.zh-cn.md)
# Support Platforms
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### Send/Receive UDP Packets with ICMP/FakeTCP/UDP headers
ICMP/FakeTCP headers help you bypass UDP blocking, UDP QOS or improper UDP NAT behavior on some ISPs. In ICMP header mode,udp2raw works like an ICMP tunnel.
UDP headers are also supported.In UDP header mode,it behaves just like a normal UDP tunnel,and you can just make use of the other features(such as encrytion,anti-replay,connection stalization).
UDP headers are also supported. In UDP header mode, it behaves just like a normal UDP tunnel, and you can just make use of the other features (such as encrytion, anti-replay, or connection stalization).
### Simulated TCP with Real-time/Out-of-Order Delivery
In FakeTCP header mode,udp2raw simulates 3-way handshake while establishing a connection,simulates seq and ack_seq while data transferring. It also simulates following TCP options: `MSS`, `sackOk`, `TS`, `TS_ack`, `wscale`.Firewalls will regard FakeTCP as a TCP connection, but its essentially UDP: it supports real-time/out-of-order delivery(just as normal UDP does), no congrestion control or re-transmission. So there wont be any TCP over TCP problem when using OpenVPN.