I'm trying to find out why one connection type is faster than the other for a network links between China and the US. I'm running iPerf on clients at two diffent sites and was tasked to find out the connection speeds between the two sites. The results are odd because connecting through our IPSEC VPN we acheive speeds of .83Mbps and going through a Cisco VPN client speeds increase to 1.35Mpbs. The odd this is that all the hardware is the same between the two. Both VPN types connect through the same modems and ASA and they are connecting the same two workstations.
Can anyone here help explain what the cause for the speed discrepancy is? I don't know enough about VPN to begin to explain why. I've included some information here, but since I don't know much about this in the first place, if more is needed I'll include it as people ask. Any help will be appreciated. Diagram below.
_Mark
