On a multi-tier application, I need to simulate various TCP/IP errors to test some reconnection code. Does anyone know of any tools (Windows based) I can use for this purpose? Thanks.
Try netwox (formerly lcrzoex.) If it won't do it, it can't be done. It contains >200 tools.
Scapy allows you to control every aspect of the packets, and randomly modify ("fuzz") the ones you don't want to control. If you're a command-line kind of guy, it's a great tool.
Clumsy is a good tool for TCP error simulation on Windows. It can simulate (copy-pasted from link above):
- Lag, hold the packets for a short period of time to emulate network lagging.
- Drop, randomly discard packets.
- Throttle, block traffic for a given time frame, then send them in a single batch.
- Duplicate, send cloned packets right after to the original one.
- Out of order, re-arrange the order of packets.
- Tamper, nudge bits of packet's content.
No tools that I'm aware of, but most of TCP errors can be emulated by a custom LSP filter. This article can get you started writing one
On FreeBSD, the best tool, by far, is dummynet, "a tool originally designed for testing networking protocols, and since then used for a variety of applications including bandwidth management. It simulates/enforces queue and bandwidth limitations, delays, packet losses, and multipath effects."
On Linux, you will have to use netem. (It seems there is now a port of dummynet but I never tried it.)
More details (in French) in my article.
来源：https://stackoverflow.com/questions/2121458/how-can-i-simulate-tcp-ip-errors