i have a requirement to test a firewall product. whenever there is traffic across the firewall i need to send some generic icmp error messages corresponding to that traffic(say source quench packet). the idea is to test whether firewall can handle all types of traffic.. there is also a requirement to send replay packets corresponding to some tcp traffic.. do u have any suggestions or tools for doing this.. thanks.. Syed SK - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html