inspect outgoing packets and delay them, with jpcap

Question

I can read the content of the packets, but I don't know how to delay them.

(I am not fluent in English.)

I think you mean relay them? similar to what fiddler does? http://fiddler2.com/ — T McKeown, Dec 26 '13 at 16:29
yes like fiddler, but how can coding that?? i want to automatize some function(catching packets, sleep(delay) them, and release them) — user3137176, Dec 26 '13 at 16:33

score 3 · Answer 1 · answered Dec 26 '13 at 16:32

3

Packet capture doesn't allow you to prevent a packet being sent. It is for monitoring only. If you want to delay a packet you need a device e.g. a multi-homed PC, to sit between your system and rest of the network. This can be used to capture on one network interface and copy packets to a second interface with what ever delay you want.

If you want to do this in software you can create a TCP proxy server and have your software connect to it.

answered Dec 26 '13 at 16:32

Peter Lawrey

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@user3137176 A TCP proxy server just listen on one port and connects to a hostname/port of your choice when a new connection comes in. You can have two threads, one copying out and the other copying back in. You can also add a delay, either fixed or based on a bandwidth limitation. – Peter Lawrey Dec 26 '13 at 17:56

inspect outgoing packets and delay them, with jpcap

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