I have a server A running pptpd on CentOS 6.2. And I also setup ip_forward and nat on server A so that clients can access internet via their vpn gateway server A. When a client B(win7 x86_64) connects to pptpd server A and downloading an iso image from server C, the speed is only 10-20KB/s, while the same client downloads same image from server A, speed can be up to 400KB/s, and server A download same image from server C speed can up to 9MB/s. I've tried to increase tcp r/wmem from /proc but seems no luck. Is there any way to tune the speed?
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