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@@ -34,37 +34,43 @@ static void print_help()
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printf(" --tun-dev <number> sepcify tun device name, for example: tun10, default: a random name such as tun987\n");
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printf(" -f,--fec x:y forward error correction, send y redundant packets for every x packets\n");
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printf(" --timeout <number> how long could a packet be held in queue before doing fec, unit: ms, default: 8ms\n");
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- printf(" --mode <number> fec-mode,available values: 0, 1; 0 cost less bandwidth, 1 cost less latency;default: 0)\n");
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printf(" --report <number> turn on send/recv report, and set a period for reporting, unit: s\n");
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printf(" --keep-reconnect re-connect after lost connection,only for client. \n");
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printf("advanced options:\n");
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+ printf(" --mode <number> fec-mode,available values: 0,1; mode 0(default) costs less bandwidth,no mtu problem.\n");
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+ printf(" mode 1 usually introduces less latency, but you have to care about mtu.\n");
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printf(" --mtu <number> mtu for fec. for mode 0, the program will split packet to segment smaller than mtu.\n");
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printf(" for mode 1, no packet will be split, the program just check if the mtu is exceed.\n");
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printf(" default value: 1250\n");
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printf(" -j,--jitter <number> simulated jitter. randomly delay first packet for 0~<number> ms, default value: 0.\n");
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printf(" do not use if you dont know what it means.\n");
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- printf(" -i,--interval <number> scatter each fec group to a interval of <number> ms, to protect burst packet loss.\n");
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+ printf(" -i,--interval <number> scatter each fec group to a interval of <number> ms, to defend burst packet loss.\n");
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printf(" default value: 0. do not use if you dont know what it means.\n");
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+ printf(" -f,--fec x1:y1,x2:y2,.. similiar to -f/--fec above,fine-grained fec parameters,may help save bandwidth.\n");
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+ printf(" example: \"-f 1:3,2:4,10:6,20:10\". check repo for details\n");
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printf(" --random-drop <number> simulate packet loss, unit: 0.01%%. default value: 0\n");
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printf(" --disable-obscure <number> disable obscure, to save a bit bandwidth and cpu\n");
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printf(" --disable-checksum <number> disable checksum to save a bit bandwdith and cpu\n");
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- printf(" --disable-xor <number> disable xor encryption to save a bit cpu\n");
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+ //printf(" --disable-xor <number> disable xor\n");
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+ printf(" --persist-tun <number> make the tun device persistent, so that it wont be deleted after exited.\n");
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+ printf(" --mssfix <number> do mssfix for tcp connection, use 0 to disable. default value: 1250\n");
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printf("developer options:\n");
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printf(" --tun-mtu <number> mtu of the tun interface,most time you shouldnt change this\n");
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- printf(" --mssfix <number> do mssfix for tcp connection, use 0 to disable. default value: 1250\n");
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- printf(" -i,--interval imin:imax similiar to -i above, but scatter randomly between imin and imax\n");
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+ printf(" --manual-set-tun <number> tell tinyfecvpn to not setup the tun device automatically(e.g. assign ip address),\n");
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+ printf(" so that you can do it manually later\n");
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printf(" --fifo <string> use a fifo(named pipe) for sending commands to the running program, so that you\n");
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printf(" can change fec encode parameters dynamically, check readme.md in repository for\n");
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printf(" supported commands.\n");
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printf(" -j ,--jitter jmin:jmax similiar to -j above, but create jitter randomly between jmin and jmax\n");
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printf(" -i,--interval imin:imax similiar to -i above, but scatter randomly between imin and imax\n");
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- printf(" -q,--queue-len <number> max fec queue len, only for mode 0\n");
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+ printf(" -q,--queue-len <number> fec queue len, only for mode 0, fec will be performed immediately after queue is full.\n");
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+ printf(" default value: 200. \n");
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printf(" --decode-buf <number> size of buffer of fec decoder,u nit: packet, default: 2000\n");
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- printf(" --fix-latency <number> try to stabilize latency, only for mode 0\n");
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- printf(" --delay-capacity <number> max number of delayed packets\n");
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+// printf(" --fix-latency <number> try to stabilize latency, only for mode 0\n");
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+ printf(" --delay-capacity <number> max number of delayed packets, 0 means unlimited, default: 0\n");
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printf(" --disable-fec <number> completely disable fec, turn the program into a normal udp tunnel\n");
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printf(" --sock-buf <number> buf size for socket, >=10 and <=10240, unit: kbyte, default: 1024\n");
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printf("log and help options:\n");
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wangyu-