I have speed problems with 2 cisco rv180 using VPN Site-to-Site. According to cisco specifications, the IPsec Throughput is 50 Mbps. I have done many tests using Iperf on both sides (NY ans SC) and all I have is 4 Mbps of IPsec Throughput. The internet speed for SC are: Download:50 Mbps Upload: 4 Mpbs, for NY: Download: 25 Mbps Upload: 25 Mbps. I changed the default encryption and authentication to 3DES and MD5 and mode to Aggressive, to see if it can improves but nothing. I also tested using PPTP client from my home (Download: 50 Mbps Upload: 8 Mbps) using Iperf, I have the almost the same speed of VPN Throughput than the IPsec 4 Mpbs.
All the options for the firewall are disabled, Jumbo frames are enabled and the right MTU sizes applied, all these have been done by a cisco engineer but I'm still have poor VPN performance.
I'm wondering if the internet speeds have something to do with the VPN's bad performance.
Thank you in advance,