Most option names are the same as those used in json config files: server.json and local.json. Please check validate_xxx_options func definition of the service script and kcptun's own documentation for supported options and expected value types. And a sample config file is also provided for reference.
A kcptun config file can contain two types of config section: server and client, one of which represents a server or client instance. A server section can contain one or more options in Common options and Server options. And a client section can contain one or more options in Common options and Client options.
Every section has a disabled option to temporarily turn off the instance.
| Name | Type | Option | Description |
|---|---|---|---|
| disabled | boolean | disable current config section when set to 1 (default: 0) | |
| key | string | --key | pre-shared secret between client and server (default: "it's a secrect") |
| crypt | enum | --crypt | aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none (default: "aes") |
| mode | enum | --mode | profiles: fast3, fast2, fast, normal, manual (default: "fast") |
| mtu | integer | --mtu | set maximum transmission unit for UDP packets (default: 1350) |
| sndwnd | integer | --sndwnd | set send window size(num of packets) (default: 1024 for server, 128 for client) |
| rcvwnd | integer | --rcvwnd | set receive window size(num of packets) (default: 1024 for server, 512 for client) |
| datashard | integer | --datashard, --ds | set reed-solomon erasure coding - datashard (default: 10) |
| parityshard | integer | --parityshard, --ps | set reed-solomon erasure coding - parityshard (default: 3) |
| dscp | integer | --dscp | set DSCP(6bit) (default: 0) |
| nocomp | boolean | --nocomp | disable compression |
| sockbuf | integer | --sockbuf | per-socket buffer in bytes (default: 4194304) |
| smuxver | integer | --smuxver | specify smux version, available 1,2 (default: 1) |
| smuxbuf | integer | --smuxbuf | the overall de-mux buffer in bytes (default: 4194304) |
| streambuf | integer | --streambuf | per stream receive buffer in bytes, for smux v2+ (default: 2097152) |
| keepalive | integer | --keepalive | seconds between heartbeats (default: 10) |
| snmplog | string | --snmplog | collect snmp to file, aware of timeformat in golang, like: ./snmp-20060102.log |
| snmpperiod | integer | --snmpperiod | snmp collect period, in seconds (default: 60) |
| tcp | boolean | --tcp | to emulate a TCP connection(linux), need root privilege |
| quiet | boolean | --quiet | suppress the 'stream open/close' messages |
| gogc | integer | set GOGC environment variable, see Memory Control. | |
| syslog | boolean | redirect logs to syslog when set to 1, implemented by procd. (default: 0) | |
| user | string | run as another user, implemented by procd. |
| Name | Type | Option | Description |
|---|---|---|---|
| listen | port number | --listen, -l | kcp server listen port (default: ":29900") |
| target | host | --target, -t | target server address (default: "127.0.0.1:12948") |
| target_port | port number | --target, -t | target server port (default: "127.0.0.1:12948") |
| pprof | boolean | --pprof | start profiling server on :6060 |
| Name | Type | Option | Description |
|---|---|---|---|
| bind_address | IP address | --localaddr, -l | local listen address (default: ":12948") |
| local_port | port number | --localaddr, -l | local listen port (default: ":12948") |
| server | host | --remoteaddr, -r | kcp server address (default: "vps:29900") |
| server_port | port number | --remoteaddr, -r | kcp server port (default: "vps:29900") |
| conn | integer | --conn | set num of UDP connections to server (default: 1) |
| autoexpire | integer | --autoexpire | set auto expiration time(in seconds) for a single UDP connection, 0 to disable (default: 0) |
| scavengettl | integer | --scavengettl | set how long an expired connection can live(in sec), -1 to disable (default: 600) |