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andrewding
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IPSEC VPN speed slow only in a single direction

Hi All,

- I have 2 sites, Site A and B and have IPSEC VPN setup between the 2 sites.

- Recently i noticed that there was a strange behavior whereby

Site A download file from Site B: 7mbps, upload 200kbps

Site B download file from Site A: 200kbps, upload 7mbps

- Now i have tried direct downloads from each site to internet and get upload and downloads at the same speed, 7mbps. These links are DIA lines and guarantee uploads and downloads. Have also asked service providers to check and they confirmed nothing wrong.

- I have also tried a SSLVPN to site B (no sslvpn to site a) and tried directly downloading and uploading files and am able to achieve the same 7mbps speed. So this rules out the possibility that there is a server limitation. 

- Have tried tweaking the tcp-mss and enable/disable the asic but all it did was just make it slower.

- Its really baffling, anyone faced this issue before? Am running version 5.6.9.

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