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@ -24,34 +24,10 @@ Linux host (including desktop Linux,Android phone/tablet,OpenWRT router,or Raspb
For Windows and MacOS users, use the udp2raw in [this repo](https://github.com/wangyu-/udp2raw-multiplatform). For Windows and MacOS users, use the udp2raw in [this repo](https://github.com/wangyu-/udp2raw-multiplatform).
# Features # Features
### Send/Receive UDP Packets with ICMP/FakeTCP/UDP headers * 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. * Simulated TCP with Real-time/Out-of-Order Delivery
* Encryption, Anti-Replay
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 encryption, anti-replay, or connection stalization). * Failure Dectection & Stablization (Connection Recovery)
### 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 congestion control or re-transmission. So there wont be any TCP over TCP problem when using OpenVPN.
### Encryption, Anti-Replay
* Encrypt your traffic with AES-128-CBC.
* Protect data integrity by HMAC-SHA1 (or weaker MD5/CRC32).
* Defense replay attack with an anti-replay window, smiliar to IPSec and OpenVPN.
### Failure Dectection & Stablization (Connection Recovery)
Conection failures are detected by heartbeats. If timed-out, client will automatically change port number and reconnect. If reconnection is successful, the previous connection will be recovered, and all existing UDP conversations will stay vaild.
For example, if you use udp2raw + OpenVPN, OpenVPN won't lose connection after any reconnect, **even if network cable is re-plugged or WiFi access point is changed**.
### Other Features
* **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 VPS.
* **Easy to Build** No dependencies.To cross-compile udp2raw,all you need to do is just to download a toolchain,modify makefile to point at the toolchain,run `make cross` then everything is done.(Note:Pre-compiled binaries for Desktop,RaspberryPi,Android,some Openwrt Routers are already included in [Releases](https://github.com/wangyu-/udp2raw-tunnel/releases))
### Keywords ### Keywords
`Bypass 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` `Bypass 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`
@ -219,63 +195,6 @@ raw_mode: faketcp cipher_mode: aes128cbc  auth_mode: md5
(reverse speed was simliar and not uploaded) (reverse speed was simliar and not uploaded)
# Application
## Tunneling any traffic via raw traffic by using udp2raw +openvpn
![image_vpn](images/udp2rawopenvpn.PNG)
1. Bypasses UDP block/UDP QOS
2. 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 )
3. OpenVpn over ICMP also becomes a choice
4. Supports almost any UDP-based VPN
More details at [openvpn+udp2raw_guide](https://github.com/wangyu-/udp2raw-tunnel/wiki/udp2raw-openvpn-config-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
finalspeed is a tcp connection speed-up program similiar to kcptun,it speeds-up tcp connection by using kcp protocol on-top of udp or tcp.but its tcp mode doesnt support openvz,you can bypass this problem if you use udp2raw+finalspeed together,and icmp mode also becomes avaliable.
# How to build
read [build_guide](/doc/build_guide.md)
# Other
### Easier installation on ArchLinux
```
yaourt -S udp2raw-tunnel # or
pacaur -S udp2raw-tunnel
```
# Related work
### kcptun-raw
udp2raw was inspired by kcptun-raw,which modified kcptun to support tcp mode.
https://github.com/Chion82/kcptun-raw
### relayRawSocket
kcptun-raw was inspired by relayRawSocket. A simple udp to raw tunnel,wrote in python
https://github.com/linhua55/some_kcptun_tools/tree/master/relayRawSocket
### kcpraw
another project of kcptun with tcp mode
https://github.com/ccsexyz/kcpraw
### icmptunnel
Transparently tunnel your IP traffic through ICMP echo and reply packets.
https://github.com/DhavalKapil/icmptunnel
### Tcp Minion
Tcp Minion is a project which modifid the code of tcp stack in kernel,and implemented real-time out-order udp packet delivery through this modified tcp stack.I failed to find the implementation,but there are some papers avaliable:
https://arxiv.org/abs/1103.0463
http://korz.cs.yale.edu/2009/tng/papers/pfldnet10.pdf
https://pdfs.semanticscholar.org/9e6f/e2306f4385b4eb5416d1fcab16e9361d6ba3.pdf
# wiki # wiki
Check wiki for more info: Check wiki for more info: