It happens when a client and a server are connected with a TCP connection (telnet or rlogin, for example). If a third machine sends to the server a forged packet with rights sequence and ack numbers, the server reply the echo with seq=last ack+1 and ack=last seq+1. But this packet should be rejected by the client (client's seq<server's ack) and is not (the echo is displayed). Am I wrong? I noticed this on 2.0 kernels, but not on my 2.2.10. And it happens again on a 2.2.12. I'll try to have tcpdump traces if someone asks. - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to [EMAIL PROTECTED]
