An Encrypted, Anti-Replay, Multiplexed UDP Tunnel which can help you Bypass UDP Block or QoS by tunneling UDP traffic through Fake-TCP or ICMP by using raw socket.It also acts as a Connection Stabilizer.
Send / Receive UDP Packet with fake-TCP/ICMP headers
Fake-TCP/ICMP headers help you bypass UDP blocking, UDP QoS or improper UDP NAT behavior on some ISPs. Raw packets with 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.
Simulate TCP Handshake
Simulates the 3-way handshake, along with seq and ack_seq. TCP options MSS, sackOk, TS, TS_ack, wscale are also simulated. Real-time delivery guaranteed, no TCP over TCP problem when using OpenVPN.
Encryption, Anti-Replay, No MITM
- Encrypt your traffic with AES-128-CBC.
- Protect data integrity by MD5 or CRC32.
- Defense replay attack with an anti-replay window, similar to IPSec and OpenVPN.
- Authenticate mutually, no MITM attacks.
Failure Detection & Stabilization (Connection Recovery)
Connection failures are detected by heartbeats. If timed-out, a client will automatically change the port number and reconnect. If reconnection is successful, the previous connection will be recovered, and all existing UDP conversations will stay valid.
For example, if you use UDP2RAW + OpenVPN, OpenVPN won’t lose connection after any reconnect, even if the network cable is re-plugged or the WiFi access point is changed.
- Multiplexing One client can handle multiple UDP connections, all of which share the same raw connection.
- Multiple Clients One server can have multiple clients.
- NAT Support All of the 3 modes work in NAT environments.
- OpenVZ Support Tested on BandwagonHost.
- OpenWRT Support No dependencies, easy to build. Binary for ar71xx are included in the release.
- UDP QoS Bypass
- UDP Blocking Bypass
- OpenVPN TCP over TCP problem
- OpenVPN over ICMP
- UDP to ICMP tunnel
- UDP to TCP tunnel
- UDP over ICMP
- UDP over TCP
A Linux host (including desktop Linux, OpenWRT router, or Raspberry PI) with root access.
If you want to use it on MICRO$OFT Windows, you can use VMware or Hyper-V (both bridged mode and
NAT mode are supported).
- Fixed a bug which may cause bind port fail in log and the program to exit by itself.
Download binary release from https://github.com/wangyu-/udp2raw-tunnel/releases
Assume your UDP is blocked or being QoS-ed or just poorly supported. Assume your server ip is 22.214.171.124, you have a service listening on UDP port 7777.
Now, an encrypted raw tunnel has been established between client and server through TCP port 4096. Connecting to UDP port 3333 at the client side is equivalent to connecting to port 7777 on the server side. No UDP traffic will be exposed.
This program sends packets via raw socket. In FakeTCP mode, Linux kernel TCP packet processing has to be blocked by an iptables rule on both sides, otherwise, the kernel will automatically send RST for an unrecognized TCP packet and you will sustain from stability/performance problems. You can use -a option to let the program automatically add/delete iptables rule on start/exit. You can also use the
-g option to generate iptables rule and add it manually.
It is suggested to use
md5 to obtain maximum security. If you want to run the program on a router, you can try
simple, which can fool packet inspection by firewalls the most of the time, but it cannot protect you from serious attacks. Mode none is only for debugging purpose. It is not recommended to set the cipher-mode or auth-mode to none.
The FakeTCP mode does not behave 100% like a real TCP connection. ISPs may be able to distinguish the simulated tcp traffic from the real TCP traffic (though it’s costly). seq-mode can help you change the seq increase behavior slightly. If you experience connection problems, try to change the value.
iperf3 TCP via OpenVPN + udp2raw (iperf3 UDP mode is not used because of a bug mentioned in this issue: https://github.com/esnet/iperf/issues/296. Instead, we package the TCP traffic into UDP by OpenVPN to test the performance. Read Application for details.
- Client Vultr $2.5/monthly plan (single core 2.4GHz CPU, 512MB RAM, Tokyo, Japan)
- Server BandwagonHost $3.99/annually plan (single core 2.0GHz CPU, 128MB RAM, Los Angeles, USA)
raw_mode: fake TCP cipher_mode: xor auth_mode: simple
(reverse speed was simliar and not uploaded)
raw_mode: faketcp cipher_mode: aes128cbc auth_mode: md5
(reverse speed was similar and not uploaded)
tunneling any traffic via raw traffic by using udp2raw +openvpn
- bypasses UDP block/UDP QoS
- no TCP over TCP problem (TCP over TCP problem http://sites.inka.de/bigred/devel/tcp-tcp.html,https://community.openvpn.net/openvpn/ticket/2 )
- OpenVPN over ICMP also becomes a choice
more details at openvpn+udp2raw_guide
speed-up TCP connection via raw traffic by using udp2raw+kcptun
kcptun is a TCP connection speed-up program, it speeds-up TCP connection by using kcp protocol on-top of udp.by using udp2raw, you can use kcptun while UDP is QoSed or blocked. (kcptun, https://github.com/xtaci/kcptun)
speed-up TCP connection via raw traffic by using udp2raw+finalspeed
final speed is a TCP connection speed-up program similar to kcptun, it speeds-up TCP connection by using kcp protocol on-top of UDP or tcp.but its TCP mode doesn’t support OpenVZ, you can bypass this problem if you use udp2raw+finalspeed together, and ICMP mode also becomes available.
Copyright (c) 2017 Yu Wang (wangyucn at gmail.com)