T70/M270 poor VPN troughput
I have two sites as described below
200/200Mbps wan link
M270 firewall, 12.5.1 firmware
1Gb/1Gb wan link
T70 firewall, 12.5.1 firmware
The sites are connected with BOVPN.
I'm transferring backup data between sites, but troughput is quite poor, 4Mbps.
Settings on both sites:
PFS enabled DH14
If I change Phase2 from ESP-AES128-GCM to ESP-AES-SHA1, I get roughly 180Mbps troughput, which is quite close to saturating the site A WAN connection.
We are planning to upgrade Site A WAN link to 500/500Mbps to increase our backup troughput.
The VPN troughput on T70 and M270 prochure is 740Mbps/1.6Gbps, on what settings is this kind of speeds achieved?
Is there anywhere comparison table for different algorithms speed vs security or what would be the recommended settings to achieve for ~400Mbps troughput ?