Hi, when I start an application (e.g. iperf) after executing "modprobe hipmod" and "hipconf ...", only a base exchange is executed: I1->R1->I2->R2. After that 4 or 5 ESP packets are delivered, but nothing else. A connection will only be established on the second connection attempt (e.g. by restarting iperf). Is this normal behaviour? Thanks Simon