c udp chat testing

I am writing a udp chat application in c. I need to test if messages are received in an incorrect order. CAn anyone please tell me of a tool I can use to delay certain messages? also please tell me how to use it? thank you very much in advance! also I am using ubuntu x86_64 and OSX 10.6.4. A tool in either OS wi开发者_开发问答ll work

When I created a syslog server I needed to see if it was catching the messages. I used Wireshark from http://www.wireshark.org/ . This is a free tool that shows you all traffic passing your network cable. Even packages not intended for your computer.

Have fun...

If you need to verify this, you probably also don't want messages to disappear (or at least know if they do). UDP doesn't sound like what you want. Have a look at implementing this using TCP instead, you get this behaviour with the protocol.