junkwire

JunkWire

Function: Improve the usability of bad networks.

UDP disguises as TCP: reduces QoS after masquerading as TCP

Multiple servers can be configured, automatic disconnection, reconnection and server change, no upper layer awareness: heartbeat detection, sending 5 heartbeat packets per second. If all five heartbeat packets are lost, switch to the next server. It can be completed in 2 seconds.

Optional FEC forward error correction: 20 original packets plus 10 error correction packets can reduce the packet loss rate to one ten thousandth.

Interleaving coding: can evenly spread the packet loss concentrated in a short period of time to prevent both original packets and error correction packets from being lost.

Configuration method

Junkwire uses tun devices for data transmission, so first make sure that the operating environment supports tun devices. After running, a tun device called faketcp will be created. The IP address of this device can be configured through the configuration file. Generally, it can be written as 10.1.1.1, as long as it does not conflict with your local network environment. After running, a network device 10.1.1.2 will be virtualized.

Server configuration

First, configure the server DNAT to forward the packets of the corresponding port to junkwire for processing.

First enable ipv4 forwarding, add net.ipv4.ip_forward=1 to the /etc/sysctl.conf file and then run sysctl -p to make it take effect.

Add iptables rules iptables -t nat -A PREROUTING -i network card name -d network card IP -p tcp --dport 17021 (client connection port) -j DNAT --to-destination 10.1.1.2:17021

Wireguard configuration example, change according to actual situation

    [Interface]
    Address = 10.200.201.1/24
    ListenPort = 21007
    #ListenPort = 12273
    PrivateKey = xxx
    MTU = 1340

    [Peer]
    PublicKey = xxx
    AllowedIPs = 10.200.201.2/32
    PersistentKeepalive = 25

Server-side junkwire configuration file example

    {
    "mode": "server",
    "queue":500,
    "server": {
        "tun": {
            "deviceIP": "10.1.1.1",
            "port": "17021",
            "srcIP": "10.1.1.2"
        },
        "socket": {
            "dstIP": "127.0.0.1",
            "dstPort": "21007"
        }
    },
    "fec": {
        "enable":false, //是否启用fec
        "seg": 20, //几个数据包
        "parity": 20, //几个纠错包
        "duration":0, //交织编码的时长
	    "stageTimeout":8, //桶没装满的话最长等多久
	    "cap":500, 
	    "row":1000
    }
    }

Start junkwire ./junkwire -c configuration file

Start wireguard wg-quick up wg0

Client configuration

The client needs to allow the data of virtual device 10.1.1.2 to be sent smoothly, and snat is required.

iptables -t nat -A POSTROUTING -s 10.1.1.2 -p tcp -o eth0 -j SNAT --to-source local network card ip

Routing configuration to prevent export IP from being brought into wireguard

ip route add server ip/32 via local gateway dev eth0

wireguard configuration

 [Interface]
Address = 10.200.201.2/24
PrivateKey = yJAu/oI+Oo/Mhswqbm3I/3PWYi+WSxX7JpTQ8IoQqWU=
MTU = 1340

[Peer]
PublicKey = 5/SgVv3hc3f5Fa/XoLo4isBzyrwwATs5sfQv7oWhiTM=
Endpoint = 127.0.0.1:21007
AllowedIPs = 0.0.0.0/1,128.0.0.0/1
PersistentKeepalive = 25

junkwire configuration example

 {
    "mode": "client",
    "queue":500,
    "client": {
        "tun": {
            "deviceIP": "10.1.1.1",
            "port": "8978",
            "srcIP": "10.1.1.2",
            "peers": [
			{
			    "ip":"线路1",
			    "port":"50018"
			},
			{
			    "ip":"线路2",
			    "port":"17021"
			},
			{
			    "ip":"线路3",
			    "port":"17021"
			}
            ]
        },
        "socket": {
            "listenPort": "21007"
        }
    },
    "fec": {
        "enable":false,
        "seg": 20,
        "parity": 10,
        "stageTimeout": 8,
        "duration": 0,
        "cap": 500,
        "row": 1000
    }
}

Start junkwire ./junkwire -c configuration file

Start wireguard wg-quick up wg0