A REALLY simple C program to simulate delay, packet loss and speed limit between 2 Linux boxes. Good for performing internet program testing in LAN.

• Use UDP between hosts.
• Create point-to-point tunnel with tun devices.
• Let me think...

Edit Makefile , change the above lines.

Then just

make
make install

Just take a look at example.conf and guess... Yes, it's in json.

• "RemoteAddress" and "RemotePort" indicates the peer side socket address. If these 2 entries are ommited, the program will be running in passive mode which means it will use the source address/port of the first packet it receives as the peer side address/port, and it will discard all outgoing packets before this.

• "LocalPort" indicates the local socket port, "0.0.0.0" is always used.

• "TunnelLocalAddr" and "TunnelPeerAddr" indicates the IP addresses would be configured to the tun device after it is created.

• "DropRate" indicates packet loss probability, value: [0-1]

• "Rate" indicates the speed limit. In BYTEs per second.

• "Delay" indicates the time delay of each packet, value in ms(millisecond). Note: You need erally big RAM if you configred a very big delay in very big Bps.

• "Loss" indicates packet loss rate.

NOTE: All configures are working while SENDING packets! Receiving packet procedure is not controlled at all! I have told you!

• Host1 (Passive side) configure file:

{
	"LocalPort"			:	60000,
	"TunnelLocalAddr"	:	"172.16.111.1",
	"TunnelPeerAddr"	:	"172.16.111.2",

	"Loss"				:	0.05,
	"Rate"				:	10000000,
	"Delay"				:	100
}

You type:

wormhole -c your_configure_file

• Host2 (Active side) configure file:

{
  "RemoteAddress" : "IP_ADDRESS_OF_PASSIVE_SIDE",
  "RemotePort" : 60000,
	"LocalPort"			:	60000,
	"TunnelLocalAddr"	:	"172.16.111.2",
	"TunnelPeerAddr"	:	"172.16.111.1",

	"Loss"				:	0.05,
	"Rate"				:	10000000,
	"Delay"				:	100
}

You type:

wormhole -c your_configure_file

OK, you can type

ping 172.16.111.2

at Host1 to check if it's OK.

Have FUN!